Abstract
The effect of Ca and Zn additions on the microstructure and texture evolution during thermomechanical processing of Mg-Zn-Ca sheet alloys was systematically investigated and quantified. Plane strain compression testing in a Gleeble thermomechanical simulator was used to physically simulate a 10-pass rolling schedule, while allowing for careful control and monitoring of the processing parameters. Textures in the as-deformed ternary alloy samples demonstrate a weak maximum basal intensity and spreading in the transverse direction. Increasing the Zn content to 3.2 wt.% in the ternary alloys resulted in samples that exhibited weak textures in the as-deformed state. Importantly, static recrystallization (SRX) during post-deformation annealing of these alloys promoted a desirable annular texture, with the c-axis tipped from the normal direction and a lower basal texture intensity. The evolution in texture during SRX is associated with as-deformed microstructures with broad grain orientation spreads and a low degree of recrystallization.
Highlights
The pursuit for magnesium alloy sheet with good low-temperature formability is important to expand Mg utilization for formed products
Weak basal textures were produced in all three of the ternary alloys. This is consistent with existing literature that demonstrates that alloying with Zn + (RE, Ca) can prevent the development of strong basal and RD-split basal textures typically seen in AZ31.6,10,11,15,29 The addition of Ca alone did not change the texture evolution from that observed in unalloyed Mg in this study, Lee et al.[30] did observe basal texture reduction during SRX in the same binary alloys
This study systematically investigated the effect of alloying on texture and microstructure evolution using a known, fixed thermo-mechanical processing (TMP) schedule
Summary
The pursuit for magnesium alloy sheet with good low-temperature formability is important to expand Mg utilization for formed products. Mg alloys which include rare earth (RE) elements have demonstrated improved formability, which is generally attributed to the ‘‘rare earth’’ texture, which is marked by a spreading and weakening of the basal poles along the transverse direction in the sheet.[1,2,3,4,5] the cost of RE elements has encouraged the development of alternative solutions. Weak and spread basal textures and promising sheet formability results have been observed in some nonRE-containing alloys, including many in the Mg– Zn–Ca alloy system.[4,6,7,8,9,10,11,12] The mechanism (or more likely mechanisms) responsible for texture weakening in the Mg-Zn-(RE, Ca) systems remain unknown, but retarding both dynamic recovery and basal texture producing recrystallization mechanisms seem to be important.[1,13,14,15]
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