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Laidong Yang,Quanan Li,Xiaoya Chen,Wanwan Mei,Nana Zhang 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.11
The influence of Ce microalloying (0.6 wt%) on the microstructure and strengthening mechanism of the extruded Mg–10Gd–0.5Zr alloy were comprehensively researched and analyzed. The experimental results revealed that the addition of 0.6 wt% Ceexcellently reduced the grain size of the as-cast alloy and increased the amount of Mg5Gdeutectic phase. The Ce microalloyingpromoted the dynamic recrystallization level of the extruded alloy, reduced the number and grain size of deformed grains,increased the number of dynamically recrystallized grains, and transformed the basal plane < 10 1 0 > fiber texture graduallyinto < 0001 > texture. Ce microalloying promoted the dynamic precipitation of a small amount of β-Mg5Gd and α-Mg12Ceparticles. After peak aging, the Ce microalloying improved the aging response, increased the aging hardness of the alloy,promoted the aging precipitation of phase, and enhanced the quantity and aspect ratio of phase. The incremental tensileyield and ultimate tensile strength of the extruded alloy resulting from Ce microalloying are 14 MPa and 11 MPa separately,and those of the peak-aged alloy are 53 MPa and 34 MPa respectively. The increase in yield strength of the extruded andpeak-aged alloy is ascribed to the enhanced grain boundary strengthening and the promotion of the phase precipitationstrengthening by Ce microalloying, respectively.
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