Effects of thermo-mechanical training on a Fe59Mn30Si6Cr5 shape memory alloy

[摘要] The effects of thermo-mechanical training on a Fe59Mn30Si6Cr5 (numbers indicate wt.%) shape memory alloy are studied in this study. The thermo-mechanical training is carried out by controlling the training parameters of applied strain, annealing temperature and cyclic number. Experimental results show that the thermo-mechanical training can raise the stacking fault probability and reduce the critical stress of inducing epsilon martensite. Therefore, the epsilon martensite is easily stress induced from the gamma matrix. The cyclic hardening phenomenon occurs at low annealing temperature due to the accumulation of Shockley partial dislocations and stacking faults introduced during the training cycles. Meanwhile, the cyclic hardening phenomenon is more significant at higher tensile strain. At higher annealing temperature, the cyclic hardening effect can be reduced by eliminating the density of the dislocations and the epsilon martensite can be recovered to the gamma phase completely during the reverse transformation process. These features will improve the shape memory ability of Fe59Mn30Si6Cr5 alloy. (c) 2006 Elsevier B.V. All rights reserved.

[发布日期] 2006-12-25

[效力级别]  Proceedings Paper

[关键词] FeMnSiCr shape memory alloys;thermo-mechanical training;stress-induced martensite