（School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China）
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DOI:
10.7502/j.issn.1674-3962.2012.03.05
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Abstract:
The mechanism of reorientation and redistribution of martensitic multivariants under the cyclic stress was studied by using PhaseField method. The results showed that under the small loading,the twin boundary migration is the main mechanism and three variants can be kept in the system,with the increase of external stress, the nucleation and growth of parent at the twin interface is the main mechanism to realize the reorientation of 3→2 variants. After removing the loading, the vanished variant nucleates at the twin boundary to perform the redistribution of inner microstructure in the system. This kind of mechanism controls the shape memory effect of the MnCu alloy during the cyclic loading.