Effect of nickel content on equilibrium phases in Co-8.8Al-9.8W superalloy with thermodynamic calculation

doi:10.19476/j.ysxb.1004.0609.2019.11.10

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	Effect of nickel content on equilibrium phases in Co-8.8Al-9.8W superalloy with thermodynamic calculation
	Xu, Yang-Tao 1,2; Ma, Hong-Li 1,2
刊名	Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals
	2019-11-01
卷号	29 期号:11 页码:2533-2539
关键词	Aluminum alloys Computer software Precipitation (chemical) Superalloys Temperature Ternary alloys Tungsten alloys Co-based superalloys Nucleation and growth Precipitation temperature Secondary phase Supercooling degrees Thermodynamic behaviors Thermodynamic calculations Thermodynamic simulations
ISSN号	10040609
DOI	10.19476/j.ysxb.1004.0609.2019.11.10
英文摘要	In order to study the effect of Ni element on the precipitation of new Co-based superalloy, a research about the thermodynamic behavior of equilibrium phase precipitation of the Co-8.8Al-9.8W alloy with different Ni content was conducted based on JMatPro thermodynamic simulation software. The results show that with the increase of Ni content, the precipitation temperature of γ phase decreases, and the amount of precipitation decreases. Compared with 0Ni alloy, the precipitation temperature of γ phase in 25Ni alloy decreases by 11.63, and the precipitation amount of γ phase in 35Ni alloy decreases by 20.63% at 600. The precipitation temperature of μ-Co7W6 phase increases, and the precipitation temperature of 35Ni alloy increases by 303.73 compared with that of 0Ni alloy. While the η-Co3Al phase will disappear. The precipitation temperature of γ' phase increases and the amount of precipitation increases. Compared with 5Ni alloy, the precipitation temperature at 35Ni increases by 392.85 and the precipitation amount at 600 increases by 40.9%. From the view of the precipitation of each phases the and the influence of Ni on the elements in equilibrium phase, we can see that as the increasing of Ni content, the contents of elements in solid phase and liquid phase become more and more different when the γ phase precipitates. Only by decreasing the temperature or increasing the supercooling degree the precipitation and growth of γ phase can be satisfied. As a result, the content of γ phase became less and less, and the precipitation temperature is also lower and lower. The Ni element added in the alloy inhibits the formation and growth of η-Co3Al phase in a form of generating γ' phase, which eventually leads to the disappearance of η phase. W and Al precipitated from γ phase provide nucleation and growth conditions for μ-Co7W6 and η-Co3Al, respectively. However, after the disappearance of η-Co3Al phase, Al and Ni precipitated from γ phase provide conditions for the formation of γ' phase, and then the γ' phase begins to generate and increase. © 2019, 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/150477]
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.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China; 2.School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Xu, Yang-Tao,Ma, Hong-Li. Effect of nickel content on equilibrium phases in Co-8.8Al-9.8W superalloy with thermodynamic calculation[J]. Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals,2019,29(11):2533-2539.
APA	Xu, Yang-Tao,&Ma, Hong-Li.(2019).Effect of nickel content on equilibrium phases in Co-8.8Al-9.8W superalloy with thermodynamic calculation.Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals,29(11),2533-2539.
MLA	Xu, Yang-Tao,et al."Effect of nickel content on equilibrium phases in Co-8.8Al-9.8W superalloy with thermodynamic calculation".Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals 29.11(2019):2533-2539.