The influence of carbon and oxygen content on the martensitic transformation temperatures and enthalpies of NiTi shape memory alloy

被引：63

作者：

Otubo, J. ^{[1
]}

Rigo, O. D. ^{[2
]}

Coelho, A. A. ^{[2
]}

Neto, C. M. ^{[1
]}

Mei, P. R. ^{[2
]}

机构：

[1] ITA, BR-12228900 Sao Jose Dos Campos, SP, Brazil

[2] Univ Estadual Campinas, BR-13083970 Campinas, SP, Brazil

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 481卷 / 639-642期

基金：

巴西圣保罗研究基金会;

关键词：

NiTiSMA; martensitic transformation temperature and enthalpy; impurities carbon and oxygen;

D O I：

10.1016/j.msea.2007.02.137

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The martensitic transformation temperatures and enthalpies of NiTi shape memory alloy strongly depend on the content of nickel and on carbon and oxygen impurities. Nickel stabilizes the high-temperature phase while carbon and oxygen enrich the surrounding matrix with nickel. In this work it is shown that, as a consequence, the martensitic transformation temperatures and enthalpy changes are lower than specially prepared low-contamination reference samples. Furthermore, the enthalpy changes increase linearly with increasing peak martensitic transformation temperature. This means that the lower the enthalpies, the lower is the peak martensitic transformation temperature suggesting that at some lower temperature no phase change should occur. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：639 / 642

页数：4

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