Microstructure and mechanical properties of sand-cast Mg-6Gd-3Y-0.5Zr alloy subject to thermal cycling treatment

Zhou, Beiping; Liu, Wencaı; Wu, Guohua; Zhang, Liang; Zhang, Xiaolong; Ji, Hao; Ding, Wei

doi:10.1016/j.jmst.2020.01.013

Cited by 28 publications

(3 citation statements)

References 29 publications

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“…Figures 2(c) and 2(d) are the TEM images of the eutectic phase. The selected area electron diffraction (SAED) pattern indicates that the Mg 24 (Gd, Y) 5 phase has a bcc structure with a lattice parameter of a=11.2 nm, which is the same as that reported in previous works [18,19] . From Fig.…”

Section: Microstructuresupporting

confidence: 84%

(Y, Gd)H2 phase formation in as-cast Mg-6Gd-3Y-0.5Zr alloy

Wang

Wang³

et al. 2021

China Foundry

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In this work, a new (Y, Gd)H 2 precipitate was identified and systematically investigated in the ascast Mg-6Gd-3Y-0.5Zr alloy by XRD, SEM with EDS, TEM with EDS techniques and thermodynamics analysis. Results show that the as-cast alloy contains α-Mg, Mg 24 (Gd, Y) 5 , and (Y, Gd)H 2 phase. The (Y, Gd)H 2 phase usually forms near the eutectic phase Mg 24 (Gd, Y) 5 or in the α-Mg grains, displaying a rectangle-shape. The Mg 24 (Gd, Y) 5 and (Y, Gd)H 2 phases crystalize in bcc and fcc structure, respectively, and the (Y, Gd)H 2 phase has a semi-coherent relationship with α-Mg matrix. The thermodynamics calculation results reveal that the hydrogen dissolved in the melt leads to the formation of hydrides. It is also found that the (Y, Gd)H 2 hydride can form directly from the liquid phase during solidification. Additionally, it can precipitate by the decomposition of Mg 24 (Gd, Y) 5 phase due to absorbing hydrogen from the remaining melt.

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Section: Microstructuresupporting

confidence: 84%

(Y, Gd)H2 phase formation in as-cast Mg-6Gd-3Y-0.5Zr alloy

Wang

Wang³

et al. 2021

China Foundry

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“…Magnesium alloys have potential applications in aerospace, transportation, and other fields due to their low density, good electromagnetic shielding and machining ability [1,2], which is beneficial for reducing weight, energy saving and emission reduction [3][4][5][6]. The application of magnesium alloys in different situations requires materials to exhibit different properties, such as creep resistance, high temperature mechanical properties and corrosion resistance [7].…”

Section: Introductionmentioning

confidence: 99%

An investigation on the precipitates in T5 treated high vacuum die-casting AE44–2 magnesium alloy

Li¹,

Wang²,

Hai³

et al. 2022

Mater. Res. Express

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The AE44-2 magnesium alloy was fabricated via die-casting under high vacuum (denoted as HVDC-AE44-2 alloy). The microstructures and mechanical properties of the aged HVDC-AE44-2 alloys were investigated. It found that age strengthening can be achieved in the HVDC-AE44-2 alloys. This paper reports, the HVDC-AE44-2 alloys after aging at 200 °C for 12 h (T5), the hardness increased by ~8.8 HV (~14.0%), the yield strength (YS) and the ultimate tensile strength (UTS) increased by ~30.5 MPa (~20.4%) and ~22.6 MPa (~9.1%), respectively, while the increase in strength after aging was not accompanied by a significant loss in ductility (The elongation was 19.6% in the die casting. The elongation was 19.1% in aged at 200°C for 12h). It is found that the improved age hardening ability is closely related to the Al4Mn and Al11Mn4 precipitation during aging. Both the α-Mg and the Al11RE3 have crystallographic orientation relationships with the Al4Mn. The slipping of dislocations was impeded by the precipitates during tensile deformation at room temperature, and the <a> dislocations were accumulated around the precipitates, which is the reason for the increase of the HVDC-AE44-2 alloy strength.

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“…The most common techniques are high-pressure die casting using metal mold (Watarai, 2006;Dadić et al, 2019;Özarslan et al, 2019) and gravity casting using sand mold (Bazhenov et al, 2020;Ren et al, 2011). Because of zirconium presence (applied in order to grain refinement), Mg alloys can be sand casted (Dobrzanski et al, 2009;Zhou et al, 2020). Shell Mold Casting (SMC) is a similar metal casting process by pouring molten metal into an expendable sand-based mold, casting it into a thin-walled shell created by applying a sand-resin mixture around a pattern.…”

Section: Introductionmentioning

confidence: 99%

Análisis térmico y comportamiento de desgaste de aleaciones Mg-4Zn-(x)Zr fundidos en molde de cáscara y molde de grafito

Kumruoğlu

2021

revmetal

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El efecto de refinamiento del grano del circonio (Zr) es conocido, sin embargo, la influencia en la cantidad de Zr y su efecto sobre la solidificación y el comportamiento de desgaste de las aleaciones de Mg-Zn modificadas no se han estudiado adecuadamente. Las aleaciones de Mg-4Zn-(x)Zr son aleadas con la adición de 0,5% a 4% en peso de elemento Zr se funden y se vierten en dos moldes de colada diferentes y se realizan análisis térmicos. Se examinaron la microestructura de los productos de colada, el comportamiento de solidificación, las transformaciones de fase, el tamaño de grano, las curvas de análisis térmico y las propiedades de desgaste. La microestructura se modificó mediante la adición de Zr y el tamaño de grano se redujo tanto para los materiales de moldeo de grafito como de cerámica. La máxima resistencia a la tracción se obtuvo añadiendo 1% de Zr (170 MPa) y 4% Zr (105-110 HRB) utilizando un molde de grafito, respectivamente. La máxima resistencia a la tracción a temperatura ambiente se alcanzó en el Mg-4Zn-1Zr, el alargamiento fue del 4,9% y la resistencia a la tracción fue de 138 MPa. El valor máximo de tracción en caliente se obtuvo en las aleaciones con 2% de Zr añadido. La tasa de desgaste de la aleación Mg-4Zn disminuyó al aumentar el elemento Zr hasta un 2% en peso. La adición de más del 2% en peso de Zr provocó un aumento de la microporosidad en la microestructura. Debido a la microporosidad causada por la adición de Zr, la tasa de desgaste se redujo ligeramente.

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Microstructure and mechanical properties of sand-cast Mg-6Gd-3Y-0.5Zr alloy subject to thermal cycling treatment

Cited by 28 publications

References 29 publications

(Y, Gd)H2 phase formation in as-cast Mg-6Gd-3Y-0.5Zr alloy

(Y, Gd)H2 phase formation in as-cast Mg-6Gd-3Y-0.5Zr alloy

An investigation on the precipitates in T5 treated high vacuum die-casting AE44–2 magnesium alloy

Análisis térmico y comportamiento de desgaste de aleaciones Mg-4Zn-(x)Zr fundidos en molde de cáscara y molde de grafito

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