CRYSTAL-TO-AMORPHOUS TRANSFORMATION OF NITI INDUCED BY COLD-ROLLING

被引:154
作者
KOIKE, J [1 ]
PARKIN, DM [1 ]
NASTASI, M [1 ]
机构
[1] UNIV CALIF LOS ALAMOS SCI LAB, DIV MAT SCI & TECHNOL, LOS ALAMOS, NM 87545 USA
关键词
D O I
10.1557/JMR.1990.1414
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A NiTi intermetallic compound was cold rolled at room temperature by 30% and 60% thickness reductions, and microstructures were studied by means of transmission electron microscopy (TEM). In the cold-rolled samples we observed both a phase of nanometer-sized crystals and an amorphous phase. A substantially high dislocation density, 1013 to 1014/cm2, was evident in the transition region between crystalline and amorphous phases. A simple estimate of the elastic energy arising from this dislocation density is of the same order as the crystallization energy, suggesting that dislocation accumulation is a major driving force for amorphization in cold-rolled NiTi. © 1990, Materials Research Society. All rights reserved.
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页码:1414 / 1418
页数:5
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