工业纯钛ECAP变形组织与织构演变的EBSD分析

发布时间：2018-03-07 08:02

本文选题：工业纯钛　切入点：等径弯曲通道变形(ECAP)　出处：《稀有金属》2015年06期 　论文类型：期刊论文

【摘要】：利用电子背散射衍射(EBSD)对采用90°模具以C方式制备的等径弯曲通道变形(ECAP)各道次工业纯钛(CP-Ti)试样的组织及织构演变进行表征。结果表明:1道次变形后,ECAP组织并不均匀,既有拉长的粗晶,又有细小的等轴晶。随着道次的增加,组织变得细小均匀,从而达到细化晶粒的效果;工业纯钛ECAP变形初始阶段,粗大的晶粒破碎,产生位错缠结和位错胞,使小角度晶界增加。随着道次的增加,位错不断地向亚晶界运动,亚晶间产生相对滑动和转动,最终形成具有大角度晶界的超细晶组织,使小角度晶界减少,大角度晶界增加。工业纯钛原始试样具有双峰基面织构,晶体的c轴由法向方向(ND)向挤出方向(ED)偏转约15°,4道次变形后变为剪切织构,晶体的基面与剪切面平行,最终形成织构组分为(1120)[1101]。
[Abstract]:The microstructure and texture evolution of ECAP samples prepared by 90 掳mold with C mode were characterized by electron backscatter diffraction (EBSD). The results show that the microstructure of ECAP is not uniform after 1 pass deformation. As the number of passes increases, the microstructure becomes fine and uniform, thus the effect of grain refinement is achieved. In the initial stage of ECAP deformation, coarse grains break up, resulting in dislocation entanglement and dislocation cell. As the number of passes increases, the dislocation moves continuously toward the sub-grain boundary, resulting in relatively sliding and rotating between sub-crystals, resulting in the formation of ultrafine grain structure with large angle grain boundaries, resulting in the decrease of small angle grain boundaries. Large angle grain boundary is increased. The original samples of pure titanium have bimodal basal texture, the c axis of the crystal is shifted from normal direction to extrusion direction (ND) to the direction of extrusion (ED4). After 4 passes of deformation, the crystal becomes shearing texture, and the base plane of the crystal is parallel to the shear plane. The resulting texture component was divided into 1 1 120) [1101].
【作者单位】：西安建筑科技大学冶金工程学院;
【基金】：国家自然科学基金面上项目(51474170) 陕西省教育厅专项基金项目(14JK1390)资助
【分类号】：TG146.23;TG379

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