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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2021.1
- 수록면
- 1,613 - 1,619 (7page)
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초록· 키워드
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In this study, microstructures, phase compositions, phase morphologies of the as-cast and as-extruded Mg–8Y–2Ho–2Zn(wt%) alloys were investigated by optical microscope, scanning electron microscope, energy-dispersive spectrometer, transmissionelectron microscope and X-ray diffraction. The mechanical properties at room temperature and elevated temperatureswere evaluated by tensile test. The primary secondary phases in the as-cast alloy are 18R-type long period stacking ordered(LPSO) phase. After extrusion, the microstructure mainly consists of considerable fine dynamically recrystallized (DRX)grains, the long strip 18R-type LPSO-phase at grain boundary along the extrusion direction and the fine lamellar 14H-typeLPSO-phase in the interior of DRX grains. When the temperature is increased, the strength of the alloy is reduced, but theelongation progressively rises. The as-extruded alloy shows higher strength and larger elongation than the as-cast alloy ateach test temperature. The superior mechanical properties of the as-extruded alloy are ascribed to various strengtheningmechanisms induced by co-addition of Y and Ho element, e.g., solid solution strengthening, fine-grain strengthening andstrengthening of fine LPSO-phase.
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