The microstructure and quasi-static compression properties at elevated temperatures of the aged vacuum die-casting Mg-4Al-4(La, Ce) alloy

In this study, the hot compression test of the aged vacuum die-casting Mg-4Al-4(La, Ce) alloy was performed on Gleeble-3500 simulator. The mechanical properties of Mg-4Al-4(La, Ce) alloy were studied at different compression temperatures (100 degrees C, 150 degrees C, 200 degrees C, and 250 degrees C). During the compression, the microstructure evolution, texture, and dislocation slip of the Mg-4Al-4(La, Ce) alloy were systematically investigated by the electron backscatter diffraction (EBSD) technology. The results demonstrated that the flow stress decreased and the plasticity boosted with the increase in temperature. Mg-4Al-4(La, Ce) alloy exhibits excellent strength and toughness with elevated temperature. At 200 degrees C, it still has compressive strength of 204.5 MPa and compressive elongation of 59%. By observation of the microstructure, it has typical < 0001 >//CD texture after compression. It was found by in-grain misorientation axis (IGMA) analysis that the pyramidal slip is sufficiently activated, which effectively improves the toughness of the alloy. In addition, the dislocations and dislocations are observed at 200 degrees C. Therefore, the excellent mechanical properties of Mg-4Al-4(L a, Ce) alloy at high temperature are the result of grain refinement strengthening, second-phase reinforce-ment and work hardening.(c) 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Automated summary

In this study, the hot compression test was conducted on Gleeble-3500 simulator to investigate the mechanical properties, microstructure evolution, texture, and dislocation slip of the aged vacuum die-casting Mg-4Al-4(La, Ce) alloy at different compression temperatures. The results showed that the alloy exhibited improved plasticity and decreased flow stress with increasing temperature. The excellent strength and toughness of the alloy at high temperature were attributed to grain refinement strengthening, second-phase reinforcement, and work hardening.