Flow stress and microstructure for two commercial AZ31 magnesium alloy sheets with different grain sizes of 12μm and 5μm have been investigated in warm tension tests at temperatures from 448K to 523K and at strain rates from 1x10
-3/s to 1x10
-1/s. The formula σ =
Fε
n(ε/ε
0)
m for flow stress was successfully established with
F, n and
m values obtained experimentally.
F was calculated from the equation
F = -3.673T + 2170 (MPa) for both materials. Grain refinement by continuous dynamic recrystallization significantly occurred at a large strain of 0.8∼0.9 and at a temperature of 523K for both materials. The effect of grain size on
F was very small.
n, however, decreased and
m increased with decreasing grain size in the experimental ranges of temperature and strain rate.
抄録全体を表示