Nickel-based single crystal superalloys for aircraft turbine engine blades are generally subjected to anisotropic stresses during service processes,which result in material failures.Here,nickel-based single crystal superalloys with[(1)40],[(3)40]and[(1)(2)2]orientations were in-situ stretched at 650 ℃ by self-developed in-situ stretching equipment.The[(1)40]-oriented sample showed a small magnitude of stress drop after yielding stage when the sample was hardened to the late stage of plastic deformation.The sample was cracked in the matrix where the slip traces were located under the stress.The crack was extended in the direction of the slip traces until the samples were fractured.Continuous stress drop was observed in the[(3)40]oriented sample during the whole plastic deformation.Defects were formed at holes,which led to the material failure.The[(1)(2)2]oriented sample was kept in the hardening stage.Stress drop was observed at the late plastic deformation stage.The sample showed the same manner as the[(3)40]oriented sample.This work provides key insights into the improvement of the service life of alloys under working conditions.
关键词
镍基单晶高温合金/原位拉伸/滑移分析/力学性能
Key words
nickel-based single crystal superalloys/in-situ tensile/slip analysis/mechanical properties
维普
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