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Proceedings Paper

TEM study of pre-strain's effect on shape recovery character in an Fe-Mn-Si-Cr-Ni shape memory alloy
Author(s): Zhixia Qiao; Lianjin Li; Dongai Wang; Zongmin Li
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Paper 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.

Paper Details

Date Published: 1 November 2007
PDF: 6 pages
Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64232Y (1 November 2007); doi: 10.1117/12.780033
Show Author Affiliations
Zhixia Qiao, Tianjin Univ. of Commerce (China)
Lianjin Li, Tianjin Univ. of Commerce (China)
Dongai Wang, Tianjin Univ. of Commerce (China)
Zongmin Li, Jiaotong Office of Qinglong County (China)

Published in SPIE Proceedings Vol. 6423:
International Conference on Smart Materials and Nanotechnology in Engineering
Shanyi Du; Jinsong Leng; Anand K. Asundi, Editor(s)

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