Low Degree Of Deformation Research Articles

Cytocompatibility evaluation and surface characterization of TiNi deformed by high-pressure torsion

Effect of high-pressure torsion (HPT) deformation on biocompatibility and surface chemistry of TiNi was systematically investigated. Ti–50mol% Ni was subjected to HPT straining for different numbers of turns, N=0.25, 0.5, 1, 5 and 10 at a rotation speed of 1rpm. X-ray photoelectron spectroscopy observations after 7days of cell culture revealed the changes in the surface oxide composition, enrichment of Ti and detection of nitrogen derived from organic molecules in the culture medium. Plating efficiency of L929 cells was slightly increased by HPT deformation though no significant difference was observed. Albumin adsorption was higher in HPT-deformed samples, while vitronectin adsorption was peaked at N=1. HPT deformation was also found to effectively suppress the Ni ion release from the TiNi samples into the cell culture medium even after the low degree of deformation at N=0.25.

Additively manufactured cellular structures: Impact of microstructure and local strains on the monotonic and cyclic behavior under uniaxial and bending load

In order to meet the demand for optimized light-weight parts, the development of load adapted structures has begun to play a key role in today's research. Promising candidates are complex cellular structures, which can be adapted to the loading conditions by use of Additive Manufacturing techniques. The current study addresses the mechanical behavior of open cellular structures produced by Selective Laser Melting. Samples of Ti–6Al–4V were processed, heat-treated and tested under monotonic and cyclic loading applying both uniaxial and bending loads. To reveal microstructure – mechanical property – relationships an in situ approach using electron back scatter diffraction and digital image correlation was applied.The results clarify the impact of a post-SLM heat treatment on the mechanical performance of cellular structures made from Ti–6Al–4V. Local strains determined by DIC reveal structure weaknesses already at low degrees of deformation and at an early stage of lifetime. The in situ approach helps in understanding the mechanical behavior and allows for local adaptation of the cell design in order to obtain improved load adapted structures.

Effect of cold working and sandblasting on the microhardness, tensile strength and corrosion resistance of AISI 316L stainless steel

The aim of this work is to investigate the effect of cold working and sandblasting on the microhardness, tensile strength and corrosion rate of AISI 316L stainless steel. The specimens were deformed from 17% to 47% and sandblasted for 20 min using SiC particles with a diameter of 500–700 μm and an air flow with 0.6–0.7 MPa pressure. The microhardness distribution and tensile test were conducted and a measurement on the corrosion current density was done to determine the corrosion rate of the specimens. The result shows that the cold working enhances the bulk microhardness, tensile and yield strength of the specimen by the degree of deformation applied in the treatment. The sandblasting treatment increases the microhardness only at the surface of the specimen without or with a low degree of deformation. In addition, the sandblasting enhances the surface roughness. The corrosion resistance is improved by cold working, especially for the highly deformed specimen. However the follow-up sandblasting treatment reduces the corrosion resistance. In conclusion, the cold working is prominent to be used for improving the mechanical properties and corrosion resistance of AISI 316L stainless steel. Meanwhile, the sandblasting subjected to the cold worked steel is only useful for surface texturing instead of improving the mechanical properties and corrosion resistance.

Processing of Microalloyed Steels by CSP Process

Microalloyed steels containing Nb and V have been processed by CSP route. The process involved continuous casting of slabs into 50 mm thickness followed by their homogenization at 1100°C during continuous movement in a tunnel furnace. Subsequently, the slabs are hot rolled in a six stand rolling mill. The effects of deformation in the initial passes and finish rolling temperature on the microstructure and mechanical properties of the hot-rolled strips have been examined. The results indicate equiaxed grain morphology of the ferrite phase coexisting with globular carbides. The grain size of the ferrite phase was observed to vary from 4 to 8 µm both in the longitudinal and transverse directions of strips. The hot-rolled strips showed an average yield strength (YS) value of 495 MPa, UTS value of 596 MPa, YS/UTS ratio of 0.83, and percentage elongation of 38% with no surface cracks. However, relatively lower strength coupled with surface cracks were observed on the steel strips processed with low degree of deformation in the initial passes followed by low finish rolling temperature and accelerated cooling. The reasons for microstructural refinement and origin of surface cracks on the hot-rolled strips in CSP process are discussed.

