In situ investigation of the fast microstructure evolution during electropulse treatment of cold drawn NiTi wires

被引：74
作者：
Malard, B. [1 ,4 ]
Pilch, J. [1 ]
Sittner, P. [1 ]
Delville, R. [2 ]
Curfs, C. [3 ]
机构：
[1] Inst Phys, Prague 18221, Czech Republic
[2] Univ Antwerp, EMAT, B-2020 Antwerp, Belgium
[3] European Synchrotron Radiat Facil, F-38043 Grenoble, France
[4] SIMaP, F-38402 St Martin Dheres, France
来源：
ACTA MATERIALIA | 2011年 / 59卷 / 04期
关键词：
Shape memory alloys; Recovery; Recrystallization; Joule heating; Superelasticity; ELECTRIC-CURRENT; PHASE-TRANSFORMATIONS; TI WIRES; ALLOY; NANOCRYSTALLIZATION; AMORPHIZATION;
D O I：
10.1016/j.actamat.2010.11.018
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Microstructural changes taking place during the heat treatment of cold-worked NiTi alloy are of key interest in shape memory alloy technology, since they are responsible for setting the austenite shape and functional properties of the heat-treated alloy. In this work, microstructural evolution during non-conventional electropulse heat treatment of thin NiTi filaments was investigated in a unique high-speed in situ synchrotron X-ray diffraction experiment with simultaneous evaluation of the tensile force and electrical resistivity of the treated wire. The in situ results provide direct experimental evidence on the evolution of the internal stress and density of defects during fast heating from 20 degrees C to similar to 700 degrees C. This evidence is used to characterize a sequence of dynamic recovery and recrystallization processes responsible for the microstructure and superelastic functional property changes during the electropulse treatments. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：1542 / 1556
页数：15
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