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Proceedings Paper

Mechanism of improvement of shape memory effect by ausforming in an Fe-28Mn-6Si-5Cr shape memory alloy
Author(s): D. Z. Liu; D. F. Wang; Setsuo Kajiwara; Wenxing Liu; Takehiko Kikuchi; Norio Shinya; W. Y. Ji; M. Hang; D. Jia
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Paper Abstract

Ausforming treatment can improve the shape memory effect of Fe-Mn-Si based shape memory alloys, however, the mechanism of this improvement is not so clear. In this paper, the influence of ausforming treatment on stress-induced martensitic transformation and its reverse transformation in an Fe-28Mn-6Si-5Cr shape memory alloy has been studied using atomic force microscope and TEM aiming to clarify the origin of this improvement. It was found that the ausforming treatment at 970K by 9 percent pre-straining, which is the optimum condition for improving shape memory recovery, can introduce many uniformly distributed stacking faults on the same slip plane in austenite. When an external stress is applied to such an ausformed specimen for shape change, uniformly distributed martensite bands with the same variant are produced in a grain due to the assistance of those preexisted stacking faults. When being heated over Af, these martensite bands are nearly completely reverse-transformed to parent phase through the same atomic pass as for the forward transformation, so a nearly perfect shape memory effect is obtained.

Paper Details

Date Published: 14 June 2000
PDF: 9 pages
Proc. SPIE 3992, Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics, (14 June 2000); doi: 10.1117/12.388227
Show Author Affiliations
D. Z. Liu, National Research Institute for Metals (Japan)
D. F. Wang, Tianjin Univ. (China)
Setsuo Kajiwara, National Research Institute for Metals (Japan)
Wenxing Liu, Tianjin Univ. (China)
Takehiko Kikuchi, National Research Institute for Metals (Japan)
Norio Shinya, National Research Institute for Metals (Japan)
W. Y. Ji, Tianjin Univ. (China)
M. Hang, Tianjin Univ. (China)
D. Jia, Tianjin Univ. (China)


Published in SPIE Proceedings Vol. 3992:
Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics
Christopher S. Lynch, Editor(s)

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