Effect of initial microstructures on microstructures and properties of extruded AZ31 alloy

Abstract

The raw materials for extruded preparing magnesium alloy tubes were electromagnetic stirring (EMS) AZ31 magnesium alloy billets and conventional casting (CC) AZ31 magnesium alloy billets. According to the findings, the mechanical properties of the EMS extrusion tubes were far superior to those of the CC extrusion tubes. The key explanation was that the samples of EMS billet had variable initial grain sizes and twin boundaries, which provide additional nucleation sites for DRX nucleation during the extrusion process. With the increase of extrusion temperature and extrusion ratio, the elongation of the tube is further improved. During the extrusion process, the recrystallization mechanism changed from continuous dynamic recrystallization (CDRX) to discontinuous dynamic recrystallization (DDRX).

Influence of Aluminum Content on the Microstructure, Mechanical Properties, and Hot Deformation Behavior of Mg-Al-Zn Alloys

“…Not only can the Al content affect the DRX mechanism during hot deformation, but also a finer grain size before hot deformation [16,27]. In contrast, other publications show that the initial microstructure does not play a role [28].…”

A Study of {10-12} Twinning Activity Associated with Stress State in Mg-3Al-1Zn Alloy during Compression

“…Magnesium alloys have low density, high specific strength, and excellent properties such as high durability, high absorption, excellent electrical and thermal conductivity, and outstanding electromagnetic shielding and damping properties [1,2]. As the lightest structural metal, magnesium alloys have broad application prospects in aerospace, biomedicine, and electronics [2][3][4]. Twinning plays an important role in the low-temperature deformation of magnesium alloys [5][6][7].…”