Grain refinement and texture evolution of a magnesium alloy AZ21 were investigated during multi–directional forging under decreasing temperature from 673 K to 433 K. Dynamic recrystallization (DRX) and texture development were studied at 673 K by OM and SEM/EBSD techniques. The flow curves show rapid hardening accompanied by a stress peak at relatively low strains, followed by strain softening and then a steady state flow stress at high strains. Kink bands with low to medium angle misorientations are evolved at corrugated grain boundaries and also frequently in grain interiors at low strains. Some of them intersect with each other, leading to the fragmentation of original grains. The alignment of the basal planes initially parallel to the compression axis rotated gradually by compression at 673 K and approached an orientation perpendicular to the compression axis at ε=1.2. The relative intensity of texture decreases rapidly with increasing strain to ε=0.4 and goes up later. A similar trend of texture evolution is recognized for the second pass, implying slightly effect of temperature but rather of strain. It is also concluded that increasing the deformation passes can lead to a decrease in texture intensity.
YANG Xu-Ti
,
XUN Huan
,
WU Xin-Xing
,
MA Ji-Jun
,
QIN Jia
,
SUO Qiang-Huan
. EVOLUTIONS OF MICROSTRUCTURE AND MICROTEXTURE IN AZ21 Mg ALLOY DURING MULTI–DIRECTIONAL FORGING UNDER DECREASING TEMPERATURE CONDITIONS[J]. Acta Metall Sin, 2012
, 48(2)
: 129
-134
.
DOI: 10.3724/SP.J.1037.2011.00755
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