Effect of Extrusion Route on Grain Refinement during ECAP Process

Chun Yan Ban; Hai Tao Gao; Chuan Qiang  Li; Dong  Han; Jian Zhong  Cui

doi:10.4028/www.scientific.net/AMR.790.90

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Effect of Extrusion Route on Grain Refinement during ECAP Process

Abstract:

The effect of the extrusion route (A, C and B_C) on grain refinement during ECAP process in 99.9995% (5N5) high pure aluminum using a die with a channel-intersection angle 90° was investigated. It was found through experiment that, the grain was very coarse in the cast ingot of 5N5 high pure aluminum, and the average grain size is about 50~60mm. After two ECAP passes, the average grain size is 300μm, 550μm and 200μm respectively with the extrusion route of Route A, C and B_C. After eight ECAP passes, the average grain size is 100μm, 100μm and 30μm respectively with the extrusion route of Route A, C and B_C. It indicates that the route B_C is more effective than Route A and C. TEM micrograph of 5N5 high pure Al with different ECAP pass under Route B_C was studied.