Alloy Additions Research Articles

Microstructure and performance of brazed diamond segments with NiCr–x(CuCe) composite alloys

Novel multi-layer brazed diamond segments were fabricated using NiCr–x(CuCe) composite alloys. Differential scanning calorimetry curves of the composite alloys were measured and analysed. The microstructures of the alloy segments and surface topographies of the brazed diamond segments were characterised. Performance tests of the alloy segments and brazed diamond segments were performed. The undercooling degree of the Ni–Cr alloy in the composite alloy increased with the Cu–Ce alloy addition, which led to coarse NiCu-rich regions and Ni3Si phases. A brazed diamond segment with a 5% Cu–Ce alloy addition exhibited the highest wear resistance and machining performance and the best surface morphology after a wear test. An excessive Cu–Ce alloy addition led to a rapid decrease in wear resistance of the brazed diamond segment owing to the large number of coarse NiCu-rich phases falling off from the composite alloy. The mechanism of the reduction in thermal damage to diamonds by the Cu–Ce alloy is elucidated. Initially the Cu–Ce particles melted and mainly Ni atoms diffused into the Cu–Ce liquid, thereby leading to the formation of NiCu-rich regions and Ce2Ni7 and CeNi2 phases, which in turn promoted the diffusion. The melting temperature of the Ni–Cr composite alloy was significantly reduced by the addition of the Cu–Ce alloy.

A review on nano-/ultrafine advanced eutectic alloys

Eutectic alloys with two alternating phases in the microstructure are well known for their excellent mechanical properties as well as superior castability. In this review, we have surveyed a large number of eutectic/near-eutectic alloys, their recent advancement mostly in Al-, Ni-, Ti-, Fe-base binary, ternary, multicomponent, and high entropy alloy systems. The fundamental of the growth mechanisms, interface instability, and different types of eutectic reactions are discussed. The effect of alloy addition on the evolution of nano-/ultrafine eutectic microstructure upon solidification, the morphology of phases, and their length scale in the range of 80 nm–2 μm, have been thoroughly illustrated with examples and case studies. The adopted methods to find eutectic composition in multicomponent systems have been guided. The enhanced hardness, and superior yield strength under tension and compression up to 2.5 GPa at room temperature as well as at high temperature up to 1000 °C has been correlated with the microstructure. The mechanism of slip transfer through the lamellae interface and the role of elastic constants of the individual phases on the evolved plasticity have been interlinked. Furthermore, an insight to the functional and critical mechanical properties, especially the evolution of soft magnetic properties, large fatigue limit, high temperature creep behavior, wear and corrosion resistance of a large number of eutectic alloys are discussed along with the engineering applications.

Experimental Investigation of FCCI Using Diffusion Couple Test Between UZr Fuel with Sb Additive and Cladding

Alloying additions are introduced into U-Zr fuel in order to bind lanthanides (e.g., cerium) and prevent their migration to the fuel-cladding interface. Antimony (Sb) is being investigated as a candidate additive. The present study focuses on the diffusion couple behavior of U-10Zr (wt%) alloy with Sb against cladding (iron or HT9) at 640°C. The diffusion cross sections were analyzed using a scanning electron microscope and X-ray diffraction. Zr-rind was found at the interface of the fuel alloy, Sb was found to be bound in Sb-Zr precipitates or Sb-Ce precipitates, and no reaction was found between Sb precipitates and the cladding materials.

