Effect of Aging on Mechanical Properties of Ti-Mo-Al Biomedical Shape Memory Alloy

Abstract:

Effects of single- and multi-step aging on mechanical properties and shape memory properties of Ti-6Mo-8Al (mol%) biomedical shape memory alloy were studied using tensile tests at room temperature (RT). The solution-treated alloy at RT was two phase of bcc β and martensite α". Tensile tests revealed that the solution-treated alloy exhibited good shape memory effect. As for the single-step aging, (1) pseudoelastic shape recovery by unloading was observed after aging at 623K, (2) the alloy became brittle after aging at 773K due to ω embrittlement, and (3) strength was improved with small shape memory effect by aging at 1023K. On the other hand, after a multistep aging at 773K-1023K-1123K, the alloy was strengthened and showed perfect shape recovery. The improvement must be achieved by the formation of fine and uniform hcp α precipitates.

• Periodical: Materials Science Forum (Volumes 654-656)
• Pages: 2150-2153
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.654-656.2150
• Online since: June 2010
• Authors: Hideki Hosoda, Makoto Taniguchi, Tomonari Inamura, Hiroyasu Kanetaka, Shuichi Miyazaki
• Keywords: Aging, Mechanical Property, Shape Memory Alloy Actuator, Ti-Mo-Al, ω Embrittlement

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