Effects of samarium addition on as-cast microstructure, grain refinement and mechanical properties of Mg-6Zn-0.4Zr magnesium alloy

Huang, Xiaofeng; Li, Ya; Ma, Zhenduo; Ma, Ying; Yuan, Hao

doi:10.1016/s1002-0721(17)60939-6

Cited by 19 publications

(13 citation statements)

References 18 publications

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“…Adding elemental Sm to cast magnesium alloys has beneficial effects on the solution strengthening, fine-grain strengthening and aging strengthening, but heavier rare-earth elements (Gd to Yb) require an addition of more than 10 % mass fraction to obtain similar effects. 12 Previous studies [13][14][15][16][17] show that the strength of a magnesium alloy was significantly improved at both room and higher temperatures after additions of moderate amounts of elemental Sm. Its strengthening mechanism is related to the solid-solution strengthening, grain-refining strengthening and precipitation strengthening.…”

Section: Introductionmentioning

confidence: 99%

Influence of samarium on the microstructure and mechanical properties of Mg-Y-Zn-Zr alloys

Wang¹,

Qiu²,

Jia³

et al. 2018

Mater. Tehnol.

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The effects of the Sm element on the microstructure of Mg-3Y-2Zn-0.6Zr (w/%) casting alloys were investigated, and the mechanical properties of the alloys were also tested at room temperature and different high temperatures of (423, 473, 523 and 573) K. Due to a heterogeneous nucleation, more refined grains were obtained with an increment of the Sm element. The precipitated phase at the grain boundaries changed from a discontinuous distribution to a continuous mesh. The main phase compositions were a-Mg, W phase-Mg3(Y, Sm)2Zn3 and X phase-Mg12(Y, Sm)Zn. The Y atoms were partly replaced by Sm in the secondary phase. The proportion of the substitutional solid solution increased and Sm-containing phases were not found in the alloy. With the increasing Sm amount, the tensile strength and yield strength increased slightly while the elongation decreased significantly at room temperature. However, the tensile strength at high temperatures decreased at first and then increased. As the temperature increased, the fracture of the MS alloys changed from the main intergranular fracture to a transgranular fracture.

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Section: Introductionmentioning

confidence: 99%

Influence of samarium on the microstructure and mechanical properties of Mg-Y-Zn-Zr alloys

Wang¹,

Qiu²,

Jia³

et al. 2018

Mater. Tehnol.

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Section: Resultsmentioning

confidence: 89%

“…Figure3(f) illustrates that the hardness of the eutectic phases was significantly higher compared to that of the primary phase. This result indicated that the forming of melt would cause the decrease of strength in sintered alloys[16].Figure4presents the OM micrographs of the ZK60 alloys sintered at different temperatures. Figures4(a)-(b) clearly show that the particle boundary (pointed by yellow arrows) of alloys sintered at 450 °C and 500 °C was continuous and thick.…”

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confidence: 89%

Effect of sintering temperature on microstructures and mechanical properties of ZK60 magnesium alloys

Jin

et al. 2022

Mater. Res. Express

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In this study, ZK60 Mg alloys were prepared via hot-press sintering under a constant pressure of 30 MPa as well as Ar atmosphere. The sintering temperature was determined to be in the range of 450–600 °C with an interval of 50 °C. The effect of sintering temperature on the microstructures and mechanical properties of the alloys was investigated. All the four sintered alloys mainly exhibited an α-Mg-phase structure and equiaxed grain microstructure. However, a specific amount of melt, enriched in Zn element, formed when the sintering temperature reached 500 °C. Thus, only the alloy sintered at 450 °C maintained the nominal composition of the alloy powder, and exhibited the favorable yield strength and hardness, which was 135.1 MPa and 57 HV, respectively. The alloys sintered at 550 °C and 600 °C exhibited a reduced yield strength and hardness due to the loss of Zn element.

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“…The above outcome means that the Mg 17 Al 12 compounds play an adverse role in the incrseing of tensile properties of the studied alloys. It is reported that the lamellar eutectic microstructures possibly act as crack initiation sites during tensile test, thus leading to the relatively poor tensile properties 21 . 3When the Al addition exceeds 4%, the local morphology of the eutectic phase is evolved into lamellar shape, which is possibly related to the deterioration of the mechanical properties.…”

Section: Alloy Codementioning

confidence: 99%

Microstructural Evolution and Mechanical Properties of As-Cast Mg-12Zn Alloys with Different Al Additions

Zhang

Yang

et al. 2020

Mat. Res.

Self Cite

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In this study, Mg-12Zn magnesium alloys alloyed with Al additions (0, 2, 4, 6, 8 and 10, wt.%) were fabricated by permanent mould casting. The Al content on their microstructure and mechanical properties were systematically examined with an optical microscope (OM), a scanning electron microscope (SEM), an X-ray diffractometer (XRD) and mechanical tests at room temperature. The experimental results indicate that the microstructure of the alloys is mainly composed of α-Mg and semi-continuous or continuous eutectic phases. A higher addition of Al (≥6%) causes the generation of the Mg 17 Al 12 phases. Notably, the grain sizes of the alloys gradually decrease, whilst the partial morphology of some eutectic phases is modified into lamellar structure with increasing of Al addition. Mechanical properties characterization manifested that, the alloys with different Al additions reveal distinguishing tensile properties. Among them, the alloy with 4% Al provides an excellent mechanical properties, i.e., a UTS of 206 MPa and an EL of 7.92%, which is respectively higher 28 MPa and 1.08% than that of ZA120 alloy. The deterioration in the tensile properties for the higher Al-bearing alloys is possibly related to the lamellar structure, coarse and continuous network morphology and β-Mg 17 Al 12 phases, respectively.

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Effects of samarium addition on as-cast microstructure, grain refinement and mechanical properties of Mg-6Zn-0.4Zr magnesium alloy

Cited by 19 publications

References 18 publications

Influence of samarium on the microstructure and mechanical properties of Mg-Y-Zn-Zr alloys

Influence of samarium on the microstructure and mechanical properties of Mg-Y-Zn-Zr alloys

Effect of sintering temperature on microstructures and mechanical properties of ZK60 magnesium alloys

Microstructural Evolution and Mechanical Properties of As-Cast Mg-12Zn Alloys with Different Al Additions

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