Deformation Mechanism and Stabilization of Martensite in TiNi Shape Memory Alloy

材料科学技术（英文）, 2010, 26(10): 936-940.

^1, , ^2, , ^3, , ^4,

1.Key Laboratory for Anisotropy and Texture of Materials,Northeastern University,Shenyang 110819,China

2.Structural Functions Research Group,Innovative Materials Engineering Laboratory,National Institute for Materials Science,Tsukuba 305-0047,Japan

3.Key Laboratory for Anisotropy and Texture of Materials,Northeastern University,Shenyang 110819,China

4.Department of Production Systems Engineering,Toyohashi University of Technology,Toyohashi 441-8580,Japan

Deformation Mechanism and Stabilization of Martensite in TiNi Shape Memory Alloy

Shuai Wang ^1, , Koichi Tsuchiya ^2, , Lei Wang ^3, , Minoru Umemoto ^4,

1.Key Laboratory for Anisotropy and Texture of Materials,Northeastern University,Shenyang 110819,China

2.Structural Functions Research Group,Innovative Materials Engineering Laboratory,National Institute for Materials Science,Tsukuba 305-0047,Japan

3.Key Laboratory for Anisotropy and Texture of Materials,Northeastern University,Shenyang 110819,China

4.Department of Production Systems Engineering,Toyohashi University of Technology,Toyohashi 441-8580,Japan

Keywords： TiNi shape memory alloy

The deformed microstructures of a TiNi shape memory alloy were investigated in present study to clarify the deformation mechanism. It is found that the stress-strain curve was divided into three stages based on the deformation modes. The cause of martensitic stabilization effect was also interpreted by paying special attention to the deformed microstructures. Transmission electron microscopic examination revealed that at the early stage of deformation martensitic reorientation and compound twinning relieved some of the elastic strain energy stored in martensite, and this contributes to the martensitic stabilization effect. However, when deformation strain became larger, the density of dislocations increased correspondingly. Antiphase boundaries were also found. The degree of ordering; was therefore decreased due to dislocations and antiphase boundaries. So disordering was another cause of martensitic stabilization effect. In the middle stage of deformation martensitic stabilization was attributed to the two reasons above.

参考文献

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Deformation Mechanism and Stabilization of Martensite in TiNi Shape Memory Alloy

参考文献