Effect Of Mischmetal Addition Research Articles

Effect of Mischmetal Addition on Microstructure and Mechanical Properties of As-Cast and As-Rolled Mg–Sn–Ca Alloys

The microstructures and mechanical properties of Mg–3Sn–0.1Ca–xMM (mischmetal, x = 0.3, 0.6, and 0.9 wt.%) alloys were investigated. Optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffraction spectroscopy (XRD) were used to characterize the microstructures and phase constitutions of the cast and rolled alloys. Room temperature tensile tests were conducted to obtain the mechanical properties and macro-textures to evaluate the texture weakening effect results of the MM. The results show that an abundance of second phase formed, confirmed as the (Ca,MM)MgSn phase, and the volume fraction increased with the increasing MM addition. The tensile yield strength of the as-cast alloys increased with the MM addition, but the elongation decreased. All of the rolled Mg–3Sn–0.1Ca–xMM alloys showed a strong basal texture, and only slightly decreased in intensity after annealing treatment due to the particle-stimulated nucleation of recrystallization. The as-annealed Mg–3Sn–0.1Ca–0.6MM alloys exhibited the highest tensile strengths of 266.5 ± 3.3 MPa and 136.1 ± 3.7 MPa, which are mainly ascribed to grain refinement strengthening, Orowan strengthening and texture strengthening.

Enhanced mechanical properties of Mg–Ni–xRE alloys via hot extrusion

The effects of mischmetal addition and hot working on the enhancement of microstructure and mechanical properties of Mg–Ni alloys were studied. It was revealed that grain refinement could be achieved by introducing rare earth (RE) elements in the as-cast condition, and more pronouncedly, by the extrusion process in the wrought condition. While the formation of intergranular brittle phases via RE addition impaired the as-cast mechanical properties, the remarkable grain refinement and fragmentation and dispersion of intermetallic particles significantly improved the mechanical properties in the extruded condition. The ultimate tensile strength and total elongation of the extruded Mg–1.5Ni–3RE alloy with an average grain size of 3.18 μm (347 MPa and 9%) were much larger than those for the as-cast counterpart (140 MPa and 3%).

Effect of Mischmetal Addition on Physical and Mechanical Properties of Al–Ni–Zr Melt-Spun Ribbons

In this work, the effect of mischmetal addition on the microstructural, physical and mechanical properties of rapidly solidified (Al90Ni8Zr2)(100−x)MMx (x = 0–6) alloys has been studied. In this respect, various as-spun ribbons were prepared by the single-roller melt-spinning process at a quenching wheel speed of 43 m/s. The results obtained showed that mischmetal had a strong effect on the control of amorphicity of the alloy during melt-spinning process. TEM and XRD results revealed the presence of two phases, nanocrystalline α-Al and amorphous phase of Al90Ni8Zr2 alloy compared with those of MM-added samples with an amorphous structure. This is believed to be related to the increase in glass-forming ability due to the addition of mischmetals to the alloy. The average crystallite size obtained for MM-free sample was in the range of 30 nm as confirmed by XRD and TEM data. Phase separation and formation of second phase were observed for 6 at.% MM-added sample in the as-spun state. DSC results revealed that glass transition and crystallization temperatures increased with the increase in mischmetal in Al90Ni8Zr2 system. Further, it was seen that the maximum microhardness value was obtained for the 4 at.% MM-added samples (4.72 GPa).

Effect of Misch Metal Addition on Lattice Strain and Physical Properties of Gas-Atomized Cu–Fe-Mm System

Effect of Misch Metal Addition on Lattice Strain and Physical Properties of Gas-Atomized Cu–Fe-Mm System

Effect of Misch Metal Addition on Thermal Conductivities and Mechanical Properties of Mg-4Zn-0.5Ca Alloys

The thermal conductivities of quaternary Mg-Zn-Ca-MM alloys have been investigated by evaluating the effect of MM on Mg-4Zn-0.5Ca alloys, with an emphasis to develop a new Mg alloy without compromising thermal conductivity, process-ability and mechanical property. As a result, the thermal conductivity of 0.5 wt.% MM-added Mg-Zn-Ca alloy was almost same as that of MM-free Mg-Zn-Ca alloy. However, with further increasing MM contents, thermal conductivities of MM-added alloys decreased. The tensile yield strength was improved with increasing MM contents. In addition, the average spiral flow lengths of Mg-Zn-Ca-xMM alloys were almost same levels with Mg-Zn-Ca alloy.

