Pt-Al涂层对DD413合金高温拉伸性能的影响  

Influence of Pt-Al Coating on Tensile Properties of DD413 Alloy at High Temperatures

作　　者：王迪 贺莉丽[3] 王栋 王莉[2] 张思倩[1] 董加胜[2] 陈立佳[1] 张健[2] WANG Di;HE Lili;WANG Dong;WANG Li;ZHANG Siqian;DONG Jiasheng;CHEN Lijia;ZHANG Jian(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;AECC Southern Industrial Limited Company,Zhuzhou 412000,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870 [2]中国科学院金属研究所师昌绪先进材料创新中心,沈阳110016 [3]中国航发南方工业有限公司,株洲412000

出　　处：《金属学报》2023年第3期424-434,共11页Acta Metallurgica Sinica

基　　金：国家科技重大专项项目Nos.P2021-A-Ⅳ-001-002,2017-Ⅵ-0019-0091和J2019-Ⅵ-0010-0124;国家自然科学基金项目No.51771204。

摘　　要：利用SEM和TEM对比研究了无涂层和Pt-Al涂层试样在760和980℃的拉伸性能。研究结果表明:在2个温度下,Pt-Al涂层试样的屈服强度均低于无涂层试样。由于Pt-Al涂层存在韧脆转变温度(ductile to brittle transition temperature,DBTT),因此在不同温度下涂层表现出不同的变形机制和裂纹萌生方式。在高温下由于β向γ′转变有利于位错产生滑移,从而导致Pt-Al涂层的塑性变形。Pt-Al涂层在DBTT以上拉伸强度的提高是由于Pt在β-NiAl相中起到固溶强化效应。The Pt-Al coating is a vital section of aero-engine power blades that can improve the operating temperature of the blade.The blade is subjected to axial tensile stress during operation.Both the oxidation of the Pt-Al coating and the microstructure evolution caused by the element diffusion between the coating and the matrix at high temperatures affect the service performance of the blade.However,the specific mechanisms remain unclear.In this work the effect of Pt-Al coating on the tensile properties of a DD413 alloy was studied.SEM and TEM were used to compare the tensile properties of the uncoated and Pt-Al-coated samples,respectively,at 760 and 980oC.Lower yield strength was detected in Pt-Alcoated samples than that in uncoated samples at 760 and 980oC.The different crack initiation modes and deformation mechanisms of Pt-Al coating at 760 and 980oC mainly result from the ductile to brittle transition temperature(DBTT).At high temperatures,the transition fromβtoγ′is conducive to the dislocation slip,which leads to the plastic deformation of the Pt-Al coating.The increase in the tensile strength of the Pt-Al layer above DBTT can be attributed to the solidified solution-strengthening effect of Pt inβ-NiAl.

关 键 词：Pt-Al涂层 单晶高温合金 拉伸性能 韧脆转变温度 

分 类 号：TG141[一般工业技术—材料科学与工程]