Comparative study of R-phase martensitic transformations in TiNi-based shape memory alloys induced by point defects and precipitates

被引：14

作者：

Chang, P. C. ^{[1
]}

Ko, M. L. ^{[1
]}

Ramachandran, B. ^{[1
]}

Kuo, Y. K. ^{[1
]}

Chien, C. ^{[2
]}

Wu, S. K. ^{[2
]}

机构：

[1] Natl Dong Hwa Univ, Dept Phys, Hualien 97401, Taiwan

[2] Natl Taiwan Univ, Dept Mat Sci & Engn, Taipei 10617, Taiwan

来源：

INTERMETALLICS | 2017年 / 84卷

关键词：

Shape memory alloys; Martensitic transformation; Electrical properties; Thermal properties; Point defect; NI ALLOYS; MECHANICAL-PROPERTIES; STRAIN GLASS; TRANSITION; BEHAVIOR; TEMPERATURE; ORIGIN; HEAT; FE;

D O I：

10.1016/j.intermet.2017.01.008

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 studied the influence of point defects (Fe) and precipitates (Ti3Ni4) on the characteristics of R-phase martensitic transformation by comparing the transport and thermal properties of as-quenched Ti50Ni46Fe4 and annealed Ti48.7Ni51.3 shape memory alloys. Both alloys undergo a weak first-order R-phase transformation with a small thermal hysteresis (less than 7 K) and non-zero transformation strain, suggesting the introduction of point defects and precipitates lead to a stable R-phase in these alloys due to the defects induced local lattice deformations. Furthermore, our study revealed that the transition temperature, transformation width, and transformation strain of the investigated R-phase TiNi-based alloys are strongly affected by the induced defects. As a result, the annealed Ti48.7Ni51.3 has a higher transition temperature than that of Ti50Ni46Fe4, as expected. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：130 / 135

页数：6

共 38 条

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