TEM study of pre-strain's effect on shape recovery character in an Fe-Mn-Si-Cr-Ni shape memory alloy

Zhixia Qiao; Lianjin Li; Dongai Wang; Zongmin Li

doi:10.1117/12.780033

1 November 2007 TEM study of pre-strain's effect on shape recovery character in an Fe-Mn-Si-Cr-Ni shape memory alloy

Zhixia Qiao, Lianjin Li, Dongai Wang, Zongmin Li

Proceedings Volume 6423, International Conference on Smart Materials and Nanotechnology in Engineering; 64232Y (2007) https://doi.org/10.1117/12.780033
Event: International Conference on Smart Materials and Nanotechnology in Engineering, 2007, Harbin, China

Abstract

Relationship between amount of recoverable strain and pre-strain in Fe-25%Mn-4.5%Si-1%Cr-2%Ni shape memory alloy (SMA) was measured in tensile tests. The results show that recoverable strain increases with increasing pre-strain lower than 5%, and decreases rapidly when the pre-strain go beyond 5%. By X-ray diffraction, the effect of pre-strain on volume fraction of stress induced ε martensite (εM) was determined and it was found that amount of εM first keeps increasing with pre-strain and then reaches saturation when pre-strain is over 8%. Transmission electron microscope (TEM) observation shows that morphology of stress induced εM for different pre-strain differs greatly and thus has different influence on shape memory effect (SME) of the alloy. Three types of morphology of εM were observed for different pre-strain, which are thin εM plates, wide εM bands of multilayer and intersecting εM variants respectively.

Citation Download Citation

Zhixia Qiao, Lianjin Li, Dongai Wang, and Zongmin Li "TEM study of pre-strain's effect on shape recovery character in an Fe-Mn-Si-Cr-Ni shape memory alloy", Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64232Y (1 November 2007); https://doi.org/10.1117/12.780033

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