A thermodynamic description of the Gd–Mg–Sm system

Guo, Cuiping; Du, Zhenmin; Li, Changrong

doi:10.1016/j.calphad.2009.12.006

Cited by 8 publications

(2 citation statements)

References 17 publications

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“…The phase diagrams of the Mg-RE (RE = La, Ce, Nd, Sm) systems calculated by Thermo-Calc software and the reported thermodynamic descriptions [25][26][27][28][29] are shown in Figure 1. The prepared alloys are located in two-phase regions at 673 K. The intermetallic compounds can be obviously observed in both as-cast and annealed alloys.…”

Section: Resultsmentioning

confidence: 99%

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Thermal Conductivity of As-Cast and Annealed Mg-RE Binary Alloys

Guo

Liu

Huang

et al. 2021

Metals

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Thermal conductivity and phase identification of Mg-RE (Rare-Earth) alloy (Mg-La, Mg-Ce, Mg-Nd, Mg-Sm) in both as-cast and annealed states were investigated. The thermal conductivity was measured by the laser flash method in the composition range of 4 wt.% to 12 wt.% RE and the temperature range of 298 K to 673 K. Results demonstrated that homogenization treatment can increase its thermal conductivity. The thermal conductivity increases with the increasing temperature in two states, which is inconsistent with the pure magnesium, and the thermal conductivity of Mg-RE alloys decreases with the alloy additions. Compared with the atomic radius, valence, and intermetallic compounds, the solid solubility of the above four RE elements in α-Mg plays a vital role in the thermal conductivity of Mg-RE binary alloy. The reduction of thermal conductivity caused by the addition of Nd and Sm, which show observable solid solubility in α-Mg, is significantly greater than the addition of La and Ce with negligible solid solubility in α-Mg.

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Section: Resultsmentioning

confidence: 99%

“…where, ρ 0 (kg/m 3 ) is the density at 298 K, T (K) is the absolute temperature. The specific heat capacity Cp (J/(g × K)) can be calculated using the Neumann-Kopp rule [22][23][24] combined with thermodynamic database [25][26][27][28][29].…”

Section: Methodsmentioning

confidence: 99%

Thermal Conductivity of As-Cast and Annealed Mg-RE Binary Alloys

Guo

Liu

Huang

et al. 2021

Metals

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Gd-Sm (Gadolinium-Samarium)

Okamoto

2012

J. Phase Equilib. Diffus.

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The Gd-Sm phase diagram in [Massalski2] was redrawn from [1983Gsc]. The two two-phase fields, L + (bGd, cSm) and (bGd, cSm) + (aGd, bSm), are so narrow that they were shown with straight lines. The (aSm) phase field was drawn vertically at (0°C, 60 at.% Sm) and smoothly connected to the bSm/aSm transition temperature (734°C) at 100 at.% Sm. This is based on the literature data that the maximum solubility of Gd in (aSm) is 40 at.%. Figure 1 shows the Gd-Sm phase diagram calculated by [2010Guo]. The narrow two-phase fields shown by [1983Gsc] could be reproduced, but the shape of the (aSm) phase field appeared differently. The shape shown in Fig. 1 is preferred because it is based on thermodynamics. Because there are no reliable experimental data, the trend of the (aSm) phase boundary is still tentative.

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