REGULARITIES OF HYDROLYSIS OF ALUMINUM ACTIVATED BY Ga-In-Sn EUTECTIC ALLOY AND ZINC

Aluminum is a promising metal for creating energy-storing substances (ESS) on its basis for hydrogen evolution from water as a result of its of activating aluminum and providing it with the ability to react with water, special attention is paid to methods of alloying it with additions of low-melting metals and alloys, in particular, the eutectic alloy of gallium, indium and tin is perspective alloy for alloying aluminum and obtaining ESS, capable of releasing hydrogen from water without additional heating. The temperature at which stable interaction of aluminum activated by low-melting metals and alloys with water begins to be determined by the temperature at which alloying metals on the surface of aluminum crystallites become liquid. The melting point of the four-component Ga61In25Sn13Zn1 eutectic is about 3 °C, what is about 8 °C lower than the melting point of the Ga-In-Sn eutectic. Therefore, in this work, aluminum was activated by the eutectic alloy of gallium, indium and tin, as well as zinc, and the regularities of the hydrolysis of the obtained EAPs were investigated.
 Comparative volumetric determinations of hydrogen, which was released during the hydrolysis of 95 wt.% Al + 5 wt.% Ga-In-Sn eutectic and 92 wt.% Al + 5 wt.% Ga-In-Sn eutectic + 3 wt.% Zn alloys, showed that the introduction of zinc into activated aluminum led to a significant acceleration of hydrogen evolution from water at low temperatures (25 and 40 °C). The effective rate constants of hydrolysis of the zinc-doped alloy, calculated using the modified Prout-Tompkins equation, were 1.33, 1.75, 2.19, and 2.58 min-1 at temperatures of 25, 40, 55, and 70 °C, respectively. The effective activation energy of the process, calculated from the temperature dependence of the effective rate constant, was 12.6 kJ·mol-1, which indicates diffuse control of the hydrolysis rate. An analysis of the X-ray diffraction pattern of the products of the hydrolysis of 92 wt.% Al + 5 wt.% Ga-In-Sn eutectic + 3 wt.% Zn alloy at the temperature of 55 °C showed that they contain boehmite, baerite and small amounts of alloying metals.

The effects of Fe and Si on the phase equilibria in a γ′-strengthened Co–Al–W-based superalloy

The effects of Fe and Si alloying additions (by replacing Co) in a base alloy composition (expressed as mole fraction times 100) Co–20Ni–10Cr–10Al–7W-0.1B on the stability of the microstructure were investigated at 800 °C and 900 °C. The two-phase γ+γ′ microstructure was found to be greatly destabilized with Fe-additions in a mole fraction of 5% or greater, exhibiting a decrease in γ′ solvus temperature by about 8 °C for each 1% Fe added, and a significantly higher volume of secondary phases μ and B2 compared to the base alloy at both temperatures. In contrast, Si additions of up to a mole fraction of 1% did not decrease the γ′ stability by an appreciable amount. Characterization of the Si additions showed no decrease in γ′ solvus temperature, no change in the fractions of secondary phases in the annealed microstructure after annealing for 168 h at 800 °C with 0.5% Si, and only a slight increase in the secondary phase fractions for a mole fraction of 1% Si. Annealing at 900 °C for 1001 h, however, did show an increase in secondary phase formation, suggesting a decrease in the stability of the two-phase γ+γ’ microstructure at higher temperature. The present results show that it may be possible to add up to a mole fraction of 1% Si for increased oxidation resistance without significantly degrading the high temperature capability of the base Co-base superalloy.

Lab and Pilot-Scale Synthesis of MxOm@SiC Core-Shell Nanoparticles.

The addition of light ceramic particles to bulk technological materials as reinforcement to improve their mechanical properties has attracted increasing interest in the last years. The metal matrix composites obtained using nanoparticles have been reported to exhibit an improvement of their properties due to the decrease in the size of the ceramic additives to the nanoscale. Additionally, important effects such as the dispersion of the nanoparticles, wettability, and low reactivity can be controlled by the modification of the nanoparticles’ surface. In this work, we present the preparation of core–shell MxOm@SiC nanoparticles with different shell compositions. The accurate and reproducible preparation is developed both at the lab and pilot scale. The synthesis of these core–shell nanoparticles and their scale-up production are fundamental steps for their industrial use as additives in metal matrix composites and alloys. Powder X-ray diffraction and energy dispersive X-ray (EDX) coupled with scanning transmission electron microscopy (STEM) are used to corroborate the formation of the core–shell systems, whereas line scan-EDX analysis allows measuring the average shell thickness.

Grain refinement of 24 karat gold (99.99 wt.% pure) and 22 karat gold (Au-5.8wt.%Cu-2.5wt.%Ag) by Au-6wt.%Ti grain refiner

