Deformation behavior of TiNiFe alloy in isothermal compression |
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Authors: | Shujuan Wang Xujun Mi Xiangqian Yin Yanfeng Li |
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Affiliation: | State Key Laboratory for Fabrication and Processing of Nonferrous Metals,General Research Institute for Nonferrous Metals,Beijing,100088,China |
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Abstract: | The hot deformation behavior of TiNiFe shape memory alloy was studied by isothermal compression tests.It was performed on a Gleeble-3500 thermal simulation machine at deformation temperature of 750 to 1050 ℃ and strain rate of 0.01 to 10.00 s-1 with maximum strain of 0.8.Deformation mechanism was investigated by the aid of true stress-true strain curves,kinetic analysis and processing map.The constitutive relationship was established in the form of Arrhenius-type hyperbolic-sine equation,and the apparent activation energy was calculated to be approximately 200 kJ·mol-1.The processing maps of TiNiFe alloy were appreciably influenced by true strain. |
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Keywords: | shape memory alloy high temperature deformation constitutive equation processing map |
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