Effects of mischmetal addition on phase transformation and as-cast microstructure characteristics of M2 high-speed steel

The influence of mischmetal (Ce-La) addition on phase transformation and as-cast microstructure characteristics of M2 high-speed steel (HSS) was investigated using Thermo-Calc software, differential scanning calorimetry, X-ray diffractometry and scanning electron microscopy with energy dispersive spectrometry. The results showed that the measured phase transition points of M2 HSS were broadly consistent with the theoretical results. After mischmetal addition, the liquidus peak temperature, the peak temperature of the eutectic precipitation of M6C and MC were all increased, especially for the M6C which was affected significantly and increased about 31 °C. The contents of Mo and V in the eutectic carbide decreased and that of Fe increased, while in the matrix, the Mo, V and Cr contents all increased slightly. Furthermore, the microstructure of as-cast dendrite and ledeburite were refined, the total eutectic carbide content decreased and distributed into a discontinuous network, the lamellar spacing of M2C was reduced and the lamellae became thinner.

Effects of Mischmetal Addition on the Microstructural Characteristics of BCuP-2 Brazing Filler Metal

In this work, the effect of mischmetal (48wt%Ce–27wt%La–14wt%Nd–6wt%Pr) additions on the microstructural characteristics of an Cu-7wt%P brazing filler metal (BCuP-2) were investigated. The volume fraction of primary Cu was considerably increased with increasing mischmetal addition in the BCuP-2. Also, the eutectic structure was changed from lamella to fibrous morphology and the pseudo-eutectic phase (Cu3P) was formed around the primary Cu with the mischmetal addition above 0.03wt%. Compound containing a small amount of mischmetal was formed in the primary Cu phase and this compound acts as the nucleation sites of primary Cu. The fraction of primary Cu was increased by about 1-2wt% due to the mischmetal rich phase. The mischmetal rich phase also formed in the pseudo-eutectic phase and this enhanced the formation of pseudo-eutectic phase. The addition of mischmetal changes the eutectic phase lamella to fibrous by suppressing both the solid-liquid interfacial energy and the surface energy of the solid. The mischmetal additions showed a very strong influence on the nucleation process of primary Cu and the subsequent formation of Cu3P phase as well as the eutectic structure change.

The effect of mischmetal addition on the structure and mechanical properties of a cast Al-7Si-0.3Mg alloy containing excess iron (up to 0.6 Pct)

The effect of Fe content (0.2 to 0.6 pct) on the microstructure and mechanical properties of a cast Al-7Si-0.3Mg (LM 25/356) alloy has been investigated. Further, 1 pct mischmetal (MM) additions (a mixture of rare-earth (RE) elements) were made to these alloys, and their mechanical properties at room and at elevated temperatures (up to 200 °C) were evaluated. A structure-property correlation on this alloy was attempted using optical microstructure analysis, fractographs, X-ray diffraction, energy-dispersive analysis of X-rays (EDX), and quantitative metallography by image analysis. An increase in Fe content increased the volume percentage of Fe-bearing intermetallic compounds (β and π phases), contributing to the loweryield strength (YS), ultimate tensile strength (UTS), percentage elongation, and higher hardness. An addition of 1 pct MM to the alloys containing 0.2 and 0.6 pct Fe was found to refine the microstructure; modify the eutectic silicon and La, Ce, and Nd present in the MM; form different intermetallic compounds with Al, Si, Fe, and Mg; and improve the mechanical properties of the alloys both at room and elevated temperatures.

Effect of mischmetal addition on the electrochemical behavior of chromium-alloyed iron aluminide

Effect of mischmetal addition on the electrochemical behavior of chromium-alloyed iron aluminide

Effect of mischmetal addition on the high temperature oxidation behavior of chromium-alloyed iron aluminide

Effect of mischmetal addition on the high temperature oxidation behavior of chromium-alloyed iron aluminide

ChemInform Abstract: The Effect of Misch Metal Addition on Corrosion Behavior of Aluminum in Inorganic and Organic Acids

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

ChemInform Abstract: Effect of Misch Metal Addition on the Hot Plasticity of an Al‐Mg‐Si Wrought Alloy.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Effects of misch metal addition on the hot plasticity of an AlMgSi wrought alloy

A systematic investigation has been made of the effects of misch metal addition on the hot plasticity of an AlMgSi alloy containing 0.75% Mg and 0.39% Si by using a hot torsional test, and the mechanism of these effects examined by means of scanning and transmission electron microscopy. The results show that the hot plasticity of the alloy is obviously improved at 480–560 °C by addition of 0.16% misch metal. For this reason the homogenization process of the AlMgSiRE alloy RE6063 can be eliminated.

Effects of Mischmetal Addition on the Mechanical Properties of High Manganese Cast Steel

Effects of Mischmetal Addition on the Mechanical Properties of High Manganese Cast Steel

Effects of Mischmetal Addition on the Mechanical Properties of High Manganese Cast Steel

Effects of Mischmetal Addition on the Mechanical Properties of High Manganese Cast Steel

Effect of Mischmetal Addition on Cast Structure of High Manganese Steel

Effect of Mischmetal Addition on Cast Structure of High Manganese Steel