Biosensor-Based Evaluation of Liposomal Behavior in the Target Binding Process

In this study we evaluated the quartz crystal microbalance (QCM) as a biosensor for a real-time investigation of liposomal binding, under dynamic flow conditions, onto target proteins immobilized at the sensor. The mass-sensitive frequency changes of quartz sensors allow for a quantification of the liposomal binding process. Furthermore, simultaneous damping analysis gives an insight into liposomal behavior, such as the degree of liposomal deformation or spreading at the target surface. In this study a series of liposomes was evaluated, differing in the kind and concentration of ligands interacting with appropriate target proteins. It became evident that an increase in homing device concentration accelerated deformation and flattening of liposomes, triggering a fusion process. Furthermore, liposomal deformation corresponded with the binding affinity of target molecules, comparing biotin/avidin with E-selectin/ligand interactions. Deformation could be emphasized using dioleoylphosphatidylethanolamine (DOPE) as a fusiogenic membrane component, while sterical stabilization by polyethylenglycol (PEG-PE) appeared in a low degree of deformation. Consequently, the online detection of liposomal target binding by QCM is an excellent facility to control and predict the liposomal behavior at the target site for increasing therapeutic potency.

Modeling of the Electric Field-Induced Birefringence of Vesicles

Electric birefringence of unilamellar lipid vesicles, elongated in the direction of the applied field E, is modeled for a low degree of deformation to a prolate ellipsoid of the original spherical shells. The existing theory for water-in-oil microemulsion is adapted, and the intrinsic birefringence of the lipid membrane and the form birefringence of the aqueous inner compartment of the vesicle are taken into account. Deformation under both constant surface area and constant volume conditions are considered, but thinning of the bilayer at the polar caps and rotational/orientational effects are neglected. For illustration of the utility of the theoretical results, the extent of elongation of large unilamellar vesicles (LUV), prepared from the zwitterionic DOPC (dioleoylphosphatidylcholine), is calculated based on available experimentally measured induced birefringence data. With the use of reasonable values for the refractive indexes of the membrane, the axial ratio P of the deformed vesicle is found to be ...

Influence of melt drawing on the morphology of one‐ and two‐step processed LDPE/thermoplastic starch blends

AbstractIn this study the morphology of LDPE/TPS blends prepared by a one‐step extrusion process is compared to that obtained by reprocessing of the original blends. The influence of composition and melt drawing is examined. A novel methodology based on the form factor of the dispersed particle was used to estimate the equivalent spherical particle size of dispersed thermoplastic starch (TPS). This approach allows for the quantitative comparison of average dispersed phase particles regardless of their shape. Blends prepared in the one‐step extrusion process show increased levels of anisotropy as a consequence of a combination of coalescence and particle deformation during melt drawing. Reprocessed materials demonstrate morphologies that are highly stable to a wide range of hot stretch ratio conditions. The TPS particles of reprocessed blends show no coalescence and a low degree of deformation. This phenomenon is explained by plasticizer evaporation resulting from the second processing step. The TPS is transformed from a highly deformable phase to one resembling a partially cross‐linked material. These data indicate that the one‐step processing of LDPE/TPS blends can be used to generate a wide range of highly elongated morphological structures. A two‐step approach, analogous to typical compounding and shaping operations and involving controlled glycerol removal in the second step can be used to prepare a wide range of highly stable, more isotropic, dispersed particle morphologies. © 2003 Wiley Periodicals, Inc. Adv Polym Techn 22: 297–305, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/adv.10057

Mineral Chemistry and Pressure–Temperature Evolution of Two Contrasting High-pressure–Low-temperature Belts in the Chonos Archipelago, Southern Chile

