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Liqun Guan,Yunlai Deng,Yaofeng Luo,An Luo,Xiaobin Guo 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10
In this study, low-cost Si was added to an Mg–8Gd–4Y–1Nd–0.5Zr alloy to regulate the intermetallic phases. The mechanicalproperties of 0, 0.5, and 1.0 wt% Si-added alloys were studied to explore the trade-off between the elastic modulus andstrength. The microstructures were characterized through metallographic microscopy, scanning electron microscopy applyingenergy dispersive spectroscopy, and transmission electron microscopy. The microstructures demonstrated that Y5Si3and GdSi phases formed and consumed the solid soluble Gd and Y elements, thus reducing the amount of precipitation andincreasing the size of the β′ phase. Correlations between the elastic modulus and the intermetallic phase indicated that theY5Si3and GdSi phases formed by the addition of Si were the mainly responsible for the improvement in the elastic modulus. The change in strength through the addition of Si was calculated, and the results revealed that such an addition could increasethe elastic modulus but with a reduction in the alloy strength. The addition of 0.5 wt% Si alloy resulted in a relatively highcomprehensive performance, with an elastic modulus of 46 GPa, a tensile strength of 278 MPa, a yield strength of 226 MPa,and an elongation of 4.9% under a cast-T6 state.
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Manfa Yuan,Jin Zhang,Yunlai Deng,Xiaobin Guo,Liqun Guan 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.5
Noteworthy ductility Mg-8Gd-4Y-1Nd-0.5Si (wt.%) alloy with a strong non-basal texture was developed by 12 passes ofmulti-directional forging (MDF) combine with extrusion. The slip trace analysis indicated that deformation mechanism after3 passes of MDF and extrusion were basal < a > , pyramidal < a > and pyramidal < c + a > slips. The intensity of non-basaltexture increased from 5.37 to 8.03 with the MDF passes increased from 3 to 12, which means grain orientation tends tobe more consistent and makes the basal < a > slips easy to pass through grain boundaries to accommodate ductility. Withmore basal < a > slips crossing the grain boundaries, dislocation interaction in grain interior caused stress accumulation,exceeding the critical shear stress (CRSS) of slips with low schmidt factor (SF), and multiple slips appeared. The activationof slip cross grain boundary and multiple slip improved the elongation from 14.7% to 25.6% of MDFs-extruded Mg-8Gd-4Y-1Nd-0.5Si alloy.
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