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王晓溪,张 翔,庄 翌,陆佳鑫,井新宇.等通道球形转角挤压过程中工业纯铝的微观组织演变与力学性能[J].稀有金属材料与工程(英文),2020,49(6):1963~1969.[WANG Xiaoxi,ZHANG Xiang,ZHUANG Yi,LU Jiaxin and JING Xinyu.Microstructure Evolution and Mechanical Properties of Commercially Pure Aluminum during the process of Equal Channel Angular Extrusion with Spherical Cavity(ECAE-SC)[J].Rare Metal Materials and Engineering,2020,49(6):1963~1969.]
Microstructure Evolution and Mechanical Properties of Commercially Pure Aluminum during the process of Equal Channel Angular Extrusion with Spherical Cavity(ECAE-SC)
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Received:September 19, 2019  Revised:October 21, 2019
DOI:
Key words: severe plastic deformation(SPD)  equal channel angular extrusion with spherical cavity(ECAE-SC)  strain accumulation  grain refinement  microstructure evolution.
Foundation item:国家自然科学基金资助(51905462);江苏省“六大人才高峰”高层次人才选拔培养资助项目(GDZB-127);江苏省科协青年科技人才“托举工程”资助培养项目(苏科协发〔2018〕202号)
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WANG Xiaoxi,ZHANG Xiang,ZHUANG Yi,LU Jiaxin and JING Xinyu  
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Abstract:
      A new process named equal channel angular extrusion with spherical cavity (ECAE-SC) is proposed based on the idea of breaking through the equal channel during the whole process of traditional ECAP, which combines positive strain with shear strain. On the self-designed ECAE-SC die, the continuous, efficient and compound severe plastic deformation of commercially pure aluminum was realized in a single pass of ECAE-SC at room temperature. Microstructure evolution of commercially pure aluminum during ECAE-SC process was observed and analyzed by optical microscopy (OM), EBSD and TEM. Moreover, microhardness of the processed materials at different deformation regions was tested. The results show that under the severe plastic deformation induced by simple shear, the equiaxed ultrafine grains with average grain size of 400 nm can be obtained by only one pass of ECAE-SC. The deformation mechanism of ECAE-SC at room temperature is dominated by dislocation slip accompanied with incomplete continuous dynamic recrystallization, and the grain refinement process mainly includes the generation of shear bands, the formation of cellular substructures, the appearance of subgrains with low angle boundaries (LABs) and the formation of equiaxed ultrafine grains with large angle boundaries (HABs). After one pass of ECAE-SC, the main texture of commercially pure aluminum is Gauss texture {110} < 001 >, while some {111} < 112 > copper texture exists. The microhardness of the processed materials on the cross section increases significantly, and the average value increases from 28.94 HV to 56.53 HV, with an increase of 95.33%. Meanwhile, a more uniform hardness distribution is obtained.