THE METALLURGY OF YTTRIUM AND THE RARE EARTH METALS PART I. PHASE RELATIONSHIPS

摘要

Partial constitutional diagrams were established for sixteen binary systems containing rare earth metals. These studies were made as the first step in efforts to produce alloys with improved mechanical properties.nErbium and yttrium form simple binary eutectic systems with titanium. No compounds are present. The transition temperature of titanium is not significantly affected. Copper, tin, and cobalt form intermetallic compounds with erbium and yttrium. The melting points of the rare earths are rapidly lowered, eutectics forming with the respective compounds. Vanadium forms extensive (and chromium forms limited) liquid immiscibility regions with erbium and yttrium. Eutectics are formed at the rare earth end of these systems. Terminal solubilities are low in all of the above systems.nThe results obtained suggest zirconium as a promising alloy¬ing element. Evidence was also found for the purification of vanadium and beryllium when these metals were melted together with rare earths.