TY - JOUR
T1 - Hot workability, microstructural control and rate-controlling mechanisms in cast-homogenized AZ31 magnesium alloy
AU - Prasad, Yellapregada Venkata Rama Krishna
AU - Rao, Kamineni Pitcheswara
PY - 2009/3
Y1 - 2009/3
N2 - The hot working behavior of homogenized as-cast AZ31 magnesium alloy was investigated to optimize the parameters, control the microstructure, and establish the rate-controlling mechanisms in the primary processing stage of the alloy workability. The efficiency of power dissipation occurring through microstructural changes during deformation was derived by comparing the nonlinear power dissipation occurring instantaneously in the work piece with that of a linear dissipater. Cylindrical alloy specimens with 10mm diameter and 15mm height were machined from the central region of the homogenized billet, with longer axis of the compression specimens positioned in diametral plane of the cast billet. The grain size of alloys increase with temperature, and the increase becomes steep after 400°C. Any fluctuation in the applied process parameters in the bifurcation region can cause abnormal changes in dissipative energy state of the alloy.
AB - The hot working behavior of homogenized as-cast AZ31 magnesium alloy was investigated to optimize the parameters, control the microstructure, and establish the rate-controlling mechanisms in the primary processing stage of the alloy workability. The efficiency of power dissipation occurring through microstructural changes during deformation was derived by comparing the nonlinear power dissipation occurring instantaneously in the work piece with that of a linear dissipater. Cylindrical alloy specimens with 10mm diameter and 15mm height were machined from the central region of the homogenized billet, with longer axis of the compression specimens positioned in diametral plane of the cast billet. The grain size of alloys increase with temperature, and the increase becomes steep after 400°C. Any fluctuation in the applied process parameters in the bifurcation region can cause abnormal changes in dissipative energy state of the alloy.
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U2 - 10.1002/adem.200800204
DO - 10.1002/adem.200800204
M3 - RGC 21 - Publication in refereed journal
SN - 1438-1656
VL - 11
SP - 183
EP - 188
JO - Advanced Engineering Materials
JF - Advanced Engineering Materials
IS - 3
ER -