Microstructure and properties of Mg-Al binary alloys

• Main Authors: ZHENG Wei-chao, LI Shuang-shou, TANG Bin
• Format: Article
• Language: English
• Published: Foundry Journal Agency 2006-11-01
• Series: China Foundry
• Subjects: Mg-Al binary alloys; grain size; α-Mg dendrite; eutectic microstructure; hot cracking
• Online Access: http://www.foundryworld.com/uploadfile/20094161419781.pdf

The effects of different amounts of added Al, ranging from 1 % to 9 %, on the microstructure and properties of Mg-Al binary alloys were investigated. The results showed that when the amount of added Al is less than 5%, the grain size of the Mg-Al binary alloys decreases dramatically from 3 097 μm to 151 μm with increasing addition of Al. Further addition of Al up to 9% makes the grain size decrease slowly to 111 μm. The α-Mg dendrite arms are also refined. Increasing the amount of added Al decreases the hot cracking susceptibility of the Mg-Al binary alloys remarkably, and enhances the micro-hardness of the α-Mg matrix.