A study of the Al-Ni-Pt alloy system. Phase equilibria at 1100 and 1300°C

• Published in: Powder metallurgy and metal ceramics Vol. 50; no. 7-8; pp. 462 - 470
• Main Authors: Grushko, B., Kapush, D., Konoval, V., Shemet, V.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.10.2011; Springer; Springer Nature B.V
• Subjects: Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Glass; Materials Science; Metallic Materials; Natural Materials; Shape-memory alloys; phase diagrams; transition metal alloys and compounds
• ISSN: 1068-1302; 1573-9066
• DOI: 10.1007/s11106-011-9350-9

The Al-Ni-Pt phase diagram studied in the whole compositional region at 1300 and 1100°C. The Al 2 Pt phase found to extend up to at least Al 53 Ni 23 Pt 24 composition, separating the Al 3 Pt 2 and Al 3 Ni 2 phase fields. The Al-Ni β phase dissolves up to 38 at.% Pt at 1100°C, while at 1300°C the β region probably extends between the isostructural CsCl-type phases forming at the Al-Pt and Al-Ni terminals. The AlNi 3 phase (γ′) extends up to 35 at.% Pt at practically constant Al concentration, while the high-temperature AlPt 3 extends up to 15 at.% Ni. A ternary phase is formed in a wide compositional region between the regions of γ, γ′, β, and AlPt 3 . Apart from the AuCu-type structure of this ternary phase earlier reported, also its C-centered orthorhombic superstructure with a fourtimes larger unit cell revealed in the high-Al part of the compositional region.