1.西北工业大学 材料学院 NPU-SAS联合中心;2.安泰天龙钨钼科技有限公司;3.谢菲尔德大学 材料科学与工程学院,英国 谢菲尔德 S QF
1.NPU-SAS Joint Research Center,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi’an;2.ATTL Advanced Materials Co,Ltd;3.School of Materials Science and Engineering,The University of Sheffield,Sheffield,UK,S QF
In this paper, the tensile creep behavior in vacuum of W-4Re-0.27HfC alloy prepared by powder metallurgy was studied. The creep temperature was 1500~1700℃ and the creep stress was 40~60MPa. SEM, EBSD and TEM observations were used to observe the microstructure, characterize the evolution of grain size and dislocation during the creep process. The results show that the steady creep rate of W-4Re-0.27HfC alloy ranges from1′10-7~5′10-6, which is two orders of magnitude lower than that of pure tungsten (W). The creep resistance of W-4Re-0.27HfC alloy is higher than that of pure W due to the dislocation pinned by HfC particles and the lattice distortion caused by Re replacing W atoms. The creep mechanisms of W-4Re-0.27HfC is mainly dislocation slip, accompanied by grain boundary slip at 1500℃. Dislocation climb becomes the main creep mechanism with increasing temperature. The dislocations were blocked by the HfC particles, which leads to the debonding of the HfC/ matrix interface. Moreover, the desquamation of HfC particles forms pores, which results in the great degradation in the creep properties of the alloy.
王琛瑞,董帝,应雯清,张超,王承阳,李玫,孙尚玥,张程煜. W-4Re-0.27HfC合金的1500~1700℃拉伸蠕变性能及损伤机理[J].稀有金属材料与工程,2023,52(10):3600~3607.[Wang Chenrui, Dong Di, Ying Wenqing, Zhang Chao, Wang Chengyang, Li Mei, Sun Shangyue, Zhang Chengyu. Tensile creep properties and damage mechanisms of W-4Re-0.27HfC alloy at 1500~1700 ℃[J]. Rare Metal Materials and Engineering,2023,52(10):3600~3607.]