Effect of TiBor on the grain refinement and hot tearing susceptibility of AZ91D magnesium alloy

Davis, T. A.; Bichler, Lukas; D’Elia, F.; Hort, Norbert

doi:10.1016/j.jallcom.2018.05.129

Cited by 42 publications

(15 citation statements)

References 19 publications

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“…It was found that when Zn content was 3 wt%, the corresponding LPSO phase fraction was 18.3%, W-phase fraction was 4.6%; when Zn content was 5 wt%, the corresponding LPSO phase fraction was 21.2%, W-phase fraction was 12.6%; when Zn content was 7 wt%, the corresponding LPSO phase almost disappeared, W-phase fraction was 35.9%. It can also be seen from Figure 4 that the final grains size decreased significantly with the increase of Zn content, which should be beneficial to the reduction of HTS [10,36].…”

Section: Phase Composition and Microstructurementioning

confidence: 80%

“…almost disappeared, W-phase fraction was 35.9%. It can also be seen from Figure 4 that the final grains size decreased significantly with the increase of Zn content, which should be beneficial to the reduction of HTS [10,36].…”

Section: Phase Composition and Microstructurementioning

confidence: 80%

“…Furthermore, the EBSD pole figures of Mg-7Gd-5Y-xZn-0.5Zr alloys are shown in Figure 7. Obviously, the four alloys all had the crystallographic texture which was generally considered as {0001} basal plane was parallel to the direction of heat flow [36], but the texture strength decreased with the increase of Zn content. This showed that, on the one hand, the non-close-packed surface perpendicular to the close-packed surface had a preferential growth trend, but it decreased with the increase of the solute atom segregation at the solidification front.…”

Section: Solidification Characteristicsmentioning

confidence: 99%

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Effects of Zn Content on Hot Tearing Susceptibility of Mg–7Gd–5Y–0.5Zr Alloy

Wei

Liu

et al. 2020

Metals

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Mg–7Gd–5Y–0.5Zr alloy has excellent mechanical properties but poor hot tearing resistance. The latter makes it difficult to cast billets, which limits the size of subsequently processed parts. Therefore, the hot tearing susceptibility of Mg–7Gd–5Y–xZn–0.5Zr (x = 0, 3, 5, 7 wt%) alloys was studied. It was found that Zn can significantly reduce hot tearing susceptibility of Mg–7Gd–5Y–0.5Zr alloy, which almost linearly decreased with Zn content. When Zn content was 3 wt%, 5 wt% and 7 wt%, hot tearing susceptibility will be reduced by 27%, 83% and 100%, respectively. It was further revealed that the solid solubility of Gd and Y in α-Mg decreased with the increase of Zn content, and the nucleation temperature decreased accordingly, which resulted in the increase of nucleation rate and the refinement of final grains. On the macro level, it showed that the dendrite coherency temperature decreased, the solidification shrinkage stress of α-Mg slowed down, and the residual liquid channel became shorter and hot tearing susceptibility decreased. It was also found that with the increase of Zn content, the content of Zn, Gd and Y enriched on the grain boundary increased, the content of residual liquid phase between dendrites increased after α-Mg crystallization, and the solidified precipitated second phase also changed from Mg5RE phase to long-period stacking ordered phase + W-phase (a little), long-period stacking ordered phase + W-phase (much) and finally to W-phase only. The feeding effect of sufficient intergranular residual liquid on the shrinkage of α-Mg dendrite and the bridging effect of the precipitated phase at the grain boundary (especially long-period stacking ordered phase which is coherent with the parent phase) also led to the decrease of hot tearing susceptibility.

