The Effect of Thermomechanical Treatment on the Mechanical Behavior of Mg-Al-Zn Alloys
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.
W.Ke, E.H.Han, Y.F.Han, K.Kainer and A.A.Luo
K. Y. Sohn et al., "The Effect of Thermomechanical Treatment on the Mechanical Behavior of Mg-Al-Zn Alloys", Materials Science Forum, Vols. 488-489, pp. 559-562, 2005