Transactions of Materials and Heat Treatment

Title：Influence of extrusion pass on microstructure for ECAP high purity aluminum

Authors： Sun Jieying

Unit： Manufacturing Engineering Technology Center GAC FIAT CHRYSLER Automobiles Co. Ltd.

KeyWords： equal channel angular pressing high purity aluminum grain refinement microtexture extrusion pass

ClassificationCode：TG146.2

year,vol(issue):pagenumber：2023,48(3):163-169

Abstract：

The equal channel angular pressing ( ECAP) process was used，and the five-pass extrusion deformation of high purity aluminum was conducted at room temperature. Then, the microstructure, microtexture and grain boundary characteristics of the high purity aluminum processed by ECAP were investigated by means of TEM and EBSD, and the influences of extrusion pass on the microstructure of high purity aluminum after ECAP processing and the evolution mechanism of material structure after estrusion were studied. The results indicate that the shear deformation resistance of the material continuously increases with the increasing of extrusion passes. After five passes of deformation, the grains of the material are significantly refined, forming equiaxed grains with mulit-boundary straight and low dislocation density, and the grain size is about 0.9 μm. At the same time, after five passes of extrusion, the grain orientation of material gradually becomes random, and the microtextures at (80°, 35°, 0°), (40°, 75°, 45°) and (0°, 85°, 45°) reaches the peak value. The grain boundary of ultra-fine-grained high-purity aluminum is a geometrically necessary grain boundary, and the formation of ultra-fine grains after extrusion is the result of continuous dynamic recrystallization.

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作者简介：孙杰英（1988-），男，硕士，工程师 E-mail：sunjieying01@126.com

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