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| HOT DEFORMATION BEHAVIOR AND CONSTITUTIVE RELATIONSHIP OF NiTi SHAPE MEMORY ALLOY DURING COMPRESSION AT ELEVATED TEMPERATURES |
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| 北京科技大学 |
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Cite this article:
;. HOT DEFORMATION BEHAVIOR AND CONSTITUTIVE RELATIONSHIP OF NiTi SHAPE MEMORY ALLOY DURING COMPRESSION AT ELEVATED TEMPERATURES. Acta Metall Sin, 2007, 43(9): 930-936 .
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Abstract The hot deformation behavior of NiTi alloy was studied by compressive deformation tests in the strain rate range 0.001-10s-1 and temperature of 700-900℃, and associated structural changes were investigated by observations of metallography and TEM. By using regression analysis methods based on measured data, the material parameters of the Arrhenius-type hyperbolic-sine equation were resolved, and then fitted against deformation strains. Based on the above analysis, a constitutive equation which related the flow stress to temperature, strain rate and strain was established. The activation energy, Q, and lnA, decrease as the strain increases. However, the stress exponent, n, linearly increases with the increase of the strain. The main reasons that lead to the difference between the true stress-true strain curves of NiTi alloy and those of non-intermetallic materials are reciprocal order-disorder transition and dynamic recovery or dynamic recrystallization.
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Received: 16 January 2007
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