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| A TRAINING-FREE CAST Fe-Mn-Si-Cr-Ni SHAPE MEMORY ALLOY BASED ON FORMATION OF MARTENSITE IN A DOMAIN MANNER I. Idea and realization |
| PENG Huabei; LIU Gang; WEN Yuhua; SUN Panpan; LI Ning |
| College of Manufacturing Science and Engineering; Sichuan University; Chengdu 610065 |
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Cite this article:
PENG Huabei LIU Gang WEN Yuhua SUN Panpan LI Ning. A TRAINING-FREE CAST Fe-Mn-Si-Cr-Ni SHAPE MEMORY ALLOY BASED ON FORMATION OF MARTENSITE IN A DOMAIN MANNER I. Idea and realization. Acta Metall Sin, 2010, 46(3): 282-287.
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Abstract Low cost Fe-Mn-Si based shape memory alloys (SMAs) has not got widely applications because of their poor shape memory effect (SME) and the need of thermo-mechanical training, so developing training-free Fe-Mn-Si based SMAs with high memory property is significant. In the present study, it was put forth that the formation of stress-induced ε martensite in a domain manner could improve the SME of Fe-Mn-Si based SMAs and it could be realized through subdividing austenite γ grains into smaller domains using the residual lathy δ ferrite phase. According to Hammar's equivalents, a cast Fe-18Mn-5.5Si-9.5Cr-4Ni alloy with Cr/Ni equivalent ratio of 1.85 was prepared. OM and VSM (vibrating sample magnetometer) examination showed that the as-cast microstructure consists of γ austenite and lathy δ ferrite phase, and the lathy δ ferrite subdivided the austenite grains into smaller domains, which makes the stress-induced ε martensite bands form in a domain manner. Because the collisions between domain-like martensite bands were reduced, a high recovery strain of 4.9% was attained in the as-cast Fe-18Mn-5.5Si-9.5Cr-4Ni alloy. This result provides a novel way of developing training-free Fe-Mn-Si based SMAs. It can be expected that the SME of cast Fe-Mn-Si based SMAs will be further improved through modifying and optimizing alloy compositions, solidification parameters and heat treatment process.
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Received: 24 September 2009
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| Fund: Supported by National Natural Science Foundation of China (Nos.50501015 and 50871072) and Program for New Century Excellent Talents in University (No.NCET-06-0793) |
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