Mg-Nd
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Supplemental Literature Review: Section III
Mg-Nd H. Okamoto
Introduction
References 1990Del: S. Delfino, A. Saccone, and R. Ferro, Phase Relationships in the Neodymium-Magnesium Alloy System, Metall. Trans. A, 1990, 21, p 2109-2114 1991Oka: H. Okamoto, Mg-Nd (Magnesium-Neodymium), J. Phase Equilibria, 1991, 12(2), p 249-250 2005Gor: S. Gorsse, C.R. Hutchinson, B. Chevalier, and J.F. Nie, A Thermodynamic Assessment of the Mg-Nd Binary System Using Random Solution and Associate Models for the Liquid Phase, J. Alloys Compounds, 2005, 392, p 253-262
The Mg-Nd phase diagram in [Massalski2] was updated by [1991Oka] based on the experimental work of [1990Del]. [2005Gor] tested two thermodynamic models to represent the liquid phase. One of the models named the associate model agreed better with the result of [1990Del] than the random solution model. Figure 1 shows the Mg-Nd phase diagram obtained by the former model. According to [1990Del], Mg12Nd reported earlier is metastable. This was confirmed by [2005Gor] by using scanning electron microscopy and X-ray diffraction.
Weight Percent Neodymium 0
20 30 40
50
60
80
70
90
100
1100 1021°C
1000
L 900 863°C 800
794°C
780°C
58.1
(βNd)
782°C 67
37
700
660°C
650°C 600
558°C 7.4
500
92.7
(αNd)
MgNd
300
82
Mg3Nd
400
(Mg)
553°C
Mg2Nd
548°C
Mg41Nd5
Temperature, °C
750°C 752°C
200
100 0
Mg
10
20
30
40
50
60
70
80
90
Atomic Percent Neodymium
100
Nd
Fig. 1 Mg-Nd Phase Diagram
Journal of Phase Equilibria and Diffusion Vol. 28 No. 4 2007
405
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