期刊
ADVANCED ENGINEERING MATERIALS
卷 13, 期 1-2, 页码 48-56出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adem.201000200
关键词
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资金
- National Natural Science Foundation of China [50501015, 50871072]
- Natural Science Foundation for Young Scientists of Sichuan Province in China [2010A01-436]
The proposed key to producing a good shape memory effect in Fe-Mn-Si alloys is to reduce or even prevent the collisions between martensite bands. A method for realizing this is to make stress-induced martensite bands form in a domain-specific manner. We developed a novel training-free cast Fe-18Mn-5.5Si-9.5Cr-4Ni alloy with residual lathy delta ferrite based on this idea. The recovery strain reached 6.4% only after annealing the cast Fe-18Mn-5.5Si-9.5Cr-4Ni alloy. Microstructure observations indicated that the lathy delta ferrite made the stress-induced martensite form in a domain-specific manner by first subdividing grains into smaller domains. We hypothesize that through adjusting alloy compositions, solidification parameters, and heat treatment technique, the shape recovery of cast Fe-Mn-Si alloys can be further improved. Such a finding will provide a novel method for developing training-free Fe-Mn-Si shape memory alloys.
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