Al-Pr-Zr (Aluminum-Praseodymium-Zirconium)

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Phase Diagram Evaluations: Section II

Al-Pr-Zr (Aluminum-Praseodymium-Zirconium) V. Raghavan

Recently, an isothermal section at 500 °C was determined for this ternary system by [2010She], which depicts no ternary compounds.

phase diagram is not known. No intermediate phases were found in this system by [2010She].

Ternary Isothermal Section Binary Systems The Al-Pr phase diagram [Massalski2] shows the following intermediate compounds: aAlPr3 (D019, Ni3Sn-type hexagonal), bAlPr3 (L12, AuCu3-type cubic), AlPr2 (C23, Co2Si-type orthorhombic), aAlPr (AlEr-type orthorhombic), bAlPr (CeAl-type orthorhombic), Al2Pr (C15, MgCu2-type cubic), Al3Pr (Ni3Sn-type hexagonal), Al4Pr or bAl11Pr3 (D13, Al4Ba-type tetragonal), and aAl11Pr3 (aLa3Al11-type orthorhombic). The Al-Zr phase diagram [Massalski2] depicts the following intermediate phases: Al3Zr (D023-type tetragonal), Al2Zr (C14, MgZn2-type hexagonal), Al3Zr2 (Al3Zr2-type orthorhombic), AlZr (Bf, CrB-type orthorhombic), Al4Zr5 (Ga4Ti5-type hexagonal), Al3Zr4 (Al3Ir4-type hexagonal), Al2Zr3 (Al2Zr3-type tetragonal), Al3Zr5 (D8m, W5Si3-type tetragonal), AlZr2 (B82, Ni2In-type hexagonal), and AlZr3 (L12, AuCu3-type cubic). The Pr-Zr

With starting metals of 99.9% Al, 99.95% Pr and 99.95% Zr, [2010She] arc-melted under Ar atm a total of 59 binary and ternary alloys. The alloys were given a final anneal at 500 °C for >240 h and quenched in liquid nitrogen. The phase equilibria were studied with x-ray powder diffraction and scanning electron microscopy with energy dispersive spectroscopy. The isothermal section at 500 °C constructed by [2010She] is shown in Fig. 1. None of the binary compounds exhibit thirdcomponent solubility. No ternary phases were found.

Reference 2010She: J. She, Y. Zhan, C. Li, Y. Du, H. Xu, and Y. He, Phase Equilibria of the Al-Pr-Zr Ternary System at 773 K, J. Alloys Compd., 2010, 503, p 57-60

Fig. 1 Al-Pr-Zr isothermal section at 500 °C [2010She]. Narrow two-phase regions are omitted

Journal of Phase Equilibria and Diffusion Vol. 32 No. 1 2011

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