In this paper, the 24 karat (99.99 wt.% pure) and 22 karat gold (Au-5.8wt.%Cu-2.5wt.%Ag) were grain refined with Au-6wt.%Ti master alloy and the mechanism of grain refinement was studied. The Au-6wt.%Ti master alloy containing Au2Ti and Au4Ti intermetallic particles was added into 24 karat and 22 karat gold at various addition levels of Ti (0.1, 0.2 and 0.3 wt.%) for grain refinement. The intermetallic particles undergo peritectic reaction with liquid Au in sequence to nucleate α-Au solid. It is observed that both the 24 karat gold and 22 karat gold showed efficient grain refinement at the lowest addition level of Ti (0.1 wt.%). However, 22 karat showed better grain-refining efficiency than 24 karat at all addition level of Ti studied. The mechanism of grain refinement of gold in this study matches with the “Peritectic theory” and “Solute paradigm” proposed for the grain refinement of aluminium. It is also observed that increasing the master alloy addition level to 0.2 and 0.3 wt.% Ti coarsening in the grain size in both 24 karat and 22 karat, but significant in the case of 24 karat gold due to recalescence effect. The grain-refined 24 karat and 22 karat gold at 0.1 wt.% Ti showed improvement in the hardness in comparison to the un-grain refined one.

Preparation of TA15 powder reinforced 45CrNiMoY alloy steel with high mechanical property by pre-laid laser cladding technology

Based on the principle of in-situ precipitation strengthening, TA15 powder (Ti-6.5Al-1Mo-1V-1.5Zr) was used as an additive to improve the mechanical properties of 45CrNiMoY alloy steel by pre-laid laser cladding (PLLC) technology. Effects of the content of TA15 powders (0–1.5 wt%) on the microstructure, precipitation mechanism and mechanical property of PLLC 45CrNiMoY alloy steel samples were investigated. Results indicate that TA15 alloy has a significant effect on the microstructure of 45CrNiMoY alloy steel through metallurgical reaction in the laser molten pool. With the increase of TA15 powder content, the granular bainite (GB) microstructure were remarkably refined, the mount of the acicular ferrite (AF) was increased, and in-situ precipitates such as Ti-Y2O3-Zr (TYZ) composite oxide, TiC and ZrC carbide were produced. The 45CrNiMoY alloy steel sample with 1.0 wt% TA15 alloy addition has the best combination of tensile strength (1158 ± 9.7 MPa) and elongation (9.8 ± 0.4%), its microhardness was improved by 25.6% compared with the sample without TA15 powder. The TYZ composite oxides did not only serve as the AF nucleation sites but also spheroidize the detrimental manganese sulfide phase leading to a good elongation of the 45CrNiMoY alloy steel, the TiC and ZrC carbides played a key role in the improvement of the microhardness and tensile strength. The proper addition of TA15 powder can effectively improve the microstructure and mechanical properties of the PLLC 45CrNiMoY alloy steel.

Mechanistic investigation of a low-alloy Mg–Ca-based extrusion alloy with high strength–ductility synergy

High strength–ductility synergy is difficult to achieve in Mg alloys. Although high strength has been achieved through considerable alloying addition and low-temperature extrusion, these techniques result in low ductility (2%–5%). In this work, a novel low-alloy Mg–Ca-based alloy that overcomes this strength–ductility trade-off is designed. The alloy has an excellent tensile yield strength (∼425 MPa) and exhibits a reasonably high elongation capacity (∼11%). A microstructure examination reveals that a high density of submicron grains and nano-precipitates provides the alloy high strength, and the leaner alloy additions and higher extrusion temperatures initially improve ductility. As a result, the density of residual dislocations is reduced, and the formation of low-angle grain boundaries (LAGBs) is enhanced. With fewer residue dislocations, it becomes less probable for the newly activated mobile dislocations to be impeded and transformed into an immobile type during the subsequent tensile test. The LAGBs function as potential sites to emit new dislocations, thus enhancing the dislocation–multiplication capability. More importantly, they can induce evident sub-grain refinement hardening and guarantee that the alloy achieves high strength. The findings lead to a controllable Mg alloy design strategy that can simultaneously afford high strength and ductility.

Physical modelling of fluids’ interaction during liquid steel alloying by pulse-step method in the continuous casting slab tundish

ABSTRACT The continuous steel casting process is characterised by physico-chemical phenomena that are considered in the macro- and microscale. This paper attempts to assess the impact of local changes in the hydrodynamics of liquid steel flow in a one-strand slab tundish on the behaviour of the alloy addition, and consequently, the chemical homogenisation of the liquid steel entering the mould. Four variants of feeding the alloy addition to the liquid steel were considered. Water glass model was used for laboratory experiments. A tracer was fed into the water using the pulse-step method. Based on the mixing curves, the mixing time was calculated. Based on the laboratory experiments carried out, it has been found that, the alloy addition feeding site affects the mixing time, both for symmetric and asymmetric feeding relative to the longitudinal axis of the tundish.

