Conferences

Constitution of Alloys and Phase Diagram of the Hf-Ru-Rh System.
IV. Liquidus Surface and Melting Diagram of the Partial Ru–HfRu–HfRh–Rh System

  
V.Khoruzhaya,
  
L.A.Duma,
  
V.B.Sobolev
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2016, #03/04
http://www.materials.kiev.ua/article/2173

Abstract

Based on the data obtained during study of the as-cast Hf–Ru–Rh alloys in the range of compositions 0−50 at. % Hf and in accordance with the solidus surface constitution, physicochemical analysis techniques are used to construct for the first time the liquidus surface of the Ru−HfRu−HfRh−Rh partial system onto the composition triangle, the melting diagram and the reaction scheme reflecting the processes during alloy crystallization. It is shown that five surfaces of primary crystallization of a continuous series of solid solutions between isostructural (CsCl-type) phases based on the HfRu compound and its high-temperature modification (δ phase), solid solutions based on ruthenium and rhodium, as well as the ε phase based on HfRh3 compound (AuCu3-type structure) and the θ phase on the basis of Hf3Rh5 compound (Hf3Rh5-type structure) are parts of the liquidus surface. Three invariant four-phase processes involving liquid proceed at 1900, 1810, and 1720 °С.


COMPOSITION TRIANGLE, LIQUIDUS SURFACE, MELTING DIAGRAM, PRIMARY SOLIDIFICATION, SOLID SOLUTION