Abstract
The Nd-Mg system was studied using differential thermal analysis (DTA), X-ray examination, metallography, and microprobe analysis. The following intermetallic compounds were found to exist and their crystal structures confirmed or determined: NdMg (cubic, cP2 CsCl type, melting point 800 °C), NdMg2 (cubic, cF24 MgCu2 type, peritectic formation ∼755 °C), NdMg3 (cubic, cF16 BiF3 type, melting point 780 °C), and Nd5Mg41 (tetragonal, tI92 Ce5Mg41 type, decomposes peritectically at 560 °C). The NdMg2 phase undergoes a eutectoidal decomposition at 660 °C. Three eutectic equilibria were observed to occur at 42.5 at. pct Mg and 775 °C, 64.5 at. pct Mg and 750 °C, and 92.5 at. pct Mg and 545 °C, respectively. In the Nd-rich alloys, previously determined data[15] concerning the Mg solubility in α-Nd (8.2 at. pct Mg, ≈550 °C) were accepted. The Mg solubility in β-Nd was evaluated as 34 at. pct Mg at 775 °C. The β-Nd phase was observed to decompose eutectoidally at 17 at. pct Mg and 545 °C. Moreover, in the Mgrich alloys, a metastable NdMg12 phase (tetragonal, tI26 ThMn12 type) was observed in samples quenched from the liquid. The general properties of the Nd-Mg phases are compared with those of the R-Mg compounds and briefly discussed.
Similar content being viewed by others
References
A. Saccone, S. Delfino, G. Borzone, and R. Ferro:J. Less-Common Met., 1989, vol. 154, pp. 47–66.
K. A. Gschneidner, Jr.:J. Less-Common Met., 1969, vol. 17, pp. 1–12.
C. Colinet, A. Pasturel, A. Percheron-Guegan, and J. C. Achard:J. Less-Common Met., 1984, vol. 102, pp. 167–77.
S. Steeb, E. Gebhardt, and H. Reule:Monatsh. Chem., 1972, vol. 103, pp. 716–35.
S. P. Yatsenko, A. A. Semyannikov, B. G. Semenov, and K. A. Chuntonov:J. Less-Common Met., 1979, vol. 64, pp. 185–99.
S. P. Yatsenko, A. A. Semyannikov, H. O. Shakarov, and E. G. Fedorova:J. Less-Common Met., 1983, vol. 90, pp. 95–108.
S. Delfino, A. Saccone, and R. Ferro:J. Less-Common Met., 1984, vol. 102, pp. 289–310.
G. Borzone, A. Borsese, and R. Ferro:Z. Anorg. Allg. Chem., 1983, vol. 501, pp. 199–208.
C. Colinet, A. Pasturel, A. Percheron-Guegan, and J. C. Achard:J. Less-Common Met., 1984, vol. 102, pp. 239–49.
A. Saccone, S. Delfino, and R. Ferro:J. Less-Common Met., 1988, vol. 143, pp. 1–23.
R. Vogel and T. Heumann:Z. Metallkd., 1947, vol. 38, pp. 1–8.
P. Manfrinetti and K. A. Gschneidner, Jr.:J. Less-Common Met., 1986, vol. 123, pp. 267–75.
A. A. Nayeb-Hashemi and J. B. Clark:Bull. Alloy Phase Diagrams, 1988, vol. 9, pp. 162–72.
J. J. Park and L. L. Wyman: Phase Relationships in Magnesium Alloys, WACD Technical Report 57-504, 1957, p. 33; ASTA Document No. 142110, Wright-Patterson Air Force Base, OH.
R. R. Joseph and K. A. Gschneidner, Jr.:Trans. AIME, 1965, vol. 233, pp. 2063–69.
A. Iandelli and A. Palenzona:J. Less-Common Met., 1965, vol. 9, pp. 1–6.
C. C. Chao and P. Duwez:J. Appl. Phys., 1966, vol. 37 (7), pp. 2631–32.
K. H. J. Buschow:J. Less-Common Met., 1973, vol. 33, pp. 239–44.
A. Iandelli: Symp. The Physical Chemistry of Metallic Solutions and Intermetallic Compounds, National Physical Laboratory, Teddington, Middlesex, United Kingdom, 1959, vol. I, paper 3F, pp. 1–11.
K. H. J. Buschow, R. C. Sherwood, and F. S. L. Hsu:J. Appl. Phys., 1978, vol. 49, pp. 1510–12.
K. H. J. Buschow:J. Less-Common Met., 1976, vol. 48, pp. 301–06.
R. M. Galera, A. P. Murani, and J. Pierre:J. Magn. Magn. Mater., 1981, vol. 23, pp. 317–22.
P. I. Kripyakevich and V. I. Evdokimenko: Visn. L’vivs. Derzh. Univ. Ser. Khim., 1969, pp. 3-6.
V. I. Evdokimenko and P. I. Kripyakevich:Sov. Phys. Crystallogr. (Engl. Transi.), 1963, vol. 8, pp. 135–41.
J. R. Ogren, N. J. Magnani, and J. F. Smith:Trans. AIME, 1967, vol. 239, pp. 766–71.
J. E. Pahlman and J. F. Smith:Metall. Trans., 1972, vol. 3, pp. 2423–32.
Yu. A. Frolov, A. P. Bayanov, Yu. A. Afanaslev, and S. D. Barabashova:Russ. J. Phys. Chem., 1974, vol. 48, pp. 1423–24.
A. Saccone, G. Borzone, S. Delfino, G. Cacciamani, and R. Ferro:Proc. XViemes Journees d’Etude des Equilibres Entre Phases, Grenoble, France, Mar. 22–23, 1989, Laboratoire de Thermodynamique et Physico-Chimie Metallurgiques ENSEEG, St. Martin D’Heres, p. 29.
A. A. Nayeb-Hashemi and J. B. Clark:Bull. Alloy Phase Diagrams, 1988, vol. 9 (5), pp. 618–23.
S. Delfino, A. Saccone, G. Cacciamani, and R. Ferro:Z. Metallkd., 1987, vol. 78, pp. 344–51.
B. J. Beaudry and K. A. Gschneidner, Jr.: in Handbook on the Physics and Chemistry of Rare Earths, Vol. 1—Metals, K.A. Gschneidner, Jr. and L. Eyring, eds., North-Holland Publishing Co., Amsterdam, The Netherlands, 1978, pp. 173–232.
P. Villars and L. D. Calvert: Pearson’s Handbook of Crystallo-graphic Data for Intermetallic Phases, ASM, Metals Park, OH, 1985, vol. 3.
D. S. Evans and A. Prince:Thermochim. Acta, 1982, vol. 58, pp. 199–209.
O. D. McMasters and K. A. Gschneidner, Jr.:J. Less-Common Met., 1914, vol. 38, pp. 137–48.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Delfino, S., Saccone, A. & Ferro, R. Phase relationships in the neodymium-magnesium alloy system. Metall Trans A 21, 2109–2114 (1990). https://doi.org/10.1007/BF02647869
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02647869