Thermodynamic Analysis on Relation Between T0 and sM in a Ti44Ni47Nb9 Shape Memory Alloy

Abstract

Abstract: The effect of heat treatment on martensitic transformation behavior has been investigated in Ti44Ni47Nb9 alloy. The relation between transformation temperatures and critical stress of stress induced martensitic transformation is interpreted in terms of thermodynamic theory. It is shown that the decrease in transformation temperature in specimens of slow cooling rate or low temperature aging after solution heat treatment results from the changes of Ni/Ti ratio in the matrix. The increase of critical stress of stress induced martensitic transformation is a consequence of the decrease of transformation temperatures.

Key words: Ti44Ni47Nb9 shape memory alloy, Transformation, Thermodynamics

Wei JIN, Mingzhou CAO, Rui YANG, Zhuangqi HU, Shaoyu QIU, Hong ZOU. Thermodynamic Analysis on Relation Between T0 and sM in a Ti44Ni47Nb9 Shape Memory Alloy[J]. J Mater Sci Technol, 2002, 18(06): 538-540.

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Thermodynamic Analysis on Relation Between T0 and sM in a Ti44Ni47Nb9 Shape Memory Alloy

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