To improve metallurgical bonding and texture regulations and grain refinements of Al/Mg bimetallic composite rods, Al/Mg bimetallic composite rods have been prepared by direct extrusion (DE) and extrusion?shear (ES) processes. The bonding layers of the composite rods prepared by DE and ES processes with different preheating temperatures were investigated. Research results demonstrated that good metallurgical bonding layers with no voids and cracks were formed by the ES process with 390?C,there were relatively poor bonding layers during the DE process and ES process with 330?C and 360?C. The microstructures and textures and dynamic recrystallization evolution of Al/Mg bimetallic composite rods fabricated by the ES process were analyzed. Simultaneously, the microhardness and the shearing strength of bonding layers in the Al/Mg composite rods were investigated. The research results show that the grains were refined significantly due to dynamic recrystallization during the ES process. The texture intensities of basal planes and non?basal textures , weakened as the preheating temperatures increases during the ES process. The dynamic recrystallization volume fraction was enhanced. The texture strength of the Al alloy weakened during the ES process, the texture characteristics of the Al alloy changed obviously after the ES process. The ES process can improve metallurgical bonds in Al/Mg composite rods by applying shear forces and has great potential in improving the comprehensive properties of bimetallic materials.This article is protected by copyright. All rights reserved.

» Author: Ye Tian, Hong-jun Hu, Yang Li, Jian-xing Zhao, Xing Hong, Bin Jiang, Ding-fei Zhang

» Publication Date: 05/04/2022

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