Microstructure and mechanical properties of cold-rolled Ti50Ni47Fe3 shape memory alloy

被引：10
作者：
Li, Yan-feng [1 ]
Kang, Xiao-yu [1 ]
Yin, Xiang-qian [1 ]
Xie, Hao-feng [1 ]
Mi, Xu-jun [1 ]
机构：
[1] Gen Res Inst Nonferrous Met, State Key Lab Nonferrous Met & Proc, Beijing 100088, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2014年 / 24卷 / 09期
基金：
中国国家自然科学基金;
关键词：
TiNiFe alloy; shape memory alloy; cold rolling; microstructure; mechanical property; MARTENSITIC-TRANSFORMATION; NI; BEHAVIOR; PHASE; HEAT;
D O I：
10.1016/S1003-6326(14)63423-3
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Mechanical and shape memory properties of a Ti50Ni47Fe3 alloy annealed at 450-750 degrees C for 1 h after a cold-rolled reduction of 25% were investigated by phase transformation analysis and microstructure characterization using tensile tests, Vickers hardness tests, electrical resistivity-temperature tests, SEM and TEM. From the results of the tensile, it can be inferred that the fracture stress and yield stress decreased and the fracture elongation increased as the annealing temperature increased for the rolled Ti50Ni47Fe3 alloy. They reached stead values when the temperature was above 650 degrees C. The change in Vickers hardness corresponded to the change in the fracture stress and yield stress. The electrical resistivity-temperature curves suggest that a two-stage martensitic transformation (B2-R-B19') occurred during cooling and heating. The transformation temperatures decreased to lower temperatures when the annealing temperature was increased and maintained the same after the annealing temperature reached 650 degrees C. TEM revealed the distinct processes occurring at elevated temperatures: recovery, polygonization, and recrystallization.
引用
收藏
页码：2890 / 2895
页数：6
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