Evolution of internal stresses during cyclic superelastic deformation of NiTi investigated by X-ray synchrotron diffraction

被引：4

作者：

Sedmak, P. ^{[1
]}

Sittner, P. ^{[2
]}

Pilch, J. ^{[2
]}

Curfs, C. ^{[3
]}

机构：

[1] Czech Tech Univ, FNSPE, Prague 12000, Czech Republic

[2] AS CR, Inst Phys, Slovance 1999-2, Prague 18221, Czech Republic

[3] ESRF European Synchrotron, F-38000 Grenoble, France

来源：

MATERIALS TODAY-PROCEEDINGS | 2015年 / 2卷

关键词：

shape memory alloy; NiTi; martensitic transformation; cyclic deformation; x-ray diffraction; SHAPE-MEMORY ALLOYS; TRANSFORMATION; POLYCRYSTALS; WIRES;

D O I：

10.1016/j.matpr.2015.07.386

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Cyclic tensile superelastic deformation of NiTi was investigated using high resolution in-situ synchrotron x-ray diffraction method. Diffraction patterns were recorded under applied stress prior and after the stress induced martensitic transformation, analyzed and interpreted in view of the evolution of microstructure in the transforming polycrystal. A simple bicrystal scheme of the polycrystal transformation is used to rationalize the experimental evidence on microstructure evolution during cycling. It is claimed that the instability of cyclic superelastic response of NiTi is due to the gradual rise of internal stresses originating from the accumulation of plastic deformation accompanying the martensitic transformation in constrained polycrystalline environment. (C) 2015 The Authors. Published by Elsevier Ltd.

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页码：731 / 734

页数：4

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