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

作　　者：Xiao-Min Peng An-Ru Wu Li-Jun Dong You-Rui Tao Wei-Guo Gao Xiang-Lin Zhou 

机构地区：[1]State Key Laboratory of Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China [2]School of Mechanical Engineering,Hunan Institute of Engineering,Xiangtan 411101,China

出　　处：《Rare Metals》2017年第8期659-665,共7页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.51101054);the Foundation of State Key Laboratory of Advanced Metals and Materials(No.2012-Z03);Hunan Provincial Natural Science Foundation of China(No.14JJ3132)

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′→γphase transformation takes place in the NiCrAlY coating.The NiCrAlY coating phases totally decompose above the allotropic transformation temperature of TC4.The allotropic transformation ofα-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 thickβ-Ti stabilized layer.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′→γphase transformation takes place in the NiCrAlY coating.The NiCrAlY coating phases totally decompose above the allotropic transformation temperature of TC4.The allotropic transformation ofα-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 thickβ-Ti stabilized layer.

关 键 词：NiCrAlY coating Titanium alloy STABILITY Pure thermal exposure DEGRADATION 

分 类 号：TQ153[化学工程—电化学工业]