Hot compression behavior and processing map of cast Mg-4Al-2Sn-Y-Nd alloy
(1. Institute of Metal Research, Chinese Academy of Science, Shenyang 110016, China;
2. New Materials Research Institute of Shandong Academy of Sciences, Ji’nan 250014, China)
2. New Materials Research Institute of Shandong Academy of Sciences, Ji’nan 250014, China)
Abstract: The plastic flow behavior of a newly developed high ductility magnesium alloy, Mg-4Al-2Sn-Y-Nd, was investigated by hot compression from 200 to 400 °C with a strain rate of 1.5×10-3 to 7.5 s-1. The results reveal that the strain rate sensitivity factor (m) of the alloy is much lower than that of the AZ31 alloy, which implies that the alloy should be more suitable for processing at high strain rate. The constitutive relationship of the alloy deformed at elevated temperature was obtained by plotting the experimental data. The stress exponent of the alloy is 10.33, which reveals that climb-controlled dislocations creep is the dominated deformation mechanism. The processing-map technique was used to determine the practical processing window. The proper deformation temperature and strain rate of the cast alloy were determined as 350-400 °C and 0.01-0.03 s-1, respectively.
Key words: magnesium alloy; uniaxial compression; apparent activation energy; processing map