СУЧАСНІ ТЕНДЕНЦІЇ ВИРОБНИЦТВА КОРОЗІЙНОСТІЙКОГО І ВОГНЕСТІЙКОГО НЕНАПРУЖЕНОГО АРМАТУРНОГО ПРОКАТУ

The aim of this work is to study modern methods of production of corrosion-resistant and fire-resistant stress-free reinforcing bars in the world. Non-stressed reinforcing bars are used as working, structural and assembly reinforcement in conventional building structures, as well as in various types of prestressed structures: from openwork prefabricated to huge monolithic hydraulic structures, therefore, its assortment produced by the domestic metallurgical industry in the range from 5,5 to 40 mm in the nominal diameter of a smooth profile and from 6,0 to 40 mm for a periodic profile. Recently, in the world, much attention is paid to the design and construction of buildings and structures with an improved complex of consumer properties, intended, in particular, for work in corrosive and fire hazardous environments. Such developments are not currently being conducted in Ukraine. In the world and in Europe, to increase corrosion resistance and fire resistance, as well as for the manufacture of seismically resistant reinforcing bars (δmax≥7,5 %), hot-rolled low-alloyed (additionally alloyed with V and Mo) and microalloyed steel grades without the use of heat treatment or cold-deformed (cоld stretched) from hot rolled strip of periodic profile. In GOST 34028-2016 for the countries of the Customs Union, it is clearly stated that for the reinforcement of prefabricated reinforced concrete structures and monolithic reinforced concrete, unstressed reinforcing bars in bars or coils with a nominal diameter of 4,0 to 40 mm are also used for the production of such rolled products, low-carbon and low-alloy steel grades are used, which microalloy V, Nb, Mo or add nitride-forming elements Al, Ti, V, Nb. In this case, either hot rolling or cold deformation or heat treatment in the flow of the rolling mill is used. An alternative way of producing corrosion-resistant and fire-resistant stress-free reinforcing bars in the world is the use of stainless steel as a material. Such profiled reinforcing bars are produced in the range of 3,0 to 50 mm by hot rolling or cold deformation. The use of modern technologies for the production of stainless steel reinforcing bars, starting with the addition of effective and high-quality alloying elements and additives in the production of liquid steel and effective methods of metal pressure treatment, which allows us to guarantee the material saving from corrosion and high temperatures in case of fire. A significant disadvantage of this rolled product is its rather high cost.

The influence of ternary and quaternary alloy additions on the superelastic behaviour of metastable Ti-Nb based alloys

The superelastic behaviour of Ti-Nb alloys gives rise to properties that are attractive for specific applications in the biomedical and aerospace sectors. However, to date, industrial utilisation of these alloys has been limited due the inability to tailor the transformation conditions or achieve stable cyclic behaviour. Alloying is the primary method for modifying transformation conditions but significant variations exist between the results of different studies within the literature. Here, to try and provide increased clarity, the transformation behaviour of Ti-24Nb-(0-8)Ta and Zr (at.%) have been investigated using in situ synchrotron diffraction to directly assess the transformation behaviour of the alloys in response to both temperature and tensile loads. In contrast to previous reports, no evidence of the αʺ phase was found in any of the alloys when cooled from 350 to -196˚C. In addition, the β to αʺ transformation was observed to be reversible when loaded at both 30˚C and ‑196˚C. These observations suggest that β stability may be far greater than previously thought and requires a review of the current mechanistic understanding.

Grain size prediction and investigation of 7055 aluminum alloy inoculated by Al–5Ti–1B master alloy

