Фазовая диаграмма системы Ag-Dy

К оглавлению: Другие диаграммы (Others phase diargams)


Ag-Dy (Silver-Dysprosium) K.A. Gschneidner, Jr. and F.W. Calderwood In the assessed Ag-Dy phase diagram, three congruently melting compounds exist- Ag51Dy14, Ag2Dy, and AgDy. Four eutectics also occur-(Ag)-Ag51Dy14, Ag51Dy14- Ag2Dy, Ag2Dy-AgDy, and AgDy-(aDy). The assessed temperatures are the average of values reported by [70Gsc], [76Del], and [78Guz]. The Ag-rich compound is Ag51Dy14, based on the data of [79Fer]. The solubility of Dy in (Ag) at 805 C is 1.3 at.% [70Mcm]. Ag2Dy is a compound with a narrow homogeneity range and a eutectic between Ag2Dy and AgDy at 37.5 at.% Dy. The solubility of Dy in Ag from 300 to 802 C is taken from [70Gsc], because of the purer metals used in this study. [78Guz] observed thermal effects at 1130 and 850 C in an Ag-96 at.% Dy alloy cooled from 1570 C at the rapid cooling rate of 30 C/min. These thermal arrests could be associated with the b <259> a transformation in Dy and with the AgDy-Dy eutectic, respectively. [76Del] reported difficulty in observing thermal effects in this composition region; thus, no details are shown in the assessed diagram for compositions above 90 at.% Dy, except the melting point and transformation temperatures of pure Dy metal. 70Gsc: K.A. Gschneidner, Jr., O.D. McMasters, D.G. Alexander, and R.F. Venteicher, Metall. Trans., 1, 1961-1971 (1970). 70Mcm: O.D. McMasters, K.A. Gschneidner, Jr., and R.F. Venteicher, Acta Crystallogr., B26, 1224-1229 (1970). 76Del: S. Delfino, R. Ferro, R. Capelli, and A. Borsese, J. Less-Common Met., 44, 267-271 (1976). 78Guz: L.S. Guzei, A.G. Slavev, M.V. Raevskaya, and E. M. Sokolovskaya, Vestn. Mosk. Univ., Khim., 33, 293 (1978); TR: Moscow Univ. Chem. Bull., 33, 47 (1978) . 79Fer: R. Ferro and S. Delfino, J. Less-Common Met., 68, 23-29 (1979). Published in Bull. Alloy Phase Diagrams, 6(1), Feb 1985. Complete evaluation contains 1 figure, 1 table, and 15 references. 1