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Preparation of TiNi films by diffusion technology and the study of the formation sequence of the intermetallics in Ti–Ni systems

Published online by Cambridge University Press:  24 September 2014

Xi Shao ,
Xianglong Guo ,
Yuanfei Han ,
Zhengjie Lin ,
Jining Qin ,
Weijie Lu  and
Di Zhang
Xi Shao
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Xianglong Guo*
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Yuanfei Han
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Zhengjie Lin
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Jining Qin
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Weijie Lu
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Di Zhang
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
*
a)Address all correspondence to this author. e-mail: guoxiaglong@sjtu.edu.cn
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Abstract

This study presented a novel fabrication process for TiNi thin films by vacuum diffusion technology using reactive Ni/Ti/Ni multilayer thin films. The sandwiched thin films were prepared by chemical nickel plating. Ni/Ti/Ni multilayer films were heat treated for various diffusion times and temperatures and the influences of the temperature and diffusion time on the interdiffusion behavior of the Ti–Ni system were researched in detail. The results showed that a homogeneous TiNi thin film was obtained at 1173 K with a diffusion time of 4 h. Moreover, the formation sequence of the intermetallics in the Ti–Ni diffusion system was investigated by thermodynamic analysis and experiment. It was found that three compounds – TiNi3, Ti2Ni, and TiNi – formed in the diffusion process at the Ti/Ni interfaces. More importantly, the nucleation of TiNi3 and Ti2Ni was prior to that of TiNi because of the lower reaction Gibbs free energy and increasing interface energy of TiNi3 and Ti2Ni.

Keywords

alloydiffusionthin films
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 22 , 28 November 2014 , pp. 2707 - 2716
Copyright
Copyright © Materials Research Society 2014 

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References

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