The Chonos Metamorphic Complex forms part of a belt of low-grade metamorphic rocks in the Chilean Coastal Cordillera that are interpreted as Palaeozoic–Mesozoic accretionary complexes. It comprises metapsammopelitic schists, metabasites and meta-ironstones occurring in two contrasting units. Special attention during microprobe study of key samples was given to the chemical zonation of minerals. Subsequently, conventional geothermobarometry and that using thermodynamic calculations were applied. The Eastern belt comprises rocks that are metamorphosed to pumpellyite–actinolite facies conditions and show a low degree of deformation with well-preserved sedimentary and igneous structures. Maximum P–T conditions were around 5·5 kbar and 250–280°C. The rocks of the Western belt are characterized by a transition between greenschist and albite–epidote–amphibolite facies metamorphism and show a penetrative tectonic transposition foliation S2 formed close to the pressure maximum. Maximum P–T conditions vary around 8–10 kbar and 380–500°C overstepping the stilpnomelane + phengite stability. High pressures in this belt are confirmed by regionally distributed phengites with high Si contents up to 3·5 Si per formula unit. Regional distribution of maximum temperatures is reflected by the composition of actinolitic hornblendes within the metabasites. In a garnet-bearing metabasite of the Western belt, oscillatory growth zoning of garnet was observed. The composition of corresponding mineral inclusions suggests that a prograde P–T path during garnet growth evolved from 7·5 kbar and 375°C to about 9·4 kbar and 500°C. Late garnet grew synkinematically with penetrative deformation. The retrograde P–T path in the rocks of the Western belt is constrained by the composition of mainly late strain-free minerals and involves slight cooling during decompression. Both belts are part of a subduction system. The apparent P–T gap between the belts is due to their juxtaposition during exhumation. The Eastern belt constitutes the transition towards the backstop system of the accretionary prism that is represented by the Western belt, whereas the absence of very low grade rocks west of the Western belt is attributed to tectonic erosion, which was possibly caused by subduction of a ridge.

Rolling texture in the intermetallic compound Ni76Al24(B)

The development of cold rolling texture in the intermetallic compound Ni3Al(B) has been investigated as a function of rolling reduction, using the conventional pole figure as well as the orientation distribution functions (ODF) method. The textures at low degrees of deformation have been found to be similar to the rolling texture of pure Ni cold rolled to similar levels. With increasing degree of deformation, the texture in Ni3Al(B) changes to alloy type at reductions greater than 45%. This texture is characterized by the presence of a remarkably strong rotated Goss component over and above the Brass (Bs) component. Transmission electron microscopy of thin foils of the material cold rolled by 65% and more shows evidence of twinning. X-ray diffraction analysis indicates a structural change in the material from L12 to DO22 with the progress of cold work. An attempt has been made to explain the texture development in terms of this structural transformation.

Use of ultrasound imaging and fluoroscopic imaging to study gastric retention of enzyme-digestible hydrogels

Ultrasound and fluoroscopic imaging techniques were used to monitor the gastric retention of enzyme-digestible hydrogels in the canine stomach. When water was present in the stomach, ultrasound imaging was very effective in monitoring the position of the hydrogel in the stomach, solvent penetration into the gel, and the gastric tissue-gel interactions during peristalsis. Rubbery or fully swollen hydrogels appeared as sonolucent objects with ultrasound imaging. Partially swollen hydrogels displayed a sonolucent outer layer due to solvent penetration and a centrally located bright echo resulting from the acoustic impedance mismatch at the glassy/ rubbery interface. The degree of gastric tissue-gel interactions during peristalsis was inversely related to the extent of lumenal distention with water. The effectiveness of peristaltic contractions in driving the hydrogel toward the pyloric sphincter increased as the water was emptied from the stomach. In the absence of water, imaging of the gel with ultrasound became difficult. For this reason, gels were loaded with diatrizoate meglumine/sodium diatrizoate to visualize in real-time using fluoroscopic imaging. Fluoroscopic imaging allowed only indirect assessment of the hydrogel movement during peristalsis and the degree of hydrogel swelling. The gastric retention of the hydrogel under fasted conditions was influenced by the degree of gel deformation in response to peristaltic contractions. Hydrogels with a low degree of deformation during peristalsis showed long gastric retention times. The utilization of ultrasound imaging and fluoroscopic imaging for monitoring dynamic events in the stomach provided information on hydrogel properties which are important to gastric retention. The use of these imaging techniques in the development of long-term oral drug delivery systems is described.

溶接残留応力下における疲労き裂伝ぱ挙動に及ぼす塑性変形効果

Crack closure behavior in fatigue crack propagation process is induced by plastic deformation near crack. In the present paper, the effect of plastic deformation on fatigue crack closure in low strength material and its welded joint was studied. The results obtained are as follows. Crack closure was caused by plastic deformation near crack surface. Generally, the crack opening ratio in high yield strength material was higher than that in low yield one. This tendency results from a low degree of deformation near crack surface. In addition, in welded joint, the crack propagation rate was higher than the mother metal, though the crack opening ratio was almost 1 by the effect of residual stress. This was explained by the effect of restraint for plastic deformation, which was induced by the existence of compressive stress field ahead of crack.

