首页|Improvement of mechanical properties of in situ Mg-Si composites via Cu addition and hot working
Improvement of mechanical properties of in situ Mg-Si composites via Cu addition and hot working
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NSTL
Elsevier
? 2022 Elsevier B.V.The synergistic effects of copper addition and hot extrusion process on the modification of microstructure and enhancement of mechanical properties of a common in situ hypereutectic Mg-Si metal-matrix composite were studied. It was revealed that Cu addition at the microalloying level of 0.5 wt% was very effective in modifying the primary and eutectic Mg2Si phases, which led to the enhancement of the as-cast mechanical properties. Further Cu additions (2, 4.5, 8, and 15 wt%) led to the appearance of the α-Mg/Mg2Cu eutectic constituent and distinct α-Mg regions with the disappearance of Mg2Si eutectics in the ingots, which was ascribed to the change in the solidification path. Contrary to the favorable effect of Cu at the micro-addition level, higher additions led to poor tensile properties due to the deleterious effect of eutectics. Fragmentation and dispersion of intermetallics, as well as intense grain refinement by dynamic recrystallization (DRX) were observed for the extruded composites due to the hot deformation effects, which resulted in the enhancement of the ultimate tensile strength, total elongation, and tensile toughness. Accordingly, it was concluded that Cu addition to Mg-Si composites should be limited to small amounts for modification effects, and if it is combined with the elevated-temperature thermomechanical processing, the optimum strength-ductility trade-off can be achieved.
Hot deformationMechanical propertiesMg-based hybrid compositesMicrostructureModificationTensile toughness
Maleki M.、Mirzadeh H.、Emamy M.
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School of Metallurgy and Materials Engineering College of Engineering University of Tehran
NSTL
Elsevier
