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黄海亮,刘国权,王浩,胡本芙.新型高性能镍基粉末高温合金拉伸变形行为和机制研究[J].稀有金属材料与工程(英文),2019,48(4):1142~1147.[Huang Hailiang,Liu Guoquan,Wang Hao and Hu Benfu.Deformation Behavior and Mechanisms of Tensile in a Advanced High-performance Nickel-Based PM Superalloy[J].Rare Metal Materials and Engineering,2019,48(4):1142~1147.]
Deformation Behavior and Mechanisms of Tensile in a Advanced High-performance Nickel-Based PM Superalloy
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Received:July 19, 2018  Revised:August 17, 2018
Key words: Ni-based PM superalloy  dislocation  stacking faults  deformation twins  deformation behavior
Foundation item:国家重点研发计划资助(项目号2016YFB0700501);国家自然科学基金资助(项目号 51571020)
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Huang Hailiang,Liu Guoquan,Wang Hao and Hu Benfu  
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      The deformation microstructures, deformation behavior and mechanisms of FGH98 after tensile tests at room temperature(23℃) and intermediate temperatures(650℃、750℃、815℃)have been investigated by scanning electron microscopy(SEM)and transmission electron microscopy(TEM). The results show that FGH98 alloy, with multi-mode size distribution γ'phase, obtained excellent tensile properties at room temperature and intermediate temperature. The dislocations sheared γ'phase, forming stacking fault(SF) in the γ'precipitate and a dislocation loop around the γ'precipitate, which is the dominant deformation mechanism during the tensile deformation at room temperature. The dislocation loop hindered the subsequent dislocation movement. However, forming SFs and deformation twins by dislocations shearing γ'phase becomes the dominant deformation mechanisms at intermediate temperatures. With the increasing of deformation temperature, the deformation mechanisms transfer from SFs to deformation twins, and the density of twins increased. The model of a/3<112> partial shearing the γ'precipitate forming faults and twins was given. With the increase of strain, the stacking faults accumulated on the adjacent {111} planes, promoting the formation of continuous twins. The formation of continuous twins can coordinate the deformation between the γ and γ'phase and release the deformation stress, resulting in enhancement of the alloy plasticity.