Structure and thermoplastic properties of polyamides

A study has been made of the influence of the molecular structure of polyamidoimides on the character of their molecular aggregation and their thermoplastic properties. Under low degrees of deformation the thermoelastic behaviour of the polymers obeys the classic equations. If the deformation is increased a transition through the yield point and plastic flow are observed. Experimental results are discussed from the point of view of chain structure and possible mesophase formation.

Petrogenesis of a Proterozoic nickel-sulfide-komatiite association; the Katiniq Sill, Ungava, Quebec

Other| April 01, 1982 Petrogenesis of a Proterozoic nickel-sulfide-komatiite association; the Katiniq Sill, Ungava, Quebec Stephen J. Barnes; Stephen J. Barnes Univ. Toronto, Dep. Geol., Toronto, ON, Canada Search for other works by this author on: GSW Google Scholar C. J. A. Coats; C. J. A. Coats Search for other works by this author on: GSW Google Scholar Anthony J. Naldrett Anthony J. Naldrett Search for other works by this author on: GSW Google Scholar Author and Article Information Stephen J. Barnes Univ. Toronto, Dep. Geol., Toronto, ON, Canada C. J. A. Coats Anthony J. Naldrett Publisher: Society of Economic Geologists First Online: 02 Mar 2017 Online ISSN: 1554-0774 Print ISSN: 0361-0128 GeoRef, Copyright 2006, American Geological Institute. Abstract, Copyright, Society of Economic Geologists Economic Geology (1982) 77 (2): 413–429. https://doi.org/10.2113/econgeo.77.2.413 Article history First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Stephen J. Barnes, C. J. A. Coats, Anthony J. Naldrett; Petrogenesis of a Proterozoic nickel-sulfide-komatiite association; the Katiniq Sill, Ungava, Quebec. Economic Geology 1982;; 77 (2): 413–429. doi: https://doi.org/10.2113/econgeo.77.2.413 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyEconomic Geology Search Advanced Search Abstract The Katiniq nickel deposit is an example of an association of magmatic Fe-Ni-Cu sulfides with komatiitic volcanism, in the Cape Smith-Wakeham Bay foldbelt in northern Quebec. The deposit is unusual because of its Proterozoic age in contrast to the Archcan ages of most other deposits of this type, and is of interest in view of the relatively low degree of deformation and metamorphism to which it has been subjected.Nickel sulfide mineralization occurs within the Katiniq sill, an olivine-rich subvolcanic intrusive lens up to 150 m thick. The sill consists of a number of olivine-rich intrusive units, each characterized by a concentric zonation in olivine content from a maximum in the core to minimums at the margins. This zonation is attributed to a mechanism whereby the sill behaved as an open channel, forming part of a subvolcanic feeder system. Magma flowing through the channel carried a progressively higher proportion of intratelluric olivine phenocrysts with time, while crystallization of earlier, less olivine-rich material occurred inward from the margins. Flowage eventually became choked off as the channel became clogged with olivine.Sulfide mineralization occurs dominantly at or close to the base of the sill and shows a marked correspondence with irregularities in the footwall topography. Typical intersections consist of massive ore at the base, succeeded upward by net-textured ore and disseminated sulfides. These observations indicate a primary magmatic origin for the sulfides.The average composition of the liquid portion of the magma-olivine suspension intruded into the sill was that of a pyroxenitic komatiite, having an MgO content of about 19 percent. The chemical variations within the volcanic rocks overlying the sill are consistent with the derivation of these rocks from a liquid of this composition by low-pressure fractionation of olivine.The mean Ni/Cu ratio of the Katiniq sulfides is 4.3, close to that predicted for a sulfide liquid in equilibrium with a magma of the above composition. Massive sulfides may show significantly higher Ni/Cu ratios than net-textured and disseminated types, a discrepancy which is attributed to hydrothermal remobilization of Cu.Concentrations of precious metals, particularly Pt and Pd, are unusually high in the Katiniq sulfides; this may be partially due to higher concentrations of these elements in the parent silicate magma but is thought to be largely the consequence of equilibration of the sulfide liquid with very large volumes of silicate magma. Accumulation of immiscible sulfide liquid droplets in the sill probably occurred over a period of time when large volumes of silicate magma were flowing through the sill and subsequently on toward the surface. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

