Hot workability analysis of extruded Mg-Zn-Mn-Y magnesium alloys with different phases
Workability,an important parameter in magnesium alloys forming process,can be evaluated by means of processing maps on the basis of dynamic materials model,constructed from experimentally generated flow stress variation with respect to strain,strain rate and temperature.To obtain the processing maps of extruded Mg-Zn-Mn-Y magnesium alloy with different secondary phases (Ⅰ-phase and W-phase),hot compression tests were performed over a range of temperatures 523-673 K and strain rates 0.001~10s-1.The response of strain-rate sensitivity (m-value),power dissipation efficiency (t-value) and instability parameter (n-value) to temperature and strain rate were evaluated.By the superimposition of the power dissipation and the instability maps,the dynamic recrystallization (DRX) and instability zones were identified and validated through micrographs.The observations were performed in order to describe the behavior of the material under hot forming operation in terms of material damage and micro-structural modification.
Magnesium alloy Hot deformation Processing map Dynamic recrystallization
Weiwei He Kun Zhang Min Huang Shenglong Dai
Beijing Institute of Aeronautical Materials, Beijing, 100095, China
国际会议
香港
英文
1010-1016
2012-07-27（万方平台首次上网日期，不代表论文的发表时间）