大角度ECAP变形模具制备纯钛的变形织构演化模拟  

Simulation of Deformation Texture Evolution of Pure Titanium Prepared by Large Angle ECAP Deformation Die

作　　者：杨西荣[1] 郝凤凤 罗雷[1] 刘晓燕[1] 马炜杰 王立元 YANG Xirong;HAO Fengfeng;LUO Lei;LIU Xiaoyan;MA Weijie;WANG Liyuan(School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学冶金工程学院,西安710055

出　　处：《材料导报》2020年第16期16077-16082,共6页Materials Reports

基　　金：国家自然科学基金(51474170)。

摘　　要：为了研究等径弯曲通道变形(ECAP)对纯钛变形织构的影响,本研究采用135°模具在室温条件下以C方式对纯钛实施2道次ECAP变形,然后利用X射线衍射(XRD)仪检测了原始纯钛以及ECAP变形后纯钛的织构,并与VPSC自洽理论模型计算的ECAP变形织构进行对比分析。结果表明:原始纯钛组织为等轴状,晶界清晰,其{0002}晶面极图的最大极密度为2.6,且主要为P 1织构,易发生柱面滑移,同时压缩孪生系处于易激活状态。而经1道次ECAP变形后的织构转变为P织构,同时出现C 2织构。经过2道次ECAP变形后,P织构消失,只存在C 2织构。VPSC自洽理论模型计算织构与实验织构大致相同,且2道次ECAP变形之后的纯钛试样均易发生基面滑移、拉伸孪生系更易被激活。Pure titanium was processed by two passes of ECAP with 135°die via route C at room temperature.The effect of ECAP on the texture of pure titanium was studied by X-ray diffraction(XRD).The original texture and ECAP deformed texture of pure titanium were measured and compared with those of pure titanium calculated by VPSC self-consistent theoretical model.The results show that the original pure titanium is composed of equiaxed grains and the grain boundary is clear.The maximum polar density of{0002}crystal plane is 2.6.The main texture is P 1 texture,which is prone to cylinder slip and the compression twin system is easy to be activated.The original texture of pure titanium transforms into P texture after 1 pass of ECAP,and the C 2 texture appears at the same time.After 2 passes of ECAP,the P texture disappears,and only the C 2 texture exists.The texture calculated by the VPSC is almost similar with the experimental texture,which is prone to basal slip and tension twins are more likely to be activated.

关 键 词：纯钛 等径弯曲通道变形(ECAP) 粘塑性自洽模型(VPSC) 织构 Schmid因子 

分 类 号：TG146[一般工业技术—材料科学与工程]