Transformation temperature changes due to second phase precipitation in NiTi-based shape memory alloys

被引：62

作者：

Zarinejad, Mehrdad ^{[1
]}

Liu, Yong ^{[1
]}

Tong, Yunxiang ^{[2
]}

机构：

[1] Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore 639798, Singapore

[2] Harbin Engn Univ, Coll Mat Sci & Chem Engn, Ctr Biomed Mat & Engn, Harbin 150001, Peoples R China

来源：

INTERMETALLICS | 2009年 / 17卷 / 11期

关键词：

Intermetallics; miscellaneous; Martensitic transformations; Precipitates; Electronic structure of metals and alloys; Phase stability; prediction; MARTENSITIC-TRANSFORMATION; ELASTIC-CONSTANTS; BEHAVIOR;

D O I：

10.1016/j.intermet.2009.03.022

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：

This study investigated changes in the martensite start temperature (M-s) of NiTi-based shape memory alloys as a result of second phase precipitation. Precipitation of the second phase leads to a change in the matrix chemical composition and may alter the electron concentration (c(v)) of the matrix. When the electron concentration of the matrix increases, the transformation temperature decreases, whereas the M-s temperature rises when the c(v) of the matrix decreases. Additionally, if the precipitation does not result in a significant variation of the c(v) of the matrix, the variation in M-s is small (<15 degrees C). In the present work it is shown that alteration of the M-s temperature as a result of precipitation is mainly due to the change in electron concentration of the matrix. The extrinsic effect of the precipitates on M-s is also discussed on the basis of their quantities in the as-quenched and aged microstructures and the strain energy induced in the matrix. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：914 / 919

页数：6

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