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题名: Temperature dependence of tensile behavior and deformation microstructure of a Re-containing Ni-base single crystal superalloy
作者: Wang, G. L.;  Liu, J. L.;  Liu, J. D.;  Wang, X. G.;  Zhou, Y. Z.;  Sun, X. D.;  Zhang, H. F.;  Jin, T.
发表日期: 2017-9-15
摘要: Tensile behavior of a Re-containing Ni-base single crystal superalloy with [001] orientation was conducted at from room temperature to 1100 degrees C, and the corresponding deformation microstructure after fracture has been investigated by TEM. This alloy exhibits temperature dependent deformation microstructure and resultant tensile behavior. Shearing of gamma' precipitates by dislocations, with respect to anti-phase boundary (APB) shearing and superlattice stacking fault (SSF) shearing, is mainly controlled by the interplay between gamma/gamma' lattice misfit, intrinsic strength of gamma' phase and stress field of dislocations accumulated on gamma/gamma' interfaces. Below 800 degrees C, the variation with temperature of (0.2%) yield strength is closely linked with the way of dislocations entering.' precipitates, which is largely influenced by temperature dependent gamma/gamma' microstructure modifications. The tensile strength at 1100 degrees C is determined by gliding-climbing of dislocations, with the help of thermal activation, in obviously modified gamma/gamma' microstructure. In fact, flow stresses at 800 degrees C and 1100 degrees C drop remarkably with the onset of numerous APB shearing of gamma' particles after gamma/gamma' misfit stresses are relaxed by depositing dislocations. Last, thermally-activated and plasticity-induced gamma/gamma' microstructure modifications are taken into account to elucidate the deformation microstructure and resulting tensile behavior of this Re-bearing alloy at various temperatures.
刊名: MATERIALS & DESIGN
Appears in Collections:中国科学院金属研究所_期刊论文

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Recommended Citation:
Wang, G. L.,Liu, J. L.,Liu, J. D.,et al. Temperature Dependence Of Tensile Behavior And Deformation Microstructure Of A Re-containing Ni-base Single Crystal Superalloy[J]. Materials & Design,2017,130:131-139.

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