一种镍基单晶合金高温蠕变期间的变形特征及元素分布

doi:10.11896/cldb.21080216

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Abstract Through a high-temperature creep performance test, microstructure observation, and three-dimensional atom probe composition analysis of a 6%Re/5%Ru (mass fraction) single-crystal nickel-based alloy, the element distribution before and after the alloy creep under high temperatures and the deformation characteristics during creep were studied. The results showed that the Al and Ta elements were mainly distributed in γ' phase of the alloy after complete heat treatment. After creep fracture at 1 120 ℃/165 MPa, the distribution of elements in γ/γ' phase changed. Among them, the concentration of Al, Ta, Cr and Co in the γ/γ' two phases was reduced due to oxidation. In addition, some Re, Ru, W and Mo atoms were expelled from γ' and enriched on the side of the γ matrix near the γ/γ' phase transition region, which could cause the lattice distortion to increase the resistance of dislocations motion and delay the shearing of dislocations into the γ' phase. It was one of the reasons why Re/Ru alloys have better high temperature creep resistance. In the later creep stage, the dislocations of shearing into γ' phase may cross-slid from {111} to {100} planes to form the K-W dislocation locks, and the K-W dislocation locks with more amount may inhibit the sliding and cross-sliding of dislocations to improve the resistance of alloy, which was thought to be one of the reasons of the alloy having better creep resistance.

Key words： single crystal nickel-based superalloy 6%Re/5%Ru atom probe concentration distribution K-W lock

Published: 25 February 2022 Online: 2022-02-28

CLC number:

TG115.9

Fund:Projects of Liaoning Natural Science Foundation (2020-Ms-212), Science and Technology Foundation Project of Guizhou Province (qiankehejichu[2020]1Y198, qiankehezhicheng[2019]2870,qiankehejichu[2018]1055), Science and Technology Project of Bijie City (bikehezi[2019]2), Youth Science and Technology Growth Project of Guizhou Province (qianjiaoheKYzi[2022]121,qianjiaoheKYzi[2020]145,qianjiaoheKYzi[2018]400,qianjiaoheKYzi[2019]156), Bijie City Joint Fund Project (bikelianheziG[2019]9,bikelianheziG[2019]25), and Characteristic Key Laboratory of University of Guizhou Province (qianjiaoheKYzi[2019]053).

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	Articles by authors
	ZHAO Guoqi
	LIU Lirong
	TIAN Ning
	TIAN Sugui
	FANG Yongfeng
	YAN Huajin
	WANG Guangyan

Cite this article:

ZHAO Guoqi,LIU Lirong,TIAN Ning, et al. Element Distribution and Deformation Characteristics of a Single-crystal Nickel-based Alloy During High-temperature Creep[J]. Materials Reports, 2022, 36(4): 21080216-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21080216 OR http://www.mater-rep.com/EN/Y2022/V36/I4/21080216

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