The Effect of Thermomechanical Treatment on the Mechanical Behavior of Mg-Al-Zn Alloys

Abstract:

In this study, the effect of thermomechanical treatment (TMT) on the aging and mechanical behavior of Mg-Al-Zn alloys has been investigated. Three Mg-Al alloys AZ31, AZ61, and AZ91 were mold cast into a block under a CO2 and SF6 gas mixture atmosphere. The cast specimens were hot-swaged to a rod after homogenizing treatment at 400°C for 4 hours. The prestrain was applied by cold swaging up to 10% RA after solution treatment. From the aging curves obtained at 150°C, it was identified that the hardness of TMT-processed AZ31 and AZ61 did not increase during aging, while that of AZ91 remarkably increased. The tensile strength and elongation of the TMT-processed AZ31 and AZ61 remarkably increased depending on the amount of applied prestrains, indicating the introduction of dislocations prior to aging significantly improved the mechanical properties.

• Periodical: Materials Science Forum (Volumes 488-489)
• Pages: 559-562
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.488-489.559
• Online since: July 2005
• Authors: Keun Yong Sohn, Ryeo Sun Ha, Min Cheol Kang, Kyung Hyun Kim
• Keywords: Aging Curve, AZ31 Alloy, AZ61, AZ91 Alloy, Magnesium, Prestrain, Thermomechanical Treatment (TMT)

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