Фазовая диаграмма системы Pr-Y

К оглавлению: Другие диаграммы (Others phase diargams)


Pr-Y (Praseodymium-Yttrium) Editor The Pr-Y phase diagram was drawn by [Moffatt] to indicate the qualitative features of the system quoted in [66Har] regarding the boundaries of the d- phase region and [85Gsc] regarding similarity to the Gd-Nd system. [66Jay] investigated pressure-induced phase changes in several intrarare-earth alloy systems, including the Pr-Y system. A Pr-50 at.% Y alloy was observed to have the Sm-type structure after an annealing treatment at 500 C for several days. It was then subjected to 40 kbar pressure at 450 C for 5 h in a piston- cylinder apparatus. This alloy transformed to the dcph structure and retained this form at room temperature and atmospheric pressure. [76Wan] splat cooled alloys in the Pr-Y system and found that by splat cooling the cph phase range was extended to compositions which, under equilibrium conditions, should have the Sm-type structure. The Sm-type structure was pushed toward higher concentrations of Pr.-H.O. 66Har: I.R. Harris, C.C. Koch, and G.V. Raynor, J. Less-Common Met., 11, 436 ( 1966). 66Jay: A. Jayaraman, R.C. Sherwood, H.J. Williams, and E. Corenzwit, Phys. Rev. , 148, 502 (1966). 76Wan: R. Wang, Mater. Sci. Eng., 23, 135 (1976). 85Gsc: K.A. Gschneidner, Jr., J. Less-Common Met., 114, 29-42 (1985). This updates the evaluation by K.A. Gschneidner, Jr. and F.W. Calderwood published in Bull. Alloy Phase Diagrams, 3(2), Sep 1982. Complete evaluation contains 2 figures and 4 references. 1