Interface microstructure and properties of 7075/6061 bimetallic ingot prepared by squeeze composite casting

doi:10.13251/j.issn.0254-6051.2021.06.036

Abstract

Abstract: A 7075/6061 clad bimetal composite ingot with “semi-solid structure/dendrite” distribution characteristics was prepared by squeeze composite casting technology, and the microstructure and hardness at the interface of the composite ingot were analyzed. The results show that the interface bonding is good as metallurgical bonding with no impurity and oxide scale. The transition of microstructure at the interface is smooth, and the solid particles of 7075 aluminum alloy distribute regularly; the distribution of alloy elements except for Zn is uniform. Most of the interface microstructure is composed of fine equiaxed grains, with a large quantity of alloy elements depositing at the grain boundary, resulting in the hardness of the interface higher than that on both sides, with the highest hardness of 63.3 HRB.

Key words: composite casting, 7075 aluminum alloy, 6061 aluminum alloy, microstructure, element distribution, hardness

CLC Number:

TB331
TG146

Zheng Xiaoping, Xie Wenjie, Cao Tong, Xiao Guangyao, Tian Yaqiang, Chen Liansheng. Interface microstructure and properties of 7075/6061 bimetallic ingot prepared by squeeze composite casting[J]. Heat Treatment of Metals, 2021, 46(6): 186-190.

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