Effects of grain size and strain rate on ambient deformation behavior of hot rolled Mg-Al-Sn sheet with annealed at 250

4

50 ℃ were investigated

and deformation mechanism was analyzed.The results reveal that with increasing in annealing temperature

the grain size in the alloy sheet is coarsened with a relative homogeneous distribution.With increasing in grain size

at a given strain

twin grain is increased.Meanwhile

with strain increase

twin grain in the alloy is increased too.With decreasing in strain rate

yield strength and tensile strength of the alloy are declined

while the elongation is increased.In addition

the volume fraction of twin grain is increased with increasing in strain.At the same strain

the volume fraction of twin grain in the alloy with strain rate of 0.01s-1 is the higher than that of ones with 10-4 s-1.