Design of novel NiSiAlY alloys in marine salt-spray environment:PartⅠ.Al-Si-Y and Ni-Si-Y subsystems  

作　　者：Kai Xu Keke Chang Yong Du Liping Wang 

机构地区：[1]Key Laboratory of Marine Materials and Related Technologies,Zhejiang Key Laboratory of Marine Materials and Protective Technologies,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo,315201,China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing,100049,China [3]State Key Laboratory of Powder Metallurgy,Central South University,Changsha,410083,China

出　　处：《Journal of Materials Science & Technology》2021年第29期66-78,共13页材料科学技术（英文版）

基　　金：financial support from the National Natural Science Foundation of China(51971235);Natural Science Foundation of Zhejiang Province(LQ20E010004);National Science and Technology Major Project(2017-VII-0012-0107);Ningbo 3315 Innovation Team(No.2019A-18-C);CAS Pioneer Hundred Talents Program are greatly acknowledged。

摘　　要：MCrAlY(M=Ni,Co,NiCo)alloys have been widely used as a bond layer for thermal barrier coatings(TBCs).However;oxides form discontinuously on MCrAlY surface in the marine environment since Cr_(2)O_(3)can react with NaCl and H_(2)O at temperatures above 500℃.Replacing Cr with other alloying elements(such as Si)might prevent severe salt-spray corrosion effectively.To save time and efforts in materials design of the Ni-Si-Al-Y system;we obtained the thermodynamic descriptions of the ternary compounds by coupling the CALPHAD(CALculation of PHAse Diagrams)approach and first-principles calculations.Seven and eighteen ternary compounds were evaluated and calculated in the Al-Si-Y and Ni-Si-Y systems;respectively.Phase diagrams of the two systems were depicted after a series of experimental Al/Ni-Si-RE(RE denotes rare earth elements,including La,Ce,Pr,Nd,Sm,Gd,Dy,Ho,and Er)systems being analyzed.It is found that the RE elements with the same reference states tend to form ternary compounds with the same crystal structures.The model-based descriptions are the basis for the research and development of novel NiSiAlY alloys in resisting high-temperature corrosion.

关 键 词：Ternary compounds NiSiAlY CALPHAD Formation enthalpy Rare earth elements 

分 类 号：TG174.4[金属学及工艺—金属表面处理]