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Indentation-induced two-way shape-memory effect in aged Ti-50.9 at.% Ni

Published online by Cambridge University Press:  02 January 2015

Mareike Frensemeier ,
Eduard Arzt ,
Enwei Qin ,
Carl P. Frick  and
Andreas S. Schneider
Mareike Frensemeier*
Affiliation:
INM—Leibniz Institute for New Materials, Saarbrücken 66123, Germany; Saarland University, Saarbrücken 66123, Germany
Eduard Arzt
Affiliation:
INM—Leibniz Institute for New Materials, Saarbrücken 66123, Germany; Saarland University, Saarbrücken 66123, Germany
Enwei Qin
Affiliation:
Suzhou Nuclear Power Research Institute Co., Ltd., Suzhou 215004, China
Carl P. Frick
Affiliation:
Department of Mechanical Engineering, University of Wyoming, Laramie, Wyoming 82071
Andreas S. Schneider
Affiliation:
INM—Leibniz Institute for New Materials, Saarbrücken 66123, Germany
*
Address all correspondence to Mareike Frensemeier atmareike.frensemeier@inm-gmbh.de
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Abstract

In this study, Vickers indentation was used to investigate the two-way shape-memory effect (TWSME) in an austenitic Ti-50.9 at.% Ni alloy, exposed to different heat treatments. Three aging treatments were used to manipulate the size of Ti3Ni4 precipitates. All samples were Vickers indented, and the indent depth was investigated as function of thermal cycling. The TWSME was found only in the material aged at 400 °C, which contained coherent precipitates. Thermal cycling shows stable TWSME, however, heating well above the austenite finish temperature lead to permanent austenitic protrusions. The results indicate that stabilized martensite plays a critical role in creating TWSME surfaces.

Type
Research Letters
Information
MRS Communications , Volume 5 , Issue 1 , March 2015 , pp. 77 - 82
Copyright
Copyright © Materials Research Society 2015 

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