Superelasticity is one of the most important functional characteristics of shape memory alloys, which essentially originates from stress-induced reversible thermoelastic martensitic transformation. The superelastic working temperature range is mainly influenced by the synergistic effect of alloy chemical composition and microstructure. The development status of several shape memory alloy systems with broad temperature range superelastic properties over the last ten years is methodically reviewed in this article, with an emphasis on contrasting the features and variations of various alloys in important performance parameters like recoverable strain, temperature dependence of critical stress, and superelastic temperature window. This article uses comparative analysis to support the design, preparation, and engineering application of novel wide-temperature-range superelastic shape memory alloys theoretically and practically, as well as to offer opportunities for the field's future development.

With the rapid development of low-temperature fields such as deep space exploration, polar scientific research, low-temperature storage and transportation, the service conditions for low-temperature structural components are becoming increasingly stringent. Therefore, low-temperature materials have gradually become a research hotspot in the world. This article mainly summarizes the low-temperature performance and related mechanisms of common structural materials such as low-temperature steel, aluminum alloy, titanium alloy, aluminum matrix composites and resin matrix composites. The effects of different crystal structures, alloy types, alloying elements and other factors on the mechanical properties of structural materials such as low temperature strength, plasticity and toughness, and the mechanism of low temperature deformation, strengthening and toughening are concluded. The application and prospect of different grades of low-temperature structural materials in different fields at home and abroad are also briefly introduced. The future research prospect of low-temperature materials is put forward.