Interfacial structure evolution and mechanical properties of Mg/Al composite sheet by corrugated/flat-flat rolling

doi:10.13251/j.issn.0254-6051.2025.02.022

Abstract

Abstract: Mg/Al composite sheet was prepared by corrugated/flat-flat rolling, and the composite sheet was subjected to final annealing treatment at 200 ℃ for 1 h. The microstructure evolution and mechanical behavior of the interface of the Mg/Al composite sheet were investigated by means of metallographic microscope, scanning electron microscope (SEM/EDS), electron backscatter diffractometer and universal electronic tensile machine. The results show that the metallurgical bonding is realized at the interface after the first pass of the both rolling methods and intermediate annealing at 400 ℃ for 15 min, and no intermetallic compound is formed at the interface. After the second pass of corrugated-flat rolling and 200 ℃×1 h annealing, the grain size of magnesium alloy matrix shows uneven distribution at the trough and peak, and the grains at the trough are significantly refined, but the grain size is larger than that of the flat-flat rolling, The “staggered occlusion” intermetallic compound particles are formed at the interface, and the compounds are dispersed along the corrugated interface, possessing better interface bonding characteristics. While a straight and continuous intermetallic compound layer is formed at flat-flat rolling interface. The corrugated-flat rolling process has the deformation characteristics of local strong pressure and strong shear. Compared to the flat-flat rolling, Mg/Al composite sheet has higher tensile strength and yield strength, and lower plasticity.

Key words: Mg/Al composite sheet, corrugated-flat rolling, flat-flat rolling, interface microstructure, intermetallic compounds, mechanical properties

CLC Number:

TG335.1

Zhu Jinsen, Bian Liping, Luo Baoquan, Li Teng, Wang Tao, Liang Wei. Interfacial structure evolution and mechanical properties of Mg/Al composite sheet by corrugated/flat-flat rolling[J]. Heat Treatment of Metals, 2025, 50(2): 142-147.

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