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Substructure Evolution of Ti-6Al-2Zr-1Mo-1V Alloy Isothermally Hot Compressed in α＋β Two-Phase Region

ISSN号：1006-7191
期刊名称：《金属学报：英文版》
时间：0
分类：TG146.21[金属学及工艺—金属材料;一般工业技术—材料科学与工程;金属学及工艺—金属学] U463.341[机械工程—车辆工程;交通运输工程—载运工具运用工程;交通运输工程—道路与铁道工程]
作者机构：[1]State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
相关基金：This work was financially supported by the National Basic Research Program of China （No. 2010CB731701）, the National Natural Science Foundation of China （Nos. 50935007 and 51175428）, Foundation for Fundamental Research of Northwestern Polytechnical University in China （No. NPU-FFR-JC20100229）, and the 111 Project （No. B08040）.

关键词：等温压缩, 结构演变, 钛合金, 子结构, 压缩热, 两相区, 电子背散射衍射, CA模型, Substructure evolution； Cellular automaton modeling； Dislocation density evolution ；EBSD technique

中文摘要：

基础进化显著地在等温的热压缩影响钛合金的流动行为。这份报纸论述一个物理实验(等温的热压缩和电子反散射衍射， EBSD ) 并且调查基础进化的一个细胞的自动机(CA ) 方法一近 -- 钛合金 Ti-6Al-2Zr-1Mo-1V (TA15 ) 等温地在 + 压缩了二阶段的区域。在 CA 模型， subgrain 生长，到高角度边界(HAB ) 和脱臼密度进化的低角度边界(实验室) 的转变被考虑。在 subgrain 边界附近积累的脱臼密度提供了一个驱动力并且做了实验室的转变到 HAB。CA 模特儿被雇用预言基础进化，脱臼密度进化和流动应力。另外， HAB 的相对频率上的紧张，紧张率和温度的效果被分析并且讨论。为了验证 CA 模型，，包括 HAB 和流动的相对频率的预言的结果强调与试验性的价值相比。

英文摘要：

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-α titanium alloy Ti-6Al-2Zr-1Mo-1V（TA15） isothermally compressed in the α ＋ β two-phase region. In the CA 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 CA 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 CA model, the predicted results including the relative frequency of the HABs and the flow stress were compared with the experimental values.