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Rare Metals

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01-06-2013

Phase transformation behavior and mechanical properties of Ti₅₀Ni_49−xFe₁Co_x shape memory alloys

Authors: Bin Chen, Fu-Shun Liu

Published in: Rare Metals | Issue 3/2013

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Abstract

In this article, the influence of Co addition on phase transformation behavior and mechanical properties of TiNiFe shape memory alloy was investigated extensively. Differential scanning calorimetry (DSC) measurements shows that martensitic start transformation temperatures (M _s) decrease drastically with increasing Co content, while the R phase transformation start temperatures (R _s) vary slightly. Nevertheless, the substitution of Ni with Co does not exert substantial influence on the two-stage transformation behavior of the TiNiFe alloy. The results from stress–strain curves indicate that higher critical stress for stress-induced martensitic transformation (σ _SIM) has been obtained because of Co addition. In such cases, the Ti₅₀Ni₄₈Fe₁Co_1.0 alloy maintains a good shape memory effect, and a maximum recoverable strain of 7.5 % can be obtained.

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Title: Phase transformation behavior and mechanical properties of Ti50Ni49−x Fe1Co x shape memory alloys
Authors: Bin Chen
Fu-Shun Liu
Publication date: 01-06-2013
Publisher: Nonferrous Metals Society of China
Published in: Rare Metals / Issue 3/2013
Print ISSN: 1001-0521
Electronic ISSN: 1867-7185
DOI: https://doi.org/10.1007/s12598-013-0073-6

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