The high temperature phase diagrams for zirconium-molybdenum and hafnium-molybdenum
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d i a g r a m s of high melting refractory metals such as tungsten, rhenium, tantalum, and molybdenum with l o w e r melting m e t a l s are of g r e a t practical importance in assessing the usefulness of a r e f r a c tory m e t a l as a container for liquid metals and alloys. The determination of t h e s e phase d i a g r a m s by conventional metallurgical techniques is often difficult and time-consuming, and very few accurate data are available in the literature, especially for liquidus curves.I-3 The apparatus and b a s i c method utilized in this study have been described e a r l i e r4 but the considerable extension of the method and its adaption t o the Z r - M o and Hf-Mo binary systems r e q u i r e a more detailed description. The experimental effort of the present study can be divided into t h r e e p a r t s : I) solubility measurements of molybdenum in liquid zirconium and hafnium; 2) direct, repeated observations of melting, eutectic, peritectic, liquidus and solidus temperatures with a single sample; and 3) electron microprobe and metallographic analyses.
S. P.GARG was an International AtomicEnergy Fellow from the Metallurgy Division, Bhabha Atomic Research Centre, Trombay, India, temporarily attached to the Chemistry Division, ArgonneNationalLaboratory, Argonne IL 60439and R. J. ACKERMANN is with the Chemistry Division, ArgonneNational Laboratory. This work was performed at Argonne National Laboratory under the auspices ofthe U.S. Energy Researchand Development Administration. Manuscript submittedJune 25, t 976.
METALLURGICAL TRANSACTIONS A
I. EXPERIMENTAL TECHNIQUES AND RESULTS A) Measurements of Solubility For the solubility measurements a known amount of solvent metal, 50 t o 150 mg of Z r or Hf, was added t o a single crystal molybdenum cup located inside a tungsten effusion cell (Fig. l(a)). The assembly was heated inductively i n v a c u o (
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