Effects of alloying elements on microstructure and coarsening behavior of Co-8.8Al-9.8W superalloys

doi:10.11817/j.ysxb.1004.0609.2021-37836

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	Effects of alloying elements on microstructure and coarsening behavior of Co-8.8Al-9.8W superalloys
	Xu, Yang-Tao 1,2,3; Li, Huai 2,3; Lou, De-Chao 2,3; Wang, Chen 2,3
刊名	Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals
	2021-06-28
卷号	31 期号:6 页码:1505-1515
关键词	Alloying Alloying elements Binary alloys Coarsening Cobalt alloys Grain boundaries Morphology Ostwald ripening Rate constants Superalloys Ternary alloys Titanium alloys Aging temperatures Aging time and temperatures Coarsening behavior Coarsening rates Phase morphology Secondary phase Secondary phase precipitation Spheroidization
ISSN号	10040609
DOI	10.11817/j.ysxb.1004.0609.2021-37836
英文摘要	With the changing of aging time and temperature, the microstructure, coarsening behavior of γ' phase and secondary phase precipitation of Co-8.8Al-9.8W-2X (X is Mo, Nb, Ta, Ti and Ni, mole fraction, %) superalloys were investigated by EFSEM. The effect of alloying elements on the coarsening behavior of γ' phase in the superalloys was analyzed. The result shows that the size of γ' phase increases with the increase of aging temperature and aging time in five alloys, and size of γ' phase follows LSW theory, but the volume fraction of γ' phase decreases obviously during aging process. The spheroidization of the γ' phase morphology of 2Mo and 2Ni alloys is observed during aging, while the cubic degrees of 2Nb, 2Ta and 2Ti alloys remain high. The coarsening rate curves of the five alloys are valley-shaped with increasing aging temperature, the coarsening rate is much higher at 930 than that at 870 . The coarsening rate constants of 2Ni, 2Ta and 2Ti alloys are lower at three aging temperatures, but at 930 , the coarsening rate constants of 2Ta and 2Ti alloys increase significantly. The secondary phase mainly precipitates at grain boundary, and DO19-Co3W phase is dominant, 2Ti alloy precipitates chained-like CoAl phase at grain boundary determined by EDS, which is irregular at grain boundary and needle like or irregular inside grain. © 2021, Science Press. 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/150744]
专题	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.Baiyin Research Institute of Novel Materials, Lanzhou University of Technology, Baiyin; 730900, China 2.School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou; 730050, China; 3.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China;
推荐引用方式 GB/T 7714	Xu, Yang-Tao,Li, Huai,Lou, De-Chao,et al. Effects of alloying elements on microstructure and coarsening behavior of Co-8.8Al-9.8W superalloys[J]. Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals,2021,31(6):1505-1515.
APA	Xu, Yang-Tao,Li, Huai,Lou, De-Chao,&Wang, Chen.(2021).Effects of alloying elements on microstructure and coarsening behavior of Co-8.8Al-9.8W superalloys.Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals,31(6),1505-1515.
MLA	Xu, Yang-Tao,et al."Effects of alloying elements on microstructure and coarsening behavior of Co-8.8Al-9.8W superalloys".Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals 31.6(2021):1505-1515.