Study on electronic structure and microdefects by positron annihilation spectroscopy for NiTi alloys

被引：0
|
作者：
Hu Yifeng [1 ]
Deng Wen
Chen Zhenying
机构：
[1] Jiangsu Teachers Univ Technol, Changzhou 213001, Peoples R China
[2] Guangxi Univ, Nanning 530004, Peoples R China
来源：
RARE METAL MATERIALS AND ENGINEERING | 2007年 / 36卷 / 06期
关键词：
NiTi alloy; Doppler-broading spectra; W parameter; microdefect;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Doppler-broading spectrum of positron annihilation radiation have been measured by using 2-detector coincidence technique for pure metals of Si, Ni, Ti and NiTi alloys with five different chemical compositions. The W parameters of NiTi alloys are calculated. The experimental results show that some 3d electrons are localized to form covalent bonds when Ni and Ti atoms aggregate to form NiTi alloy, decreasing the free electrons in metal bonds. The covalent bonds and metal bonds coexist in NiTi alloy. The Ni-49at%Ti alloy has the biggest W parameter, indicating that the quantity of defects is least in this component alloy. This may be the reason why the Ni-49at%Ti alloy has the best shape memory effect.
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页码：985 / 988
页数：4
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