Фазовая диаграмма системы Al-Dy

К оглавлению: Другие диаграммы (Others phase diargams)

Al-Dy (Aluminum-Dysprosium) Editor The assessed phase diagram for the Al-rich portion of the Al-Dy system is based primarily on the work of [67Cas]. The Dy-rich portion of the Al-Dy diagram is redrawn from [Moffatt], who assumed that the L = AlDy3 + (Dy) eutectic point reported by [64Cop] is actually the L = AlDy2 + (Dy) eutectic point, because AlDy3 is a carbon-stabilized compound [67Bus]. The Al-rich compound, Al3Dy, has the hexagonal Ni3Sn-type structure below about 1005 C, where it transforms to rhombohedral Al3Ho-type structure. The b form deviates in stoichiometry toward higher Dy content and decomposes peritectically to Al2Dy and the melt at 1090 C. The latter phase, which has the cubic Cu2Mg- type structure, melts congruently at 1500 C. A eutectic between Al and Al3Dy occurs at 636 C, with a composition of about 2.5 at.% Dy. Other compounds that have been reported are AlDy2 (orthorhombic Co2Si type), Al2Dy3 ( tetragonal Al2Zr3 type), and AlDy (orthorhombic AlEr type). No melting data are available for these forms.-H.O. 64Cop: M. Copeland and H. Kato, Physics and Material Problems of Reactor Control Rods, Int. At. Energy Agency, Vienna, 295-317 (1964). 67Bus: K.H.J. Buschow and J.H.N. van Vucht, Philips Res. Rep., 22, 233-245 ( 1967). 67Cas: F. Castels, P. Diels, and A. Cools, J. Less-Common Met., 12, 210 (1967). This supersedes the evaluation by K.A. Gschneidner, Jr. and F.W. Calderwood published in Bull. Alloy Phase Diagrams, 9(6), Dec 1988. Complete evaluation contains 1 figure, 1 table, and 30 references. 1