期刊
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
卷 20, 期 4-5, 页码 517-521出版社
SPRINGER
DOI: 10.1007/s11665-011-9853-z
关键词
amorphous; nanocrystalline; shape memory alloy; superelasticity
The microstructures and mechanical properties of amorphous/nanocrystalline hybrid TiNi wires produced by severe cold drawing were investigated. Annealed wires of Ti-50.9 mol%Ni and Ti-41 mol%Ni-8.5 mol%Cu were subjected to severe cold drawing of 50-70% reduction. The as-drawn TiNi wires were composed of the mixture of amorphous phase and predominantly B2 nanocrystalline phase. Young's modulus increased with the drawing reduction which can be attributed to the increase in the amount of amorphous phase. For the binary TiNi wires, the volume fraction of amorphous phase was estimated to be about 60% from Young's modulus and electrical resistivity. The wires drawn over 60% exhibited peculiar large linear elastic strain which is quite different from superelasticity. Aging at 573 K led to an increase in tensile elongation as well as in the recoverable strain. The amorphization by cold drawing was also confirmed for Ti-41 mol%Ni-8.5 mol%Cu in 62% drawn wires.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据