REFRACTORY METALS AND ALLOYS.

The original mater ia l s f rom which the alloys were prepared were commerc ia l molybdenum (99.97~c), e lectrolyt ic rhenium (99.99%) remel ted in an a rc furnace for additional purification, and iodide zirconium. Carbon was added in the form of Mo2C and spect ra l ly pure graphite. Ingots of the al loys weighing 250