Element Distribution and Deformation Characteristics of a Single-crystal Nickel-based Alloy During High-temperature Creep
ZHAO Guoqi1,2, LIU Lirong1,*, TIAN Ning2, TIAN Sugui1, FANG Yongfeng2, YAN Huajin2, WANG Guangyan1,2
1 School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China 2 School of Mechanical Engineering, Guizhou University of Engineering Science, Bijie 551700, Guizhou, China
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.
赵国旗, 刘丽荣, 田宁, 田素贵, 方永锋, 闫化锦, 王光艳. 一种镍基单晶合金高温蠕变期间的变形特征及元素分布[J]. 材料导报, 2022, 36(4): 21080216-7.
ZHAO Guoqi, LIU Lirong, TIAN Ning, TIAN Sugui, FANG Yongfeng, YAN Huajin, WANG Guangyan. Element Distribution and Deformation Characteristics of a Single-crystal Nickel-based Alloy During High-temperature Creep. Materials Reports, 2022, 36(4): 21080216-7.
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2022, Vol. 36 
