Microstructural evolution of Mg-7Al-2Sn Mg alloy during multi-directional impact forging

作者：M G Jiang; H Yan; L Gao; R S Chen

来源：Journal of Magnesium and Alloys, 2015, 3(3): 180-187.

DOI：10.1016/j.jma.2015.08.005

• Magnesium alloy
• Forging
• Grain refinement
• Dynamic precipitation

Abstract(#br)Multi-directional impact forging (MDIF) was applied to a Mg-7Al-2Sn (wt.%) Mg alloy to investigate its effect on the microstructural evolution. MDIF process exhibited high grain refinement efficiency. After MDIF 200 passes, the grain size drastically decreased to 20 μm from the initial coarse grains of ~500 μm due to dynamic recrystallization (DRX). Meanwhile, original grain boundaries remained during MDIF and large numbers of fine spherical β-Mg 17 Al 12 particles dynamically precipitated along the original grain boundaries with high Al concentration, acting as effective pinning obstacles for the suppression of DRXed grain growth. Besides, micro-cracks nucleated during MDIF and propagated along the interface between the remained globular or cubic Al-Mn particles and Mg matrix.

• 出版日期2015
• 单位中国科学院大学