Microstructure and heat resistance of Mg–Al–Zn alloys containing metastable phase

✍ Scribed by Jeong-Min Kim; Bong-Koo Park; Joong-Hwan Jun; Keesam Shin; Ki-Tae Kim; Woon-Jae Jung

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 826 KB
• Volume: 449-451
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2006.02.447

✦ Synopsis

In this research microstructural studies have been made on cast specimens of AZ91 base alloys containing various amounts of Zn. As the amount of Zn addition increased up to 2%, any new Zn-containing phase did not appear while the Zn content in Mg 17 Al 12 phase continuously increased. A quasi-crystalline phase started to form at Mg 17 Al 12 phase when the added Zn content was about 3 wt.%. The tensile strength and elongation of the alloys at 175 • C were observed to increase significantly with increasing Zn content. The quasi-crystalline phase was found to be stable up to 300 • C, based on scanning electron microscopy examinations of the specimens heated at different temperatures for 24 h.