Effects of tantalum content on strengthening phase and high temperature oxidation behavior of Co-Al-W superalloy

	Effects of tantalum content on strengthening phase and high temperature oxidation behavior of Co-Al-W superalloy
	Xu, Yang-Tao 1,2; Sha, Qi-Zhen 1,2; Xia, Tian-Dong 1,2
刊名	Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals
	2016-02-01
卷号	26 期号:2 页码:302-309
关键词	Activation energy Alloying elements Alumina Aluminum oxide Cobalt alloys Cobalt compounds Oxide films Phase separation Precipitation (chemical) Superalloys Tantalum Tantalum alloys Tantalum oxides Ternary alloys Thermooxidation Alloy design theory Antioxidant capacity Cobalt-based superalloy Element distribution High temperature oxidation Behavior Oxidation activation energy Precipitation behavior Precipitation strengthening
ISSN号	10040609
英文摘要	With the precipitation strengthening phase of ternary compound γ′-Co3(Al, W), Co-Al-W superalloy is a novel cobalt-based superalloy. In order to study the effects of alloying element tantalum on the strengthening phase and high temperature oxidation behavior of Co-8.8Al-9.8W superalloy, the phase composition, the amount of strengthening phase and precipitation behavior of μ phase of Co-8.8Al-9.8W superalloy with different tantalum contents were investigated with d electrons alloy design theory and XRD analysis. Then the composition, microstructure and element distribution of the high temperature oxide films of Co-8.8Al-9.8W superalloy with different tantalum contents were studied by SEM and EDAX methods. And the activation energy of Co-8.8Al-9.8W superalloy with different tantalum content was calculated. The results show that with tantalum content increasing, the number of γ′ strengthening phase of the Co-Al-W superalloy increases and the μ phase separation is inhibited. The oxide film of Co-8.8Al-9.8W-xTa (x=0, 0.5, 1, 1.5, 2) superalloy mainly consists of three layers, the outermost layer mainly is cobalt oxide, the intermediate layer is tungsten, aluminum and tantalum complex oxides, and the inner layer is made up of aluminum oxide. Tantalum element improves the density and stability of oxide film of aluminum oxide. The oxide film of 1.5Ta superalloy has the best compactness and stability, and the 1.5Ta superalloy has the highest oxidation activation energy and the strongest antioxidant capacity. © 2016, Central South University of Technology. All right reserved.
语种	中文
出版者	Central South University of Technology
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/112503]
专题	材料科学与工程学院兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室
作者单位	1.School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou; 730050, China 2.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metal, Lanzhou University of Technology, Lanzhou; 730050, China;
推荐引用方式 GB/T 7714	Xu, Yang-Tao,Sha, Qi-Zhen,Xia, Tian-Dong. Effects of tantalum content on strengthening phase and high temperature oxidation behavior of Co-Al-W superalloy[J]. Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals,2016,26(2):302-309.
APA	Xu, Yang-Tao,Sha, Qi-Zhen,&Xia, Tian-Dong.(2016).Effects of tantalum content on strengthening phase and high temperature oxidation behavior of Co-Al-W superalloy.Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals,26(2),302-309.
MLA	Xu, Yang-Tao,et al."Effects of tantalum content on strengthening phase and high temperature oxidation behavior of Co-Al-W superalloy".Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals 26.2(2016):302-309.