THE EFFECT OF STRESS ON SOFT MODES FOR THE PHASE-TRANSFORMATION IN A TI-NI ALLOY .2. EFFECTS OF AGING AND THERMAL CYCLING ON THE PHASE-TRANSFORMATION

被引：38
|
作者：
LI, DY
WU, XF
KO, T
机构：
[1] Department of Materials Physics, University of Science and Technology Beijingn, Beijing
来源：
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES | 1991年 / 63卷 / 03期
关键词：
D O I：
10.1080/01418619108213902
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The softening of phonon modes is sensitive to stress. Both the internal tensile stress formed by Ti11Ni14 precipitates in Ni-rich Ti-Ni alloy and the internal stress introduced by thermal cycling in equiatomic Ti-Ni alloy have strong effects on the softening of phonon modes, especially on phonons with <111> polarization vectors which are closely related to the R-phase transformation. The increase in the amount of R phase is the main effect of ageing and thermal cycling Ti-Ni alloy; this results in remarkable improvement in the shape memory effect and the pseudo-elasticity of the material. The negative effect of a compressive stress on the R-phase transformation has been experimentally confirmed.
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页码：603 / 616
页数：14
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