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The high temperature deformation behavior of a modi ed AZ61 magnesium alloy was investigated by means of an isothermal compression test on a Gleeble-2000D elevated temperature simulation tester at strain rates of 0.1 s−1 and 1 s−1 and deformation temperatures of 523 K, 623 K and 723 K. The microstructure evolutions and second phases of the experimental alloys were analyzed. Compared to the conventional alloy, the modi ed specimen shows a higher degree of dynamic softening and a lower deformation resistance. The improved deformability becomes more apparent when temperature decreases or strain rate increases, and it is attributed to a great reduction in Mg17Al12 phase and to the formation of Al4RE and Al10RE2Mn7 phases caused by the simultaneous addition of Mn and mischmetal. [doi:10.2320/matertrans.M2016445]

Effect of Simultaneous Addition of Mn and Mischmetal on the High Temperature Deformation Behavior of AZ61 Magnesium Alloy