Evolution of microstructure and property of NiTi alloy induced by cold rolling

被引：43
作者：
Li, Y. [1 ]
Li, J. Y. [2 ]
Liu, M. [1 ]
Ren, Y. Y. [3 ]
Chen, F. [1 ]
Yao, G. C. [1 ]
Mei, Q. S. [1 ]
机构：
[1] Wuhan Univ, Sch Power & Mech Engn, Wuhan 430072, Peoples R China
[2] Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430023, Peoples R China
[3] Wuhan Univ, Sch Phys & Technol, Wuhan 430072, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 653卷
基金：
中国国家自然科学基金;
关键词：
NiTi alloy; Nanostructure; Cold rolling; Martensitic transformation; SEVERE PLASTIC-DEFORMATION; LOW-CARBON STEEL; TRANSFORMATION BEHAVIOR; TINI ALLOY; REFINEMENT; METALS;
D O I：
10.1016/j.jallcom.2015.09.056
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We investigated the combination effect of plastic deformation and phase transformation on the evolution of microstructure and property of NiTi alloy. Samples of Ni50.9Ti49.1 alloy were deformed by cold rolling to different strains/thickness reductions (4%-56%). X-ray diffraction, transmission electronic microscopy (TEM) and microhardness measurements were applied for characterization of the microstructure and property of the cold-rolled samples. Experimental results indicated the non-monotonic variations of microstructure parameters and mechanical property with strain, indicating the different processes in microstructure and property evolution of NiTi subjected to cold rolling. TEM observations further showed the dominating mechanisms of microstructure evolution at different strain levels, leading to the gradual reduction of grain size of NiTi to the nanoscale by cold rolling. The results were discussed and related to deformation of martensite, forward and reverse martensitic transformations and dynamic recrystallization. The present study provided experimental evidences for the enhanced formation of nanograins in NiTi by plastic deformation coupled with phase transformation. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：156 / 161
页数：6
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