Petrogenesis of a Proterozoic nickel-sulfide-komatiite association; the Katiniq Sill, Ungava, Quebec

The Katiniq nickel deposit is an example of an association of magmatic Fe-Ni-Cu sulfides with komatiitic volcanism, in the Cape Smith-Wakeham Bay foldbelt in northern Quebec. The deposit is unusual because of its Proterozoic age in contrast to the Archcan ages of most other deposits of this type, and is of interest in view of the relatively low degree of deformation and metamorphism to which it has been subjected.Nickel sulfide mineralization occurs within the Katiniq sill, an olivine-rich subvolcanic intrusive lens up to 150 m thick. The sill consists of a number of olivine-rich intrusive units, each characterized by a concentric zonation in olivine content from a maximum in the core to minimums at the margins. This zonation is attributed to a mechanism whereby the sill behaved as an open channel, forming part of a subvolcanic feeder system. Magma flowing through the channel carried a progressively higher proportion of intratelluric olivine phenocrysts with time, while crystallization of earlier, less olivine-rich material occurred inward from the margins. Flowage eventually became choked off as the channel became clogged with olivine.Sulfide mineralization occurs dominantly at or close to the base of the sill and shows a marked correspondence with irregularities in the footwall topography. Typical intersections consist of massive ore at the base, succeeded upward by net-textured ore and disseminated sulfides. These observations indicate a primary magmatic origin for the sulfides.The average composition of the liquid portion of the magma-olivine suspension intruded into the sill was that of a pyroxenitic komatiite, having an MgO content of about 19 percent. The chemical variations within the volcanic rocks overlying the sill are consistent with the derivation of these rocks from a liquid of this composition by low-pressure fractionation of olivine.The mean Ni/Cu ratio of the Katiniq sulfides is 4.3, close to that predicted for a sulfide liquid in equilibrium with a magma of the above composition. Massive sulfides may show significantly higher Ni/Cu ratios than net-textured and disseminated types, a discrepancy which is attributed to hydrothermal remobilization of Cu.Concentrations of precious metals, particularly Pt and Pd, are unusually high in the Katiniq sulfides; this may be partially due to higher concentrations of these elements in the parent silicate magma but is thought to be largely the consequence of equilibration of the sulfide liquid with very large volumes of silicate magma. Accumulation of immiscible sulfide liquid droplets in the sill probably occurred over a period of time when large volumes of silicate magma were flowing through the sill and subsequently on toward the surface.

The development of the deformation texture in zirconium during rolling in sequential passes

Slip and twinning systems activated by rolling in sequential passes were observed on a coarse grained zirconium polycrystal. At least five independent deformation modes are activated; slip and twinning systems occur simultaneously. For low degrees of deforma-tion the main slip system is prism slip\(\{ 10\bar 10\} \left\langle {12\bar 10} \right\rangle \), even when the orientation is not favorable. The lattice rotations caused by slip proceed gradually with increasing defor-mation; they are relatively small although the strain achieved can be large. On the other hand, twinning causes spontaneous, large-scale lattice rotations, even for low degrees of deformation. The type of twinning depends largely on the crystallographic orientation of the matrix. For basal pole orientations of the undeformed grains in the area 0 to 50 deg from the normal direction\(\{ 11\bar 22\} \) twinning becomes preferentially operative. For basal pole orientations of the undeformed grains in the area 50 to 90 deg from the normal direction, however,\(\{ 10\bar 12\} \) twinning becomes preferentially operative. In both orientation areas as a complementary system\(\{ 11\bar 21\} \) twinning is operative. For all deformation sys-tems their operation is independent of the azimutal position of the basal pole in these areas. The lattice rotations alter the orientation of the crystallites in such a way that the basal poles all become aligned more or less in the direction of the deforming compres-sive force. For higher degrees of deformation pyramidal slip with a (c + a) type Burgers Vector can explain why this preferred orientation is maintained as final position, which for zirconium shows a split of basal poles of ±30 to 50 deg towards the transverse direc-tion. The method of following the complicated interactions between different slip and twinning systems in a stepwise deformed, coarse grained sheet by 1) trace analysis of the deformation modes, 2) by correspondingly derived lattice rotations, and 3) by texture measurements leads to an explanation of the texture development in zirconium. It is dis-cussed on the basis of basal pole rotations.

