Solidification pathways and constituent phases of Mg–Zn–Y–Zr alloys

Huang, Zhengren; Liang, Song‐Mao; Chen, Rongshi; Han, En‐Hou

doi:10.1016/j.jallcom.2008.01.034

Cited by 94 publications

(69 citation statements)

References 11 publications

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“…It is known that W-phase gradually exists with grid-like structure at the grain boundaries when Zn/Y ratio is closed to 1 [17] . According to previous studies [10][11][12] , W-phase could result in the difficulties Research & Development CHINA FOUNDRY The morphology of fracture for MgZn 4.5 Y x Zr 0.5 alloys is shown in Fig. 6.…”

Section: Phase Compositionsmentioning

confidence: 97%

“…A certain thickness of liquid film covering the grains has been formed in the end of solidification, which is the low-melting point eutectic phases. According to theory of liquid film [18,19] , the formation of hot cracks is determined by two factors, the existence of formed liquid film and the morphology of X-phase is propitious to feeding effect on separated dendrites [11] .…”

Section: Phase Compositionsmentioning

confidence: 99%

“…Huang et al [10,11] investigated the solidification path of Mg-Zn-Y alloys when Zn/Y ratio is between 0.33-3.33, and they found that Mg-Zn-Y alloys contain generally three kinds of ternary phases, which are the I-phase (Mg 3 Zn 6 Y, quasicrystal structure), W-phase (Mg 3 Zn 3 Y 2 , cubic structure) and X-phase (Mg 12 ZnY) according to different Zn/Y ratios. Meanwhile, Huang et al [10,11] found that adding a certain amount of Zr to the Mg-Zn-Y alloys could reduce their hot tearing susceptibility. Recently, Liu et al [12] conducted a systematic study on hot tearing behavior of MgZn 2.5 Y x Zr 0.5 alloys with different proportions between Zn and Y from 0.42 to 5.…”

mentioning

confidence: 99%

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Hot tearing susceptibility of MgZn4.5YxZr0.5 alloys and mechanism

Mao

Liu

et al. 2016

China Foundry

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Section: Phase Compositionsmentioning

confidence: 97%

Section: Phase Compositionsmentioning

confidence: 99%

mentioning

confidence: 99%

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Hot tearing susceptibility of MgZn4.5YxZr0.5 alloys and mechanism

Mao

Liu

et al. 2016

China Foundry

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“…Therefore, the I and/or Z phase-containing alloys have high mechanical properties, especially good high-temperature mechanical properties. 2,4,[10][11][12][13][14][15][16] But for the W phase, most of the existing investigations reported that it was not coherent with Mg matrix and the interface was easy to debond. 4,[17][18][19][20][21] Moreover, the W phase is also easy to crack.…”

Section: Introductionmentioning

confidence: 99%

“…The existing investigations have intensively investigated the effects of Zn/Y ratio on the formation of the ternary phases, the resulting microstructures and mechanical properties of as-cast or extruded alloys. 2,4,10,[17][18][19][20][21][22][23] Only one paper has involved the effects of Nd on the ternary phase formation and mechanical properties of as-cast Mg-Zn (-Y) alloys, but the similarities or differences between Y and Nd have not been indicated. 24) In addition, Zr is also a kind of necessary element for Mg-Zn-Y alloys and can signi cantly re ne primary α-Mg grains.…”

Section: Introductionmentioning

confidence: 99%

Effects of Nd or Zr Addition on Microstructure and Mechanical Properties of As-Cast Mg-Zn-Y Alloy

et al. 2016

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The effects of Nd or Zr addition on microstructure and mechanical properties of casting Mg-Zn-RE alloy have been investigated. The results indicate that the optimum contents of Nd and Zr are 0.5% and 0.3% respectively. The less or higher contents all increase grain size and accelerate the formation of shrinkage porosity, and thus decrease tensile properties and change fracture regime from transgranular mode to intergranular mode during tensile tests. The Mg-Zn-RE ternary phases transform from W (Mg 3 Zn 3 (Nd,Y) 2 ) in turn into W + Z (Mg 12 Zn(Nd,Y)) and Z as the Nd content increases and their distribution gradually changes from small discontinuous lath form to continuous network form. The grain bonding strength of an alloy with a certain amount of W phase that distributes in a discontinuous form is high than that of the alloy with the Z phase, and thus the W phase is an ideal strengthening phase. The alloy with 0.5 Nd and 0.3% Zr, named ZW21 alloy, has the smallest grains and highest grain bonding strength, and so has the highest comprehensive mechanical properties.

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Prediction of Shrinkage Microporosity in Gravity‐Cast and Low‐Pressure Sand‐Cast Mg–6Gd–3Y–0.5Zr Magnesium Alloys

Zhou

Chen

et al. 2019

Adv Eng Mater

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The Niyama criterion and the dimensionless Niyama criterion are used to predict shrinkage microporosity in Mg–6Gd–3Y–0.5Zr magnesium plates processed by gravity casting and low‐pressure sand casting. Instead of the Niyama evaluation condition recommended by commercial ProCAST software and precious studies, the most appropriate Niyama evaluation condition is suggested as fraction solid of 0.7 for the investigated alloys. With consideration of the actual distribution of shrinkage microporosity and the definition of unsound samples (shrinkage microporosity volume fraction is higher than 1% based on the tensile test), the corresponding threshold Niyama values are qualitatively determined as 0.44 and 0.3 °C0.5 s0.5 mm−1 for gravity‐cast and low‐pressure sand‐cast plates, respectively. It indicates that exerting pressure contributes to the decrease in the threshold Niyama value. In addition, exerting pressure can reduce the amount of shrinkage microporosity. For the dimensionless Niyama criterion, it is capable to quantitatively predict the shrinkage microporosity volume fraction in low microporosity‐containing regions, but not in high microporosity‐containing regions.

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Solidification pathways and constituent phases of Mg–Zn–Y–Zr alloys

Cited by 94 publications

References 11 publications

Hot tearing susceptibility of MgZn4.5YxZr0.5 alloys and mechanism

Hot tearing susceptibility of MgZn4.5YxZr0.5 alloys and mechanism

Effects of Nd or Zr Addition on Microstructure and Mechanical Properties of As-Cast Mg-Zn-Y Alloy

Prediction of Shrinkage Microporosity in Gravity‐Cast and Low‐Pressure Sand‐Cast Mg–6Gd–3Y–0.5Zr Magnesium Alloys

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