Effect of Zr modification on solidification behavior and mechanical properties of Mg–Y–RE (WE54) alloy

Li, Jilin; Chen, Rongshi; Ma, Yuequn; Ke, Wei

doi:10.1016/j.jma.2013.12.001

Cited by 56 publications

(14 citation statements)

References 14 publications

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“…The zirconium-assisted grain refinement in magnesium alloys would originate from both dissolved and undissolved present zirconium in the melt. [34] The incidence of undissolved zirconium particles in the melt (as Zr particles) can act as nucleation sites during solidification. [35] In addition, the solute zirconium would render growth restriction effect and/or concentration gradient effect on nucleation and growth process during alloy solidification.…”

Section: The Role Of Zr Phasementioning

confidence: 99%

The Microstructure Evolution of a High Zr‐Containing WE Magnesium Alloy Through Isothermal Semi‐Solid Treatment

et al. 2015

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In the present study, a Mg-Y-RE-Zr alloy was isothermally heat treated in semi-solid mushy region. The experimental alloy was deliberately composed of a higher amount of Zr (1.9 wt%) to take advantages of grain refinement capabilities of zirconium in both dissolved and undissolved condition. Accordingly, the experimental material possessed a fine equiaxed non-dendritic as-cast structure. The effects of holding time and temperature in the semi-solid region were evaluated on the microstructural evolution through applying a predetermined isothermal heat treatment scheme. The results indicate that increasing the isothermal temperature and holding time would increase the liquid fraction, shape factor, and particle size. It is discussed that the particle spheroidization as well as Ostwald ripening mechanism are triggered at higher temperature. The incremental trends of particle size and shape factor are mitigated after mid-term holding time at 600 and 610°C. This observation is attributed to isolating more discrete particles. A lower coarsening rate of solid particles in the present work is related to the dragging effects of redistributed Zr particles in hindering the boundary motion. Furthermore, the results suggest that the microstructure with optimum characteristics would be achieved by holding the material for 30 min at 620°C. 14395, Iran

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Section: The Role Of Zr Phasementioning

confidence: 99%

The Microstructure Evolution of a High Zr‐Containing WE Magnesium Alloy Through Isothermal Semi‐Solid Treatment

et al. 2015

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“…Thus, a series of high-temperature-resistant magnesium were developed, such as WE54 and WE43. 9,10 The formation of high-temperature stable pha-ses and layers of long-period stacking-ordered (LPSO) structures can greatly enhance the creep resistance when both Y and Zn are added to magnesium alloys. 11 The maximum solid solubility of elemental Sm in a magnesium solid solution occurs at 5.8 % mass fraction (0.99 % atom fraction).…”

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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“…Magnesium (Mg) alloys have great potential as structural metallic materials in automotive and aerospace industries for their low density, high specific strength and superior damping capacity [1,2]. However, relatively low strength and poor formability restrict their wider applications [3,4].…”

Section: Introductionmentioning

confidence: 99%

Effect of Y addition on the microstructures and mechanical properties of as-aged Mg-6Zn-1Mn-4Sn (wt%) alloy

Xing

Huang

et al. 2016

Journal of Alloys and Compounds

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Effect of Zr modification on solidification behavior and mechanical properties of Mg–Y–RE (WE54) alloy

Cited by 56 publications

References 14 publications

The Microstructure Evolution of a High Zr‐Containing WE Magnesium Alloy Through Isothermal Semi‐Solid Treatment

The Microstructure Evolution of a High Zr‐Containing WE Magnesium Alloy Through Isothermal Semi‐Solid Treatment

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

Effect of Y addition on the microstructures and mechanical properties of as-aged Mg-6Zn-1Mn-4Sn (wt%) alloy

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