Stability of NiCrAlY coating/titanium alloy system under pure thermal exposure

被引：0
|
作者：
Xiao-Min Peng
An-Ru Wu
Li-Jun Dong
You-Rui Tao
Wei-Guo Gao
Xiang-Lin Zhou
机构：
[1] University of Science and Technology Beijing,State Key Laboratory of Advanced Metals and Materials
[2] Hunan Institute of Engineering,School of Mechanical Engineering
来源：
Rare Metals | 2017年 / 36卷
关键词：
NiCrAlY coating; Titanium alloy; Stability; Pure thermal exposure; Degradation;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
In this paper, NiCrAlY coating was deposited on TC4 titanium alloy using arc ion plating, and the stability of NiCrAlY coating/TC4 substrate system under pure thermal exposure was analyzed in a wide temperature range. During the thermal exposure, β → γ′ → γ phase transformation takes place in the NiCrAlY coating. The NiCrAlY coating phases totally decompose above the allotropic transformation temperature of TC4. The allotropic transformation of α-Ti to β-Ti of the substrate significantly influences the stability of NiCrAlY coating/TC4 substrate system. NiCrAlY coating elements are mainly consumed by interfacial reactions below the allotropic transformation temperature of TC4. Above the allotropic transformation temperature of TC4, NiCrAlY coating elements are mainly consumed by element dissolution in β-Ti. The NiCrAlY coating totally degrades for the dissolution of coating elements in the substrate to form thick β-Ti stabilized layer.
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页码：659 / 665
页数：6
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