两种新型含锇镍基单晶高温合金的相稳定性

doi:10.19976/j.cnki.43-1448/TF.2024097

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Abstract Two nickel-based single crystal superalloys, CSUSX-Os-1 and CSUSX-Os-2, with Os mass fraction of 3% and different Co/Cr mass ratios (6.5∶9.6, 9.6∶6.5), were prepared using vacuum induction melting and rapid solidification techniques. After solution and aging treatment, the alloys were thermal exposed at 1 100, 1 150, and 1 200 ℃ for different time to investigate the effects of thermal exposure time and temperature on the microstructure of the alloys. The precipitation tendency of TCP phases was predicted using the electron vacancy method and the d-orbital electron energy level prediction method. The results show that the γ′ phases in both alloys coarsen with the increase of thermal exposure temperature and the extension of thermal exposure time, and the area fraction of γ' phase of CSUSX-Os-1 alloy is smaller than that of CSUSX-Os-2 alloy at the same thermal exposure temperature. The CSUSX-Os-1 alloy exhibits greater tendency for TCP phase precipitation than the CSUSX-Os-2 alloy. Moreover, the compositions of the TCP phases precipitated in the two alloys are different, the TCP phases in the CSUSX-Os-1 alloy enrich in Cr, W, Os, and Ni, and the size of the lath-shaped TCP phases gradually increases with the increase of thermal exposure time; the TCP phases in the CSUSX-Os-2 alloy enrich in Ta, Ti, and W, and also has a lath-shaped morphology.

Key words： nickel-based single crystal superalloy thermal exposure TCP phase γ′ phase phase stability

Received: 20 September 2024 Published: 15 April 2025

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	HU Xiuyi
	ZHANG Lijun
	ZHOU Kechao
	HUANG Zaiwang

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HU Xiuyi,ZHANG Lijun,ZHOU Kechao, et al. Phase stability of two new osmium-containing nickel-based single crystal superalloys[J]. Materials Science and Engineering of Powder Metallurgy, 2025, 30(2): 107-114.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2024097 OR http://pmbjb.csu.edu.cn/EN/Y2025/V30/I2/107

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