Effects of heat treatment on microstructure and mechanical properties of extruded AZ80 magnesium alloy

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• 作者：Degang Zhao ; Zhenqing Wang ; Min Zuo ; Haoran Geng
• 刊名：Materials and Design
• 出版年：April, 2014
• 年：2014
• 卷：56
• 期：Complete
• 页码：589-593
• 全文大小：2600 K

文摘

Microstructure evolution of the extruded AZ80 magnesium alloy and different precipitation behavior of 尾-Mg₁₇Al₁₂ phase in different heat treatment conditions were investigated. Solution treatment caused the dissolution of 尾-Mg₁₇Al₁₂ phase and the grain coarsening. During aging, discontinuous precipitates were preferentially initiated at some of the grain boundaries and then continuous precipitates appeared in the grain interiors. In the period of direct-aging, discontinuous precipitates formed between the banded structure and no continuous precipitate appeared. After solution and aging treatment, an improved combination of strength and elongation was obtained. The highest strength was achieved for the extruded AZ80 sample after directing-aging treatment.