Response Mechanism of Mechanical Behavior with Mg Plate Microstructure Evolution During Al/Mg/Al Composite Plate Rolled by hard Plate

Abstract

The long manufacturing process, difficult coordinated regulation of structural properties and interface bonding ability are some of the difficulties that restrict the rapid development of lightweight composite plate forming and manufacturing for a long time. In order to solve the above problems, this paper proposes adding hard plate to roll Al/Mg/Al composite plates. The thickness of Mg/Al is 10:1, and the hard-plate rolling process experiments were carried out by designing five groups of different temperatures. The influence of magnesium plate microstructure evolution on the interface bonding ability and mechanical behavior of composite plates is mainly studied. Under the same conditions, the matrix microstructure changes greatly from 200 to 350 °C. At 350 °C, the microstructure of Mg plate in ND is uniform without shear bands and twins. Its recrystallization ratio is 31.77%, which played a role in weakening the texture and reducing its anisotropy. Interestingly, in the process of three-point bending, the non-basal plane slip and the basal plane slip start simultaneously, the maximum bending strength of the composite plate reaches 504 MPa, and the interface was well bonded without obvious bending fatigue phenomenon. The tear test showed that the tear load reaches 0.42 kN, and the elastic elongation stage of Al is longer than the tear propagation stage, and the interface bonding was uniform. The hard plate rolling process provides scientific guidance for the forming and preparation of composite plates.

Graphic Abstract