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Section: Phase Composition and Microstructurementioning

confidence: 80%

Section: Phase Composition and Microstructurementioning

confidence: 80%

Section: Solidification Characteristicsmentioning

confidence: 99%

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Effects of Zn Content on Hot Tearing Susceptibility of Mg–7Gd–5Y–0.5Zr Alloy

Wei

Liu

et al. 2020

Metals

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“…This study found that the liquidus temperature of the AZ91D magnesium alloy was 595°C, and the solidus temperature was 470°C (Sumida et al , 2009; Zhang et al , 2010; Davis, 2019). The average free-line shrinkage of this alloy was 1.572%.…”

Section: Theory and Methodsmentioning

confidence: 94%

Study on casting design and analysis of magnesium alloy wheel

Jiang¹,

Hu²,

Liu³

et al. 2021

MMMS

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PurposeThis research establishes a suitable casting model for magnesium alloy wheel. The casting of the wheel is an element that must be considered in the design of the wheel. Casting is an important basic process and technology in the field of machinery which is widely used in production, transportation, national defense, social life and other aspects. Computer numerical simulation of the casting process can shorten the product manufacturing cycle, reduce product costs, reduce casting defects and ensure product quality. The casting material in this study is AZ91 magnesium alloy used for wheel lightweight.Design/methodology/approachLightweight research of automobile is a significant trend, and people are paying attention to the lightweight design of automobiles. Higher requirement was proposed on design and casting performance of the wheel which is an important part of lightweighting vehicle. In order to achieve better quality, the parametric studies of alloy wheel and casting are necessary. This research designs a new model of automobile wheel, to ensure energy efficiency, the wheels must be as lightweight as possible, using magnesium alloy material for lightweight.FindingsAnalysis of casting process is a very complex issue. This research based on finite element theory and actual production, designed reasonable casting model, instant filling and solidification data were obtained. Aiming at reducing casting defects, process improvement of casting riser structure was designed. On the basis of the foundation, it has important guiding significance for actual foundry production.Originality/valueThis research establish a suitable casting model for magnesium alloy wheel. Aiming at reducing casting defects, process improvement of casting riser structure were designed.

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“…[9][10][11][12][13] In particular, the addition of rare earth elements can effectively refine the alloy grains, reduce the hot tearing tendency and improve the comprehensive properties of the alloy. [14][15][16][17][18][19] Chen et al 20 and Tao et al 21 studied the effect of La addition on the hot tearing of 2-Series aluminum alloy, and found that La can refine the alloy grain. In addition, the formed Al 6 Cu 6 La phase can change the composition of intercrystalline liquid phase at the late solidification stage and reduce the hot tearing tendency of Al-Cu alloy.…”

Section: Introductionmentioning

confidence: 99%

Effect of Y Element on Microstructure and Hot Tearing Sensitivity of As-Cast Al–4.4Cu–1.5Mg–0.15Zr Alloy

et al. 2021

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In this paper, the effect of Y content on hot tearing properties of cast Al-Cu-Mg alloy was studied. The effect and mechanism of Y on hot tearing of cast Al-4.4Cu-1.5Mg-0.15Zr alloy were studied by analyzing the microstructure evolution, phase structure, solidification process and hot tearing sensitivity coefficient of the alloy with different Y additions, and determined the appropriate amount of Y element. The results showed that Y improves hot tearing resistance of Al-4.4Cu-1.5Mg-0.15Zr alloy by refining microstructure and reducing the solidification temperature range. The suitable amount of Y is 0.15 wt%. At this time, a certain amount of Al 6 Cu 6 Y low melting point phase is formed in the alloy, and the grain structure is the smallest, which significantly improves the hot tearing resistance of Al-4.4Cu-1.5Mg-0.15Zr alloy. The microstructure coarsening and hot tearing tendency increase with increasing Y content. The experimental results are basically consistent with the hot tearing sensitivity predicted by the Clyne-Davies model.

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Effect of TiBor on the grain refinement and hot tearing susceptibility of AZ91D magnesium alloy

Cited by 42 publications

References 19 publications

Effects of Zn Content on Hot Tearing Susceptibility of Mg–7Gd–5Y–0.5Zr Alloy

Effects of Zn Content on Hot Tearing Susceptibility of Mg–7Gd–5Y–0.5Zr Alloy

Study on casting design and analysis of magnesium alloy wheel

Effect of Y Element on Microstructure and Hot Tearing Sensitivity of As-Cast Al–4.4Cu–1.5Mg–0.15Zr Alloy

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