High strain rate deformation behavior of Mg-Al-Zn alloys at elevated temperatures

摘要

High temperature deformation behavior of AZ31 and AZ91 magnesium alloys was examined by compression tests over a wide strain rate range from 10~(-3) to 10~3 s~(-1) with emphasis on the behavior at high strain rates. The dominant deformation mechanism in the low strain rate range below 10~(-1) s~(-1) was suggested to be climb-controlled dislocation creep. On the other hand, experimental results indicated that the deformation at a high strain rate of ～10~3 s~(-1) proceeds by conventional plastic flow of dislocation glide and twinning even at elevated temperatures. The solid-solution strengthening was operative for high temperature deformation at ～10~3 s~(-1).