Microstructures and cohesiveness of alkali- and heat-treated films on a Ti-15Zr-4Nb-4Ta alloy

被引：1
|
作者：
Kobayashi, S. [1 ]
Murakami, K. [2 ]
Nakai, K. [1 ]
Hino, M. [2 ]
机构：
[1] Ehime Univ, Dept Mat Sci & Engn, 3 Bunkyo Cho, Matsuyama, Ehime 7908577, Japan
[2] Ind Technol Ctr, Okayama 7011296, Japan
来源：
THERMEC 2006, PTS 1-5 | 2007年 / 539-543卷
关键词：
titanium alloy; coating; alkali treatment; heat treatment; scratch test; microstructure;
D O I：
10.4028/www.scientific.net/MSF.539-543.3706
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Microstructures of alkali- and/or heat-treated films on a Ti-15Zr-4Nb-4Ta alloy were analyzed by means of scanning electron microscopy, thin film X-ray diffraction and Auger electron spectroscopy. The cohesiveness of films was also evaluated by scratch tests. The films were formed by immersion in 5M aqueous NaOH solution at 60 degrees C for 86.4 ks (alkali treatment) followed by heating at 400-600 degrees C for 3.6 ks. The film on alloy formed by alkali treatment exhibits the same strucutre as that formed on an alkali-treated titanium. Compositional gradient of alloying elements, Zr, Nb and Ta, is detected in the film. The cohesion of alkali-treated film is considerably increased by the heat treatment, and the maximum cohesion is obtained by heating at 600 degrees C. The increase in cohesion of alkali-treated film by heat treatment is due to both the diffusion of Zr into film and the formation of sodium titanate on substrate.
引用
收藏
页码：3706 / +
页数：2
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