Influence of aging modes on microstructure and mechanical properties of AZ80 magnesium alloy

• Published in: China foundry Vol. 4; no. 4; pp. 296 - 299
• Main Authors: Zhang, Ju-Mei, Jiang, Bailing, Wang, Zhi-Hu, Yuan, Sen, Nan, Hong-Qiang, Luo, Hong-Bin
• Format: Journal Article
• Language: English
• Published: Xi'an University of Science & Technology, Xi'an 710054, China%School of Materials Science and Engineering,Xi'an University of Technology, Xi'an 710048,China 01.11.2007; Department of Materials Science and Engineering; School of Materials Science and Engineering,Xi'an University of Technology, Xi'an 710048,China; Foundry Journal Agency
• Subjects: aging treatment; magnesium alloy; mechanical property; microstructure; solid solution; 固溶体; 时效处理; 机械设备; 镁合金; aging treatment; magnesium alloy; mechanical property; microstructure; solid solution
• ISSN: 1672-6421; 2365-9459

The microstructure and mechanical properties of AZ80 magnesium alloy after solid solution and aging treatments were studied by using optical microscope （OM）, X-ray diffraction （XRD）, scanning electron microscopy （SEM） as well as tensile testing. The results indicated that β-Mg17Al12 phase was getting to distribute discontinuously along the grain boundary after treated at 395℃ ageing for 12 h followed by water-cooling, but it did not dissolve into α-Mg completely. The residualβ-Mg17Al12 phase distributed along the grain boundary and had block-like or island shapes. The size of α-Mg was getting to be coarsening but not significantly. The β-Mg17Al12 precipitates appeared in discontinuous and continuous pattems from supersaturated α-Mg solid solution after aged at 200℃. The precipitation patterns were associated with the aging time essentially. The tensile strength and elongation of the alloy increased significantly but the hardness and yield strength decreased after solid solution treatment. However, with the prolonging of aging time, the hardness and strength of alloy increased while the ductility decreased.