The effect of Al–5Ti–1B master alloy addition level on the grain size of 7055 aluminum alloy was studied by the standard T-golf method and the free growth model. The features of the commercial Al–5Ti–1B master alloy were analyzed by X-ray diffraction (XRD), optical microscope (OM) and scanning electron microscope (SEM). The size distribution of TiB2 particles in the Al–5Ti–1B master alloy is well fitted by a log-normal function. The cooling curve of 7055 aluminum alloy is measured by a thermocouple. As the amount of Al–5Ti–1B master alloy increases, the grain size of the 7055 aluminum alloy decreases rapidly first and then becomes slowly. When the refiner content exceeds 0.5 wt%, the grain size tends to be stable, and the refinement limit is about 40 μm. The grain sizes were calculated by the free growth model with input of cooling rate, solute concentration, addition level of Al–5Ti–1B master alloy and size distribution of TiB2 particles. The prediction results are basically consistent with the experimental results. The fractions of active TiB2 particles are less than 5% at all addition levels and the efficiency progressively decreases with addition level. The grain size distribution is progressively uniform with the increase of Al–5Ti–1B master alloy addition. As the grain size of the 7055 aluminum alloy decreases, the second phases are diffusely distributed on the grain boundaries. So the area fraction of coarse second phases is reduced, and the defects such as porosities are also reduced.

Influence of Selected Deoxidizers on Chemical Composition of Molten Inclusions in Liquid Steel

The conditions of nonmetallic inclusions formation by using manganese, silicon, and aluminum deoxidizers in a steel bath (four steel grades) are reviewed in the presented paper. The changes in the chemical composition of nonmetallic inclusions were calculated under thermodynamic equilibrium conditions between liquid steel containing Mn, Si, O, Al and the formed liquid oxide phase, applying a non-commercial (author’s) computer program. The impact of the order of dispensing alloy additions, and the initial manganese content in steel on the final oxygen concentration, as well as the evolution of the chemical composition of nonmetallic inclusions were considered. The acquired results indicate that the proposed calculation procedure can be used to design the desired chemical composition of steel with a controlled value and chemical composition of nonmetallic inclusions.

Effect of Mg addition on microstructure and mechanical properties of Al-Si-Cu-Fe alloy with squeeze casting

In this work, the Al-10Si-2.5Cu-0.8Fe alloy was used as the base alloy to squeeze casting with different content Mg-10Al master alloy addition. The effects of microstructure and mechanical properties were investigated by XRD, OM, SEM, and tensile test analysis. The results show that with the increase of Mg addition, the morphology of eutectic Si in the alloy changes from strip to fiber and the size is obviously reduced. Al8Mg3FeSi6 phase in the microstructure gradually grows, and the splitting effect on the matrix structure is increased. The tensile strength and elongation of the alloy increased first and then decreased with the increase of Mg content. When the Mg content is 1.38%, the tensile strength of the alloy reached a maximum of 289 MPa and the elongation is 2.24%. The hardness of the alloy gradually increases. When the Mg content is 2.51%, the hardness reaches 121.8 HV. The cleavage surface in the fracture becomes fine with the increase of Mg content, the number of dimples increases, and the fracture mode transitions from quasi-cleavage fracture to brittle fracture.

Coercivity enhancement of nanocrystalline hot-deformed Nd-Fe-B magnets by low-melting eutectic MM-Cu (MM=La, Ce, Pr, Nd) alloys addition

MM85Cu15 (MM = La, Ce, Pr, Nd) eutectic alloys were added into the hot-deformed Nd-Fe-B magnets to enhance the coercivity. It is found that three endothermic peaks occur on the differential scanning calorimetry curve of the MM-Cu melt-spun ribbons at 432.2, 451.1 and 516.5 °C. The peaks substantially correspond to three types of MM-Cu low-melting eutectic phase. The coercivity of magnets increases when the MM-Cu content is lower than 4 wt%, and then keeps almost no change with the content further increasing to 5 wt%. The coercivity of the hot-deformed magnets with 4 wt% and without MM-Cu addition is 948 and 683 kA/m, respectively. Nearly all the platelet-shaped grains are isolated by the thickened intergranular phase after MM-Cu addition. Moreover, the average grain size of the magnets with MM-Cu addition decreases compared with that of the magnet without MM-Cu addition. Scanning electron microscopy images show that the areal fraction of the RE-rich grain boundary phase increases from 8.6% to 15.1% after MM-Cu addition. The La, Ce together with Cu and Ga aggregate at the grain boundary regions separating neighboring grains and smoothing the grain boundaries. Therefore, both the thickened grain boundary and decreased mean grain size result in the enhancement of coercivity after MM-Cu eutectic alloy addition.

