Mechanism of improvement of shape memory effect by ausforming in an Fe-28Mn-6Si-5Cr shape memory alloy

D. Z. Liu; D. F. Wang; Setsuo Kajiwara; Wenxing Liu; Takehiko Kikuchi; Norio Shinya; W. Y. Ji; M. Hang; D. Jia

doi:10.1117/12.388227

14 June 2000 Mechanism of improvement of shape memory effect by ausforming in an Fe-28Mn-6Si-5Cr shape memory alloy

D. Z. Liu, D. F. Wang, Setsuo Kajiwara, Wenxing Liu, Takehiko Kikuchi, Norio Shinya, W. Y. Ji, M. Hang, D. Jia

Proceedings Volume 3992, Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics; (2000) https://doi.org/10.1117/12.388227
Event: SPIE's 7th Annual International Symposium on Smart Structures and Materials, 2000, Newport Beach, CA, United States

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.

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D. Z. Liu, D. F. Wang, Setsuo Kajiwara, Wenxing Liu, Takehiko Kikuchi, Norio Shinya, W. Y. Ji, M. Hang, and D. Jia "Mechanism of improvement of shape memory effect by ausforming in an Fe-28Mn-6Si-5Cr shape memory alloy", Proc. SPIE 3992, Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics, (14 June 2000); https://doi.org/10.1117/12.388227

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KEYWORDS

Atomic force microscopy

Shape memory alloys

Transmission electron microscopy

Photomicroscopy

Nanoimprint lithography

Atomic force microscope

Atrial fibrillation

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