Effect of Mg24Y5 intermetallic particles on grain refinement of Mg-9Li alloy

Zeng, Ying; Jiang, Bin; Zhang, Mingxing; Yin, Heng-mei; Li, Ruihong; Pan, Fusheng

doi:10.1016/j.intermet.2013.09.005

Cited by 42 publications

(13 citation statements)

References 31 publications

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“…These two simulated angles are very close to the determined values (0.66 and 1.50 ). Previous work Fu et al, 2009;Wang, Qui et al, 2013;Fan et al, 2009;Li et al, 2012;Liu et al, 2014;Zeng et al, 2014) verifies that low f r and f d values are associated with a high nucleation potency of primary solids on the particles. Generally, for an effective nucleant, the values of f r and f d are lower than 7%.…”

Section: Figurementioning

confidence: 84%

Crystallography of grain refinement in cast zinc–copper alloys

et al. 2015

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Adding the peritectic forming element Cu effectively reduced the average grain size of cast Zn by over 85%. At a specified cast condition, the smallest grain size was obtained at 2 wt% Cu addition. A further increase in Cu content led to grain coarsening in the cast Zn-Cu alloys. Although the solute effect of Cu was predominately responsible for the grain refinement through restriction of the grain growth, it was found that the variation of grain size is also closely related to the formation of the pro-peritectic phase, "-CuZn 4 . Crystallographic calculations using the edge-to-edge matching model showed low interatomic misfit and interplanar mismatch between Zn and the "-CuZn 4 phase. In addition, a reproducible h.c.p.-h.c.p. (h.c.p. denotes hexagonal close-packed) orientation relationship between Zn and the "-CuZn 4 particles (located within the Zn grain centres) was also experimentally determined using the electron backscattered diffraction method. This indicated the high potency of the pro-peritectic "-CuZn 4 particles as effective heterogeneous nucleation sites for -Zn, which further refined the Zn grains. However, when the Cu content was over 2.0 wt%, formation of large "-CuZn 4 particles resulted in grain coarsening of the cast alloys.

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Section: Figurementioning

confidence: 84%

Crystallography of grain refinement in cast zinc–copper alloys

et al. 2015

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“…Generally, it is well known that the phases containing heavier elements exhibit brighter contrast in BSE images. In this work, most of element Y were consumed by the formation of I-phase and W-phase31323334, resulting in a very low solid solubility of Y in β-Li and α-Mg phases. However, Zhang et al .…”

Section: Resultsmentioning

confidence: 99%

Natural ageing responses of duplex structured Mg-Li based alloys

Wang

et al. 2017

Sci Rep

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Natural ageing responses of duplex structured Mg-6%Li and Mg-6%Li-6%Zn-1.2%Y alloys have been investigated. Microstructural analyses revealed that the precipitation and coarsening process of α-Mg particles could occur in β-Li phases of both two alloys during ageing process. Since a certain amount of Mg atoms in β-Li phases were consumed for the precipitation of abundant tiny MgLiZn particles, the size of α-Mg precipitates in Mg-6%Li-6%Zn-1.2%Y alloy was relatively smaller than that in Mg-6%Li alloy. Micro hardness measurements demonstrated that with the ageing time increasing, the α-Mg phases in Mg-6%Li alloy could have a constant hardness value of 41 HV, but the contained β-Li phases exhibited a slight age-softening response. Compared with the Mg-6%Li alloy, the age-softening response of β-Li phases in Mg-6%Li-6%Zn-1.2%Y alloy was much more profound. Meanwhile, a normal age-hardening response of α-Mg phases was maintained. Tensile results indicated that obvious ageing-softening phenomenon in terms of macro tensile strength occurred in both two alloys. Failure analysis demonstrated that for the Mg-6%Li alloy, cracks were preferentially initiated at α-Mg/β-Li interfaces. For the Mg-6%Li-6%Zn-1.2%Y alloy, cracks occurred at both α-Mg/β-Li interfaces and slip bands in α-Mg and β-Li phases.

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“…In addition, there zirconium-containing oxides also probably formed during stirring of the melt, where some zirconium particles might have directly exposed to the air. But considering that the density of zirconium oxide (5.89 g/cm 3 ) is close to that of pure zirconium (6.52 g/cm 3 ), their settling behavior in magnesiumlithium alloy melts may be treated as approximately the same [20]. For the block master alloy addition, a conspicuous decline in the number density of undissolved zirconium particles is found along the axial direction, Figure 5a, c. Compared with the bottom position, more the undissolved zirconium particles clusters (10 mm -50 mm) are observed at the top position, which have no effect on grain refinement and cause various microstructure defects.…”

Section: Distribution Of Undissolved Zirconium Particlesmentioning

confidence: 99%

“…Magnesium-lithium alloys have the potential applications for the light-weight demand components in various industries, such as aviation, aerospace and electronics due to their good plasticity and low density [1,2]. However, as-cast magnesium-lithium alloys have low strength and poor corrosion resistance, which limit their further applications [3]. It is well known that grain refinement is still an im-portant way to improve the strength by doping the magnesium-lithium alloy with other alloying elements [4,5].…”

Section: Introductionmentioning

confidence: 99%

A new approach to improving the macrosegregation in zirconium‐containing magnesium‐lithium alloy

Wang

Guan

et al. 2018

Materialwissenschaft Werkst

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In the preparation process of zirconium‐containing magnesium alloy, although zirconium is introduced into alloy by magnesium‐zirconium master alloy, the settling of zirconium particles has always been a key problem. In this study, the magnesium‐30wt.%zirconium master alloy was added into magnesium‐14wt.%lithium‐zinc alloy melt in the form of the block (about 20 mm) and the particles (about 20 μm), respectively, and then magnesium‐14wt.%lithium‐zinc with 0.5 wt.% zirconium alloy were prepared using stir‐casting process. Macrosegregation of major element (zirconium), microstructure and microhardness at different casting positions were examined to investigate the effect of zirconium addition methods on macrosegregation of magnesium‐14wt.%lithium‐zinc alloy. The results show that, for the block magnesium‐zirconium master alloy addition, there is obvious macrosegregation in alloy ingots, the zirconium contents at the top position of ingot are higher than that at the bottom by nearly 200 %. The method of particles master alloy addition can effectively improve macrosegregation, the difference in zirconium contents between the top and bottom is less than 16 %.

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Effect of Mg24Y5 intermetallic particles on grain refinement of Mg-9Li alloy

Cited by 42 publications

References 31 publications

Crystallography of grain refinement in cast zinc–copper alloys

Crystallography of grain refinement in cast zinc–copper alloys

Natural ageing responses of duplex structured Mg-Li based alloys

A new approach to improving the macrosegregation in zirconium‐containing magnesium‐lithium alloy

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