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张杏,王强,张宁,毛卫民,杨平.纯钛晶粒间反应应力对低轧制变形量取向变化的影响[J].稀有金属材料与工程(英文),2019,48(12):3895~3900.[Zhang Xing,Wang Qiang,Zhang Ning,Mao Wei-min and Yang Ping.Effect of intergranular reaction stress on orientation evolution of pure titanium grains after low rolling deformation[J].Rare Metal Materials and Engineering,2019,48(12):3895~3900.]
Effect of intergranular reaction stress on orientation evolution of pure titanium grains after low rolling deformation
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Received:August 09, 2018  Revised:October 08, 2018
Key words: polycrystalline pure titanium  cold-rolling  dislocation slip  reaction stress  plastic deformation model
Foundation item:国家自然科学基金资助(项目号51571024)
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Zhang Xing,Wang Qiang,Zhang Ning,Mao Wei-min and Yang Ping  
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      The grain orientation and grain shape changes of commercial pure titanium after low rolling deformation were observed using scanning electron microscope and backscattering electron diffraction techniques, and the actual active slip systems during deformation process were analyzed statistically. The mechanical interaction between grains and its influence on the slip systems selection and orientation evolution of grains were studied. The active slip systems and orientations’ evolution of rolling grains were simulated using Sachs model and Reaction Stress model. The results show that the plastic strain of grains in the polycrystalline commercial pure titanium is not in accordance with Taylor deformation principle, and the Sachs model can partly reveal the mechanism of slip and trend of the orientation evolution. The plastic deformation of grains depend not only on the external stress, but also on the reaction stress between grains, which influence the selection of slip systems. The Reaction Stress model based on the grains’ interaction can be used to reveal the activation process of the slip systems more comprehensively, and to predict the grain orientation after deformation more accurately. The reaction stress between grains is influenced by many factors, among which, the orientation of grains and its relation to the grain orientation have important impact on the magnitude of the reaction stress.