Glass formation and crystallization behavior in Mg65Cu25Y10−xGdx (x=0, 5 and 10) alloys

Men, Hong; Kim, W.T.; Kim, D.H.

doi:10.1016/j.jnoncrysol.2004.03.110

Cited by 45 publications

(20 citation statements)

References 26 publications

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“…Whatever the extent of crystallization, it has been shown that these crystallites maintained a relatively constant size. [29] The nature of the crystals (Mg 2 Cu and Cu 2 Gd) was confirmed by XRD and is in agreement with the results obtained by Men et al [30] The presence of both sphere-shaped and rod-shaped particles in the Mg 65 Cu 25 Gd 10 BMG during crystallization is expected to affect the value of F max vol in Relation [2]. However, this possible variation is particularly difficult to estimate quantitatively, and it is the reason why predicted reinforcement factors as a function of F vol have been drawn for various values of F max vol in Figure 10.…”

Section: Quantification Of the Reinforcement Due To Partial Crystasupporting

confidence: 90%

Viscoplastic Forming of Mg Bulk Metallic Glasses in the Supercooled Liquid Region

Puech

Blandin

Soubeyroux³

2008

Metall Mater Trans A

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The Mg-Cu-rare earth (RE) alloys are produced under the form of amorphous cylindrical rods and characterized by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). Their capacity to be deformed in the supercooled liquid regions (SLRs) is studied. In the SLRs, crystallization can occur and strongly affect the viscoplastic forming conditions. Consequently, the thermal stabilities of the glasses are studied, in particular in the case of a Mg-Cu-Gd glass for which the kinetics of crystallization are quantified and the associated populations of crystallites identified. By appropriate heat treatments, various fractions of crystallites are thus produced and the effects of crystallization on the viscoplastic properties in the SLR are discussed in relation to mechanical models developed for materials containing rigid inclusions dispersed in a viscous medium. Finally, the possible effect of deformation on crystallization kinetics is also considered.

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Section: Quantification Of the Reinforcement Due To Partial Crystasupporting

confidence: 90%

Viscoplastic Forming of Mg Bulk Metallic Glasses in the Supercooled Liquid Region

Puech

Blandin

Soubeyroux³

2008

Metall Mater Trans A

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“…Stages II and III were hardly noticeable on the isochronal [10] and isothermal [5] DSC traces. This indicates that the energy difference between the products of the later stages is small, whereas the structural difference is prominent.…”

Section: A Transformation Stagesmentioning

confidence: 93%

“…[1] Among the Mg-Ln-TM (Ln = lanthanide metal, and TM = Ni, Cu, or Zn) alloys, Mg 65 Cu 25 Y 10 has been reported to have very good glass forming ability (GFA) with a critical casting thickness around 5 mm and a temperature interval DT X of 69 K. [2] GFA could be further improved by replacing Cu partially with noble metal atoms [3] or Zn, [4] or replacing Y with rare-earth (RE) atoms. [5,6] The best Mg-based glass formers have the general composition of Mg65-TM25-Ln10. Study of this system also has academic significance because these ternary alloys are simpler than the quinary Zr-based BMGs, and the atomic packing is quite different because of the presence of large RE atoms.…”

Section: Introductionmentioning

confidence: 99%

Multistage Devitrification Behavior of Mg65Cu25Tb10 Bulk Metallic Glass

Yang

Wang

Stoica

et al. 2008

Metall Mater Trans A

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The devitrification of Mg 65 Cu 25 Tb 10 bulk metallic glass (BMG) has been studied by timeresolved small angle X-ray scattering (SAXS) and wide angle X-ray scattering (WAXS) simultaneously. By analyzing the interference peaks on SAXS patterns and the Bragg peaks on WAXS patterns, it is found that devitrification initiates by activation of quenched-in shortrange orders. Crystallization proceeds in three stages. During stage I, icosahedral clusters are formed that transforms to a quasi-crystalline 1/1 approximant during stage II, accompanied by the formation of cubic TbMg 3 . In stage III, the 1/1 approximant transforms to a 2/1 approximant. The orthorhombic CuMg 2 phase is formed at a higher temperature when the quasicrystalline phase starts to decompose. Pair distribution functions were evaluated to demonstrate these structural evolutions in real space.

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“…Due to the combined effects of a large difference in atomic size between Ag and the constituting elements and the larger mixing enthalpy of Ag-Mg and Ag-Y than those of Cu, the addition of Ag would contribute to increase the atomic packing density of the liquid structure and GFA. Men et al [7] also investigated the effect of substitution of Y in the Mg 65 Cu 25 Y 10 alloy with Gd on the GFA and crystallization behavior. Due to the difference in electronic configuration between Y (4d 1 5s 2 ) and Gd (4f 7 5d 1 6s 2 ), it results in a certain change of the short-range order in the supercooled liquid of Mg-Cu-Y-Gd alloys and shows a higher GFA.…”

Section: Introductionmentioning

confidence: 99%