Фазовая диаграмма системы Al-Zr

К оглавлению: Другие диаграммы (Others phase diargams)


Al-Zr (Aluminum-Zirconium) A. Peruzzi and J.P. Abriata The equilibrium phases of the Zr-Al system are (1) the liquid, L; (2) the bcc ( bZr) and cph (aZr) solid solutions, for which the addition of Al stabilizes ( aZr) relative to (bZr), and the maximum solubilities of Al in (bZr) and (aZr) are 26 с 1 and 11.5 с 0.5 at.%, respectively; (3) the ten intermediate phases- Zr3Al, Zr2Al, Zr5Al3, Zr3Al2, Zr4Al3, Zr5Al4, ZrAl, Zr2Al3, ZrAl2, and ZrAl3- for which homogeneity ranges appear to be quite restricted; and (4) the fcc ( Al) solid solution, in which the maximum Zr solubility is 0.07 с 0.01 at.%. The solubility of Al in solid (Zr) is adopted from [55Mcp]. The stability ranges and structures of the intermediate phases were assessed based on [55Kee] , [55Mcp], [60Eds], [61Wil], [62Eds], [62Pot], [76Sch], [83Sch], [84Kem], and [ 85Kem]. The results of [59Gla] and [83Kuz] are accepted for the solubility of Zr in (Al). Rapid solidification produces metastable (Al) solid solutions at least up to ~3 at.% Zr [86Pan]. The microstructure of rapidly frozen alloys and its evolution on annealing were studied by [69Izu], [69Ryu], [72Nes], [72Oha], and [86Pan]. In the precipitation processes of the stable tetragonal ZrAl3 phase from supersaturated (Al), a metastable ZrAl3 compound with the AuCu3-type structure was observed by several investigators [69Ryu, 72Nes, 72Oha, 86Pan, 87Vec]. 55Kee: H.H. Keeler and J.H. Mallery, J. Met., (2), 394 (1955). 55Mcp: D.J. McPherson and M. Hansen, Trans. ASM, 46, 354-374. 59Gla: V.M. Glazov, G. Lasarev, and Korolkov, Metalloved. Term. Obrab. Met., ( 10), 48-54 (1959). 60Eds: L.-E. Edshammar and S. Andersson, Acta Chem. Scand., 14(1), 223-224 ( 1960). 61Wil: C.G. Wilson and D. Sams, Acta Crystallogr., 14, 71 (1961). 62Eds: L. Edshammar, Acta Chem. Scand., 16, 20-30 (1962). 62Pot: M. Potzschke and K. Schubert, Z. Metallkd., 53(8), 548-561 (1962). 69Izu: O. Izumi and D. Oelschlagel, Scr. Metall., 3, 619-622 (1969). 69Ryu: N. Ryum, Acta Metall. 17, 269-278 (1969). 72Nes: E. Nes, Acta Metall., 20, 499-506 (1972). 72Oha: T. Ohashi and R. Ichikawa, Metall. Trans., 3, 2300-2302 (1972). 76Sch: K.M. Schulson and D.R. Graham, Acta Metall., 24, 615-625 (1976). 83Sch: J.C. Schuster, J. Bauer, and J. Debuigne, J. Nucl. Mater., 116, 131-135 (1983). 84Kem: R.J. Kematick and H.F. Franzen, J. Solid State Chem., 54, 226-234 (1984) . 85Kem: R.J. Kematick, Ph.D. thesis, Iowa State University, IS T1148, DE85 009230, 1985. 86Pan: S.K. Pandey, D.K. Gangopadhyay, and C. Suryanarayana, Z. Metallkd., 77( 1), 12-16 (1986). 87Vec: K.S. Vecchio and D.B. Williams, Acta Metall., 35(12), 2959-2970 (1987). Submitted to the APD Program. Complete evaluation contains 5 tables, 3 figures, and 77 references Special Points of the Zr-Al System