Effects of Ar Degassing on Thermal Compression Performance of AZ91 Alloy
Author of the article:JIA Zheng;SONG Tingting;FU Li;DU Anna;WANG Tong;MA Yulin
Author's Workplace：College of Mechanical Engineering,Shenyang University,Shenyang 110044,China;Key Laboratory of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang 110819,China
Key Words：Ar degassing hydrogen content thermal compression flow stress constitutive equations
Abstract：The effect of argon degassing on the hydrogen content of AZ91 magnesium alloy was studied,and the thermal compression experiment was carried out under the condition of 250~400℃and the strain rate was 0.01~10.00 s^-1.The results show that after Ar degassing,the hydrogen content in the ingot can be reduced from 14.8 cm^3 per 100g before treatment to 7.3 cm^3 per 100g,and the degassing rate is up to 50.7%.During thermal compression,the rheological stress decreases with the increase of temperature and increases with the increase of strain rate.When the strain rate is large,the rheological stress of degassing ingot is slightly higher than that of undegassing ingot.The constitutive equations of thermal deformation under different conditions are obtained.
