![]() In the case of Ag, its addition to Mg-Sn alloys can improve the mechanical properties, greatly affects the grain refinement and corrosion resistance, and bias the age hardening response which enhances the mechanical properties. Indium was one of these elements and the authors were able to show that additions of In + Li to Mg-Sn alloys increase the number density of precipitates by approximately one order of magnitude, resulting in 150% hardening increment. for example, proposed a qualitative thermo-kinetic criteria for choosing microalloying elements that can be applied to precipitation hardenable alloys. Adding microalloying elements such as In, Ag, Ca, Li, Na, Zn, Sr and rare-earth elements can potentially achieve this goal. ![]() Hence, it is necessary to improve the age hardening response and creep resistance behavior. Unfortunately, the behavior of Mg-Sn alloys after quenching require quite long time to reach the peak hardness, which is not practical for industrial applications. Moreover, it is known that Sn can improve the corrosion resistance. Previous investigations also indicate that Mg-Sn alloys with additional alloying elements have comparable or even better creep properties than AE42 alloys. To this end, Mg-Sn based alloys are good candidates because they have stable microstructures and good mechanical properties at high temperatures due to the high solubility of Sn in hcp Mg and to the possibility to precipitate a cubic second phase (Mg 2Sn) in the magnesium-rich matrix. The current trend, instead, is to improve Mg-based alloys for high temperature applications. Unfortunately, most of these series have a number of undesirable properties (especially at elevated temperatures) including poor corrosion resistance, poor creep resistance, and low wear resistance, which restricts their applications. Up to now, several series of magnesium alloys have been developed for different applications, such as Mg-Al based, Mg-Zn based, Mg-RE based alloys. Magnesium and its alloys have some advantageous properties as high thermal conductivity, high dimensional stability, high damping characteristics, high machinability, and they are also completely recyclable, which makes them suitable for automobile and computer parts, aerospace components, and household equipment parts. The low density of magnesium alloys is a strong driving force for their applications in the transportation industry with the associated reductions in weight of vehicles and fuel consumption. Magnesium alloys, with a density around 1.74 g/cm 3 which is nearly 1.6 and 4.5 times less dense than aluminum alloys and steel, is an exceptionally lightweight structural materials.
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