Effects of Nickel Content on Microstructural Evolution and gamma' Dissolution of Co-8.8Al-9.8W Base Alloys

	Effects of Nickel Content on Microstructural Evolution and gamma' Dissolution of Co-8.8Al-9.8W Base Alloys
	Xu Yangtao 1,2; Xia Rongli 1,2; Lou Dechao 1,2
刊名	RARE METAL MATERIALS AND ENGINEERING
	2017-08
卷号	46 期号:8 页码:2288-2293
关键词	nickel element Co-Al-W base superalloy gamma' phase microhardness
ISSN号	1002-185X
英文摘要	To study the effects of nickel contents (5%, 15%, 25% and 35%, atomic fraction) on microstructural evolution and gamma' dissolution behavior of Co-Al-W base alloys, the gamma' phase microstructural evolution, gamma' phase transformation temperatures and microhardness of Co-Al-W base alloys with aging treatment were analyzed using scanning-electron microscope (SEM) and X-ray diffraction (XRD) etc. Results show that with the increasing of Ni content, gamma' solvus temperature increases at different degrees and the volume fraction of gamma' phase increases gradually. When the nickel content in Co-8.8Al-9.8W alloy reaches 25%, gamma' phase transformation temperature increases to 1100 C. The solidus temperatures and gamma' phase morphology of the four Co-Al-W base alloys are nearly unchanged. The typical gamma/gamma' two-phase microstructure is generated in the four alloys after the heat treatment at 900 degrees C for 50 h. After aging at 900 degrees C for 100 h, the gamma' phase volume fraction decreases and the gamma' phase is obviously coarsened. The microhardness of the four alloys after heat treatment at 900 degrees C for 50 and 100 h indicates that the microhardness is raised from 5Ni alloy to 15Ni alloy, but is lowered when further increasing the Ni content. With the aging treatment time from 50 h to 100 h, the volume fraction of gamma' phase decreases and y' phase coarsens, which reduces the hardness of Co-8.8Al-9.8W-based alloy.
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	中文
出版者	NORTHWEST INST NONFERROUS METAL RESEARCH
WOS记录号	WOS:000409396900044
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/33159]
专题	材料科学与工程学院省部共建有色金属先进加工与再利用国家重点实验室
通讯作者	Xu Yangtao
作者单位	1.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Gansu, Peoples R China 2.Lanzhou Univ Technol, Sch Mat Sci & Engn, Lanzhou 730050, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Xu Yangtao,Xia Rongli,Lou Dechao. Effects of Nickel Content on Microstructural Evolution and gamma' Dissolution of Co-8.8Al-9.8W Base Alloys[J]. RARE METAL MATERIALS AND ENGINEERING,2017,46(8):2288-2293.
APA	Xu Yangtao,Xia Rongli,&Lou Dechao.(2017).Effects of Nickel Content on Microstructural Evolution and gamma' Dissolution of Co-8.8Al-9.8W Base Alloys.RARE METAL MATERIALS AND ENGINEERING,46(8),2288-2293.
MLA	Xu Yangtao,et al."Effects of Nickel Content on Microstructural Evolution and gamma' Dissolution of Co-8.8Al-9.8W Base Alloys".RARE METAL MATERIALS AND ENGINEERING 46.8(2017):2288-2293.