Фазовая диаграмма системы Gd-Nd

К оглавлению: Другие диаграммы (Others phase diargams)

Gd-Nd (Gadolinium-Neodymium) K.A. Gschneidner, Jr. and F.W. Calderwood The assessed phase diagram for the Gd-Nd system, based on the work of [66Lun] and [75Sve], is characterized by complete solid solubility at all compositions in the high-temperature bcc phase. [75Sve] showed a single-phase region containing the Sm-type (d) structure, surrounded by a two-phase region containing the d phase mixed with (aGd) on one side and by the d phase mixed with (aNd) on the other side. [66Lun] reported that the compositional range for the Sm-type structure is from 40 to 60 at.% Nd. Because both end members are trivalent metals, the atomic numbers of the end- members differ by only four, and complete solid solubility exists in the high- temperature phase (bcc) region, a straight line has been used in the assessed diagram to represent the narrow gap [75Sve] reported between the liquidus and the solidus, and another straight line represents the area between the solvus lines at the transformation of the cph phases to the bcc phases. [66Jay] investigated pressure-induced transformation in a Sm-type Gd-50 at.% Nd alloy. After this alloy had been subjected to 40 kbar pressure at 450 C for 5 h, the pressure was released and the temperature was reduced to ambient. X-ray patterns revealed that the alloy had transformed to the dcph structure, which was retained metastably after the release of pressure. [70Spe] investigated the effect of rapid quenching on the Sm-type crystal structure of a Gd-50 at.% Nd alloy. X-ray patterns revealed that the quenched alloys were single phase and had the cph structure. 66Jay: A. Jayaraman, R.C. Sherwood, H.J. Williams, and E. Corenzwit, Phys. Rev. , 148, 502 (1966). 66Lun: C.E. Lundin, AD-633558 (also given as DRI-2326), final report, Denver Res. Inst., Univ. Denver, Denver, CO (1966). 70Spe: J.D. Speight, J. Less-Common Met., 20, 251 (1970). 75Sve: V.N. Svechnikov, G.F. Kobzenko, and E.L. Martynchuk, Dop. Akad. Nauk Ukr. RSR, B, 79 (1975). Published in Bull. Alloy Phase Diagrams, 3(3), Dec 1982. Complete evaluation contains 4 figures and 9 references. 1