Abstract
Magnesium alloys have been used in the automotive industry and 3C (computer, communication, and consumer electronics) for many years. Their room temperature properties combined with their low density offer a wide range of applications, especially when processed by High Pressure Die Casting (HPDC). The use of magnesium alloys at higher temperatures is well-studied; special creep resistant alloys containing the rare earth elements silver or yttrium are needed. However, when it comes to very low temperatures, only a few studies have been performed to determine the property-microstructure relationship. The possible fields of application at low temperatures are aerospace and satellite parts and tanks for liquefied gases. This review shall not only examine mechanical properties at low temperatures, but also the permanent effects of cyclic or long-lasting cryogenic treatment on the microstructure and mechanical properties. It was found that cryogenic treatment is able to influence the precipitate concentration and grain orientation in some magnesium alloys. Reduction in the number of brittle phases is improving ductility in some cases. It is well-known that high speed tool steels, in particular, can be influenced by cryogenic treatment. Whether this is possible with magnesium alloys and what the mechanisms are shall be reviewed.
Highlights
Magnesium alloys are widely used in automotive applications, 3C, tools, and to some extent in aerospace and aeronautics
This review paper will describe the material properties tested at low temperatures, and mention the changes in mechanical properties after magnesium alloys have been exposed to cryogenic temperatures
The refinement tensile tests, it was shown that ductility increases significantly from 8.6% to 15.4% after 24 h of deep cryogenic treatment (DCT), the W phase and its increase in volume fraction was attributed to this behavior
Summary
Magnesium alloys are widely used in automotive applications, 3C (computer, communication, and consumer electronics), tools, and to some extent in aerospace and aeronautics. {10–12}, and {10–13} planes at low temperatures and at higher strain rates [2,3] which are needed to satisfy the von Mises yield criterion for unrestricted plastic deformation These twinning effects may act as a trigger for brittle fracture and enhance micro-cracks, which are undesired effects in structural materials [4]. This review paper will describe the material properties tested at low temperatures, and mention the changes in mechanical properties after magnesium alloys have been exposed to cryogenic temperatures. Both cases are of interest to understand the low temperature applications of magnesium alloys and the influence of low temperatures on microstructural features
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