Stress-induced phase transformations in thermally cycled superelastic NiTi alloys: in situ X-ray diffraction studies

被引:13
作者
Polatidis, Efthymios [1 ]
Zotov, Nikolay [1 ]
Mittemeijer, Eric J. [1 ,2 ]
机构
[1] Max Planck Inst Intelligent Syst, D-70569 Stuttgart, Germany
[2] Univ Stuttgart, Inst Mat Sci, D-70569 Stuttgart, Germany
关键词
NiTi; SMA; in situ XRD; martensitic transformation; SHAPE-MEMORY ALLOYS; LUDERS-LIKE DEFORMATION; TI-NI; NEUTRON-DIFFRACTION; MARTENSITIC TRANSFORMATIONS; SYNCHROTRON-RADIATION; POLYCRYSTALLINE NITI; STRAIN; PSEUDOELASTICITY; BEHAVIOR;
D O I
10.1017/S0885715614001456
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
In situ laboratory-based and in situ synchrotron X-ray diffraction techniques were employed to study quantitatively the strain-induced austenite-to-martensite (A-M) transformation in thermally cycled (TC) superelastic NiTi alloys. The propagation of the A-M interfaces and the evolution of the microstructure were traced during uniaxial tensile loading. It was shown that the TC material exhibits localized transformation via the propagation of transformation bands. The amount of the martensite phase depends approximately linearly on the applied strain. Analysis of the broadening of the austenite diffraction lines indicates the presence of highly deformed austenite grains within the transformation bands. Analysis of the austenite diffraction-line shifts indicates that the overall lattice strain in the (retained) austenite in the transformation bands differs from that of the austenite in the adjacent untransformed regions. (C) 2015 International Centre for Diffraction Data.
引用
收藏
页码:S76 / S82
页数:7
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