On the potential of Ti50Au50 compound as a high temperature shape memory alloy

• Published in: Intermetallics Vol. 19; no. 10; pp. 1461 - 1465
• Main Authors: Declairieux, C., Denquin, A., Ochin, P., Portier, R., Vermaut, P.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.10.2011
• Subjects: A. Intermetallics; B. Martensitic transformation; B. Oxidation; B. Shape-memory effect; F. Mechanical testing; B. Oxidation; B. Shape-memory effect; A. Intermetallics; F. Mechanical testing; B. Martensitic transformation
• ISSN: 0966-9795; 1879-0216
• DOI: 10.1016/j.intermet.2011.05.028

High temperature shape memory alloys have received a large interest for many years but none of the systems studied so far has led to industrial applications yet. The titanium-gold system has been reported to develop a martensitic transformation at high temperature but the previous studies did not mention about shape memory effect in a quantitative way. Here are presented first elements concerning the potential of this compound as a high temperature shape memory alloy, from the functional properties and oxidation resistance point of view. A maximum recovered compression strain of 3.9% can be obtained for an initial compression strain of 5% corresponding to a 78% shape recovery, in the range of temperature 850–950 K. A two-way shape memory effect is also reported for the first time for this compound. The oxidation of the alloy at these temperatures seems to be a limitation but its behavior around 700 K is very promising. [Display omitted] ► Ti50Au50 presents a shape memory effect in the range 850–950 K. ► A maximum recovered strain of 3.9 % has been measured by compression tests. ► A two-way SME has been revealed in this compound for the first time.