Temperature dependence of the elastic properties of alginate gels

The moduli of elasticity of calcium and lead alginate gels increase with time after preparation, and the temperature dependence of the rate of syneresis suggests an activation energy of 8−12 x 10 4 J.mol− 1 for the formation of new junctions. At zero time, a negative temperature-dependence was found for the elastic force measured at a low degree of deformation (4%). Deformation of the gels was associated with an increase in entropy and internal energy. When the calcium ions in a preformed calcium alginate gel were exchanged for lead ions, which have a higher affinity for alginate, the modulus increased due to an enhanced increase in internal energy with deformation. Reversal of the sequence of introducing the two types of ions gave the opposite effect. The data suggest that the junctions are “weak points” in the gels, and that even small deformations can cause partial rupture.

Effect of alloying on the inheritance of the structure in overheated steel

1. It was shown that for deep-hardening steel of the 34KhN3M type additionally alloyed with vanadium or titanium prolonged heating at high temperatures (for example, during forging with a low degree of deformation) leads to the possibility of restoring the overheated austenite grain size during repeated heating (heat treatment). It should be taken into account that on prolonged holding the temperature for the reestablishment of grains overheated to 1300\2-1320\dgC can fall to 1250\dgC and even lower 1. Therefore the heating temperature for forgings or structural steels alloyed with vanadium or titanium must be considerably lower than that for steels not containing these elements. 2. Refining of the large restored grains in structural steels alloyed with vanadium or titanium can be achieved by normalizing or annealing at 1000\2-1150\dgC and subsequent quenching from normal austenitizing temperatures.

Loss of hardness of the tungsten-nickel-iron alloy during heating. Article II

1. The temperature for the beginning for recrystallization of the lubricant phase in the alloy depends on the degree of preliminary cold work of the alloy, decreasing from 1273 to 673°K with increase in deformation from 2 to 50%. 2. With low annealing temperature and low degrees of deformation, the processes of recovery connected with relaxation and polygonization occur mainly in the lubricant phase. With low degree of deformation, the recrystallization outstrips the relaxation and polygonization. With intermediate deformations, these processes occur simultaneously, and are superimposed one on the other. 3. The value for the critical deformation depends on the annealing temperature and decreases from 6 to 2% with increase in temperature of the latter from 1073 to 1573°K.

Properties of extruded nickel-alumina alloys

1. Aluminum oxide dispersed in the nickel matrix reduces the size of the grains and coherent scattering regions of the latter. These changes become particularly marked in alloys subjected to hot extrusion. 2. The compressive strength of extruded nickel-alumina alloys is higher than that of analogous alloys produced by the method of high-temperature sintering and of pure extruded nickel. The difference is particularly great at low degrees of deformation and high test temperatures. 3. The superiority of the mechanical properties of extruded alloys over those of alloys prepared by high-temperature sintering is due to their higher density, the smaller size of their grains and coherent scattering regions, and the smaller distance between their dispersed particles.

The effect of sintering temperature on the strength of powder copper subjected to repeated pressing

1. Sintered copper produced by repeated pressing and sintering at low temperatures is markedly superior to cast commercial copper in hardness and resistance to compression. 2. High-temperature sintering is not essential for obtaining powder copper with a minimum pore content. Low porosity may be attained by repeated compaction and annealing at relatively low temperatures. 3. The mechanical properties of sintered copper increase with decreasing sintering temperature. When materials obtained at different sintering temperatures are compared with one another and with cast copper, it is found that the greatest difference in the resistance to compression is observed at low degrees of deformation. 4. The deterioration of mechanical properties and improvement of ductility at higher sintering temperatures may be explained by grain growth and a coarsening of the block structure. 5. The X-ray diffraction method of studying recrystallization, involving determination of the number of spots on interference lines in X-ray photographs, fails to detect the process of collective recrystallization during the sintering of compacts from electrolytic copper powder at up to 1000°C.