Abstract
Multiaxial deformation (MAD) of an Mg-0.3% Ca alloy is performed when temperature decreases within the ranges 425–375 and 400–325°C. A decrease in the temperature at the end of MAD causes a decrease in the grain size from 7–8 to 0.5–2 μm and the spread of a sharp prismatic texture, which determine a high strength (σu = 194 MPa) and plasticity (δ = 39%). After MAD in the range 425–375°C, the Mg-0.3% Ca alloy is subjected to equal-channel angular pressing (ECAP) at temperatures of 275 and 325°C. ECAP causes a decrease in the grain size from 7–8 μm to 2 and 5 μm, respectively. The texture also changes from prismatic to tilted basal texture. This results in an increase in the strength to 170-160 MPa at plasticity δ = 25–30%. It is shown that MAD can be used as both final and preliminary processing before ECAP to form an ultrafine-grained structure in the Mg-0.3% Ca alloy.
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