Hasan Shokri Ragheb - Student, Hamedan Branch, Islamic Azad University, Hamedan, Iran
Farzan Barati - AssistantProfessor , Hamedan Branch, Islamic Azad University, Hamedan, Iran
Hamid Reza Rezaei - AssistantProfessor, Hamedan Branch, Islamic Azad University, Hamedan, Iran
Ali asghar Mohammadi - Student, Buali sinaUniversity , Hamadan, Iran

The hot deformation behavior of an AZ81 magnesium alloy was investigated by hot compressive testing on aSantam thermal mechanical simulator in the temperature of both 200 and 250°C and in the strain rate range of 0.00 s-1,0.01 s-1,0.1s-1 . The relationships amonghardness, strain rateand deformation temperature were analyzed. Hardness was decreased up to 59% by increasing temperature from 200c to 250c and also it increased 4% with the increase of strain rate ranging from 0.001 s-1to 0.01 s-1 and 3% for 0.01 s-1to 0.1s-1 in bothtemperatures.Average ratio of hardness at both ends of sample to middle section was 1.3.

AZ81 Magnesium Alloy, Hardness, strain rate, the bulk compression forming, extrusion