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- W4377990798 abstract "Mg–Gd–Y–Zn–Zr alloy were fabricated using the cold metal transfer (CMT) arc additive technology. The deformation mechanism and fracture characteristics of the Mg–Gd–Y–Zn–Zr alloy under uniaxial compression were studied by numerical simulation and experiment. The results revealed that the unique delamination and solidification characteristics of CMT and the Marangoni effect of the molten pool promoted the continuous distribution of β-Mg24(Gd, Y)5, at the grain boundary of the α-Mg matrix. Compared with the longitudinal section, the cross section had a uniform grain size distribution, and more dense and regular dimples were formed after the fracture. The Vickers hardness of the cross section was higher than that of the longitudinal section before and after compression. The compressive strength of the cross section was 426.12 MPa, and the fracture elongation was 20.25%, which was 10.14% higher than that of the longitudinal section. This was attributed to the equiaxed and eutectic structure with the uniform cross-section distribution. β-Mg24 (Gd, Y)5 played a better role in fine grain strengthening and precipitation strengthening than the irregularly distributed longitudinal section. The prediction of the fracture tendency of the Mg–Gd–Y–Zn–Zr alloy by using the finite element method was in agreement with the experimental results of uniaxial compression. The concentration of stress and strain at the shear site was the direct cause of fracture. Further, the obvious ‘cleavage step'and ‘tongue-like patterns'existed in the fracture morphology, which proved that the Mg–Gd–Y–Zn–Zr alloy formed by CMT had certain brittleness, and the fracture type was transgranular fracture." @default.
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- W4377990798 date "2023-06-01" @default.
- W4377990798 modified "2023-10-18" @default.
- W4377990798 title "Uniaxial compression deformation and fracture mechanism of cold metal transfer (CMT) arc additive Mg–Gd–Y–Zn–Zr alloy" @default.
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- W4377990798 doi "https://doi.org/10.1016/j.msea.2023.145201" @default.
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