Mechanical responses, texture and microstructural evolution of high purity aluminum deformed by equal channel angular pressing

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外文摘要：Ultrafine-grained (UFG) high purity aluminum exhibits a variety of attractive mechanical properties and special deformation behavior. Equal channel angular pressing (ECAP) process can be used to easily and effectively refine metals. The microstructure and microtexture evolutions and grain boundary characteristics of the high purity aluminum (99.998%) processed by ECAP at room temperature are investigated by means of TEM and EBSD. The results indicate that the shear deformation resistance increases with repeated EACP passes, and equiaxed grains with an average size of 0.9μm in diameter are formed after five passes. Although the orientations distribution of grains tends to evolve toward random orientations, and microtextures (80°, 35°, 0°), (40°, 75°, 45°) and (0°, 85°, 45°) peak in the sample after five passes. The grain boundaries in UFG aluminum are high-angle geometrically necessary boundaries. It is suggested that the continuous dynamic recrystallization is responsible for the formation of ultrafine grains in high purity aluminum. Microstructure evolution in the high purity aluminum during ECAP is proposed.

外文关键词：

equal channel angular processing (ECAP)aluminumgrain refinementmicrostructuremechanical property

作者：

汪冰峰、孙杰英、邹金佃、VINCENTSherman、李娟

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基金：

supported by the Hunan Provincial Natural Science Foundation of Chinasupported by the China Scholarship Councilsupported by the Freedom Explore Program of Central South University, Chinasupported by the Freedom Explore Program of Central South University, Chinasupported by the Freedom Explore Program of Central South University, China

项目编号：

12JJ20282013084300932010122000062013zzts1852012zzts066

出版年：

2015

DOI：

10.1007/s11771-015-2912-0

中南大学学报(英文版)

中南大学

中南大学学报(英文版)

CSCDSCIEI

影响因子：0.47

ISSN：2095-2899

年,卷(期)：2015.(10)

被引量4
参考文献量4