期刊
SHAPE MEMORY AND SUPERELASTICITY
卷 3, 期 4, 页码 335-346出版社
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.1007/s40830-017-0117-0
关键词
Shape memory alloys; Martensitic phase transformation; Cyclic degradation; Internal friction; Functional fatigue
资金
- Deutsche Forschungsgemeinschaft [NI 1327/7-1, KR 4855/1-1]
- Ministry of Science and Education of Russian Federation [16.6554.2017/6.7]
In the present study, functional fatigue behavior of a near aOE (c) 001 >-oriented Fe-Mn-Al-Ni single crystal was investigated under tensile load. An incremental strain test up to 3.5% strain and cyclic tests up to 25 cycles revealed rapid pseudoelastic degradation. Progressive microstructural degradation was studied by in situ scanning electron microscopy. The results show a partially inhibited reactivation of previously formed martensite and proceeding activation of untransformed areas in subsequent cycles. The preferentially formed martensite variants were identified by means of Schmid factor calculation and the Kurdjumov-Sachs relationship. Post mortem transmission electron microscopy investigations shed light on the prevailing degradation mechanisms. Different types of dislocations were found promoting the progressive degradation during cyclic loading.
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