Substructure Evolution of Ti-6Al-2Zr-1Mo-1V Alloy Isothermally Hot Compressed in α+β Two-Phase Region
来源期刊：Acta Metallurgica Sinica2013年第5期
论文作者：Chuan WU He YANG Hongwei LI
文章页码：533 - 544
摘 要：Substructure evolution significantly influences the flow behavior of titanium alloys in isothermal hot compression.This paper presents a physical experiment（isothermal hot compression and electron backscatter difraction,EBSD）and a cellular automaton（CA）method to investigate the substructure evolution of a near-αtitanium alloy Ti-6Al-2Zr-1Mo-1V（TA15）isothermally compressed in theα+βtwo-phase region.In the℃A model,the subgrain growth,the transformation of low angle boundaries（LABs）to high angle boundaries（HABs）and the dislocation density evolution were considered.The dislocation density accumulating around the subgrain boundaries provided a driving force and made the transformation of the LABs to HABs.The℃A model was employed to predict the substructure evolution,dislocation density evolution and flow stress.In addition,the efects of strain,strain rate and temperature on the relative frequency of the HABs were analyzed and discussed.To verify the℃A model,the predicted results including the relative frequency of the HABs and the flow stress were compared with the experimental values.
Chuan WU，He YANG，Hongwei LI
State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University
摘 要：Substructure evolution significantly influences the flow behavior of titanium alloys in isothermal hot compression.This paper presents a physical experiment（isothermal hot compression and electron backscatter difraction,EBSD）and a cellular automaton（CA）method to investigate the substructure evolution of a near-αtitanium alloy Ti-6Al-2Zr-1Mo-1V（TA15）isothermally compressed in theα+βtwo-phase region.In the℃A model,the subgrain growth,the transformation of low angle boundaries（LABs）to high angle boundaries（HABs）and the dislocation density evolution were considered.The dislocation density accumulating around the subgrain boundaries provided a driving force and made the transformation of the LABs to HABs.The℃A model was employed to predict the substructure evolution,dislocation density evolution and flow stress.In addition,the efects of strain,strain rate and temperature on the relative frequency of the HABs were analyzed and discussed.To verify the℃A model,the predicted results including the relative frequency of the HABs and the flow stress were compared with the experimental values.
关键词：
