The significant effect of trace yttrium level on the mechanical properties of cast Mg–6Al alloy through a refinement mechanism

Korgiopoulos, K.; Pekguleryuz, Mihriban

doi:10.1016/j.msea.2020.138966

Cited by 15 publications

(4 citation statements)

References 34 publications

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“…There is close association (Figs 1 and 2) of the Al 2 Y precipitates with the Mg 17 Al 12 . Similar association has been observed before by the authors (Korgiopoulos & Pekguleryuz, 2020) in Mg-6%Al based alloys for lower Y additions. XRD detects (Fig.…”

Section: Resultssupporting

confidence: 91%

“…The improvement in ductility and UTS is not as significant as lower (trace level) Y additions. Al 2 Y precipitates (determined via XRD and SEM/EDS) are in close association with the Mg 17 Al 12 phase indicating their role as nucleants but the early formation of the Al 2 Y in the liquid in Mg-Al-0.3Y leads to its coarsening, resulting in some loss in mechanical properties compared to the alloy with the trace level of Y. Mg-6Al with trace Y 271 AE 3 9 7 AE 5 2 8 AE 2 (Korgiopoulos & Pekguleryuz, 2020) Mg-6Al-0.3Y 258AE6 6 9 AE6 2 8 AE2 Current work Comments to the Author: This is a useful and detailed work. The only comment which seems unjustified scientifically is the following: "These changes in mechanical properties are not due the well127 known effect of Y on SFE and LPSO since Y has negligible solubility in the a-Mg according to the thermodynamic calculations and EDS results" I strongly advise that this comment should be changed.…”

Section: Discussionmentioning

confidence: 94%

“…Researchers have observed that the modification of β-Mg 17 Al 12 in Mg-Al-Y alloys is responsible for improved mechanical properties (Boby et al, 2013;Cai et al, 2018;Kashefi & Mahmudi, 2012;S.-R. Wang et al, 2009). Previous work (Korgiopoulos & Pekguleryuz, 2020) by the authors has shown that the refinement of β-Mg 17 Al 12 improves the ductility of Mg-6Al cast alloys at trace Y additions. This has been attributed to co-precipitation (at close temperatures) of the Al 4 MgY phase with the Mg 17 A 12 phase.…”

Section: Introductionmentioning

confidence: 99%

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The effect of Y on the microstructure and mechanical performance of an Mg-Al-Y casting alloy

2021

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Environmental gains of electric cars can be optimized with the use of lightweight and recyclable magnesium in the vehicle’s structural components. Ductility improvement of low-density Mg-Al alloys will extend their use in automotive body applications. The authors achieved 63% ductility improvement in Mg-6wt%Al with trace Y (1.5 ppm) due to the β-phase refinement and predicted that higher levels would not perform as well. As predicted, 0.3wt% of Y addition investigated in this study led to lower mechanical performance and β-phase refinement than those obtained with trace additions. The tensile ductility and yield strength increased by ~13% and 16%, respectively, and the compression strain to fracture by ~22%. Scanning electron and optical microscopy, X-Rays diffraction, mechanical testing and thermodynamic calculations were used to investigate the effect of 0.3wt% Y on the microstructure of Mg-6wt%Al. The matrix dissolution revealed the close association of the Al2Y and the β-Mg17Al12 phases.

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Section: Resultssupporting

confidence: 91%

Section: Discussionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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The effect of Y on the microstructure and mechanical performance of an Mg-Al-Y casting alloy

2021

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“…From the results of Figure 1a, there was no apparent diffracted peak, indicating an amorphous structure of the as-deposited film. Moreover, after the annealing treatments, an amorphous state was found, because Y was added to the CoFe alloy and could refine the grain size as shown in Figure 1b-d [21][22][23]. Another possible reason is the lack of a sufficient thermal driving force to support grain growth [24][25][26].…”

Section: Structurementioning

confidence: 99%

Effect of Yttrium Addition on Structure and Magnetic Properties of Co60Fe20Y20 Thin Films

et al. 2021

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In this paper, a Co60Fe20Y20 film was sputtered onto Si (100) substrates with thicknesses ranging from 10 to 50 nm under four conditions to investigate the structure, magnetic properties, and surface energy. Under four conditions, the crystal structure of the CoFeY films was found to be amorphous by an X-ray diffraction analyzer (XRD), suggesting that yttrium (Y) added into CoFe films and can be refined in grain size and insufficient annealing temperatures do not induce enough thermal driving force to support grain growth. The saturation magnetization (MS) and low-frequency alternate-current magnetic susceptibility (χac) increased with the increase of the thicknesses and annealing temperatures, indicating the thickness effect and Y can be refined grain size and improved ferromagnetic spin exchange coupling. The highest Ms and χac values of the Co60Fe20Y20 films were 883 emu/cm3 and 0.26 when the annealed temperature was 300 °C and the thickness was 50 nm. The optimal resonance frequency (fres) was 50 Hz with the maximum χac value, indicating it could be used at a low frequency range. Moreover, the surface energy increased with the increase of the thickness and annealing temperature. The maximum surface energy of the annealed 300 °C film was 30.02 mJ/mm2 at 50 nm. Based on the magnetic and surface energy results, the optimal thickness was 50 nm annealed at 300 °C, which has the highest Ms, χac, and a strong adhesion, which can be as a free or pinned layer that could be combined with the magnetic tunneling layer and applied in magnetic fields.

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Grain Refinement of Mg-Al Alloys by a New Al-4.1V-1.7B Refiner Containing Sole VB2 Particles

Fan

Bai

Zhang

et al. 2022

J. of Materi Eng and Perform

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The significant effect of trace yttrium level on the mechanical properties of cast Mg–6Al alloy through a refinement mechanism

Cited by 15 publications

References 34 publications

The effect of Y on the microstructure and mechanical performance of an Mg-Al-Y casting alloy

The effect of Y on the microstructure and mechanical performance of an Mg-Al-Y casting alloy

Effect of Yttrium Addition on Structure and Magnetic Properties of Co60Fe20Y20 Thin Films

Grain Refinement of Mg-Al Alloys by a New Al-4.1V-1.7B Refiner Containing Sole VB2 Particles

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