CONCEPT OF A SEGMENTED PENETRATOR MADE OF TUNGSTEN HEAVY ALLOYS WITH VARIABLE STRENGTH PARAMETERS

The paper describes a concept of increasing the penetration capacities of kinetic antitank projectiles, having a penetrator made of a tungsten based sinter, through the application of materials with variable mechanical characteristics for penetrator’s particular segments. The influence of alloy additions on some strength parameters for the tung-sten based sinters were assessed by using the literature data, and in the next step by numerical analyses of steel plate penetration process calculated for selected configurations of structural materials of penetrator segments. The summary describes some possibilities for modification of the structure of tungsten based sinters which may decisively improve the penetrating capacities.

Influence of a new AlTiC–B master alloy on the casting and extruding behaviors of 7050 alloys

In this paper, a new kind of AlTiC–B master alloy, containing large amounts of nano‒sized TiC particles, has been applied in 7050 alloy. The influence of master alloy addition on the casting microstructures, extrusion behaviors and mechanical properties of 7050 has been investigated. It is found that 0.5 wt% addition of AlTiC–B master alloy exhibits the most attractive performance, resulting in much finer matrix grains and less casting defects. After hot extrusion, typical <100> and <111> fiber textures co‒exist in the microstructure of original 7050 alloy, whereas the alloys with AlTiC–B inoculation possess a higher intensity of <111> fiber texture. Besides, the inoculated alloys show better anti–recrystallization performance and larger local misorientation. It has been confirmed that a proper addition of AlTiC–B master alloy is beneficial for the mechanical properties of extruded 7050, which may be due to its refining effect on α–Al grains and its improvement for the precipitation of L12–ZrAl3. The Brinell hardness, ultimate tensile strength, yield strength and elongation of 7050 alloy with 0.5 wt% addition of AlTiC–B addition are 174 HBW, 665 MPa, 724 MPa and 9.8%, respectively. This work provides a promising prospect of AlTiC–B master alloy for applying in 7050 alloy in industries.

On the grain refining efficacy of Ti-free hypoeutectic AlSi via AlTiB, AlB and AlNbB chemical inoculation

Metals with a fine grain structure have intrinsic advantages like higher mechanical strength and more isotropic behaviour. An effective way of refining the grain size is via chemical inoculation. In this study the grain refining efficacy of AlTiB, AlB and AlNbB master alloys on a Ti-free AlSi alloy is investigated. In particular, the performance of commercial Al5Ti1B and Al5B master alloys is compared to that of a lab-made Al2Nb2B and two Al2NbxB (x = 1 and 2 wt%) made in an industrial pilot scale facility. Although chemical inoculation does not change the morphology of the grains, which is always equiaxed dendritic, it is found that the grain size progressively decreases with the master alloy addition rate and the achievable final grain size is strongly dependent on the chemistry of the master alloy used. The experimental results demonstrate that AlNbB > AlB > AlTiB in terms of grain refining efficacy.

Structural characteristics, mechanical behaviour and damping properties of Ni modified high zinc Al–Zn alloys

The microstructure, mechanical behaviour and damping properties of two high zinc Al–Zn alloys -Al-20Zn and Al-35Zn alloys—micro alloyed with 0.1, 0.2, and 0.3 wt% Ni were investigated in this study. The alloys were produced by liquid metallurgy processing using metal casting practice. The structural characteristics of the alloys were assessed using scanning electron microscopy and x-ray diffraction analysis while the mechanical properties (hardness, tensile properties and fracture toughness) and damping behaviour were also evaluated. The results show that the Al-35Zn alloys generally have finer grain sizes compared with the Al-20Zn alloys, while the use of 0.1 wt%Ni, resulted in the most significant grain size reduction. The hardness and tensile strength improved with the use of 0.1 and 0.2 wt% Ni for the Al-20Zn and Al-35Zn alloys, and strengthening was largely higher for the Al-35Zn alloys than the Al-20Zn alloys due to finer grain size and the greater proportion of the Zn rich η- phase. The percent elongation and fracture toughness improved with Ni addition in both Al-20Zn and Al-35Zn base alloys, but the use of up to 0.3 wt% Ni in some instance resulted in marginal improvement in both properties. Also, the use of 0.1 wt% Ni resulted in the most significant improvement in damping capacity for both high zinc Al–Zn alloys. Summarily, the use of 0.1–0.2 wt% Ni as micro alloying addition in Al-20Zn and Al35Zn base alloys resulted in improved strength, ductility, toughness and damping capacity in the alloys.