| Influence of Grain Boundary on Fatigue Behavior of Ni-base Bicrystals |
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| 引用本文： | Jiansong WAN,Zhufeng YUE,Xiaoliang GENG and Zhixian LUDepartment of Engineering Mechanics,Northwestern Polytechnical University,Xi''''an 710072,China [ Manuscript received January 16,2001,in revised form April 27,2001]. Influence of Grain Boundary on Fatigue Behavior of Ni-base Bicrystals[J]. 材料科学技术学报, 2002, 18(1) |
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| 作者姓名： | Jiansong WAN Zhufeng YUE Xiaoliang GENG and Zhixian LUDepartment of Engineering Mechanics Northwestern Polytechnical University Xi''''an 710072 China [ Manuscript received January 16 2001 in revised form April 27 2001] |
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| 摘 要： | The influence of the grain boundary on the fatigue behavior was studied by two three-point-bending (TPB) specimens. One TPB specimen was named Bicrystal 1, whose pre-crack was along the grain boundary and the applied load paralleled to pre-crack direction, while the other TPB specimen was named Bicrystal 2, whose the pre-crack was perpendicular to the grain boundary and the applied load paralleled also to the pre-crack. It was found that the rate of the fatigue crack growth of Bicrystal 1 was about a tenfold higher than that of Bicrystal 2. The fatigue behavior of Bicrystal 2 specimens was dependent on the distance between the crack tip and grain boundary. The crack growth rate was highest when the crack tip was at a critical distance to the grain boundary, while the rate was the lowest when the crack tip reached grain boundary. After the crack was over the grain boundary, the crack growth rate increased. The crystallographic finite element method was applied to analyze the stress and strain structure ahead
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Influence of Grain Boundary on Fatigue Behavior of Ni-base Bicrystals |
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| Jiansong WAN,Zhufeng YUE,Xiaoliang GENG,Zhixian LU. Influence of Grain Boundary on Fatigue Behavior of Ni-base Bicrystals[J]. Journal of Materials Science & Technology, 2002, 18(1) |
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| Authors: | Jiansong WAN Zhufeng YUE Xiaoliang GENG Zhixian LU |
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| Abstract: | The influence of the grain boundary on the fatigue behavior was studied by two three-point-bending (TPB) specimens. One TPB specimen was named Bicrystal 1, whose pre-crack was along the grain boundary and the applied load paralleled to pre-crack direction, while the other TPB specimen was named Bicrystal 2, whose the pre-crack was perpendicular to the grain boundary and the applied load paralleled also to the pre-crack. It was found that the rate of the fatigue crack growth of Bicrystal 1 was about a tenfold higher than that of Bicrystal 2. The fatigue behavior of Bicrystal 2 specimens was dependent on the distance between the crack tip and grain boundary. The crack growth rate was highest when the crack tip was at a critical distance to the grain boundary, while the rate was the lowest when the crack tip reached grain boundary. After the crack was over the grain boundary, the crack growth rate increased. The crystallographic finite element method was applied to analyze the stress and strain structure ahead of the crack, in order to reveal the above characteristics of the fatigue behavior. It is the grain boundary-induced redistribution of stresses near the crack tip that induces the difference of fatigue behavior. |
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| Keywords: | Bicrystals Fatigue behavior Grain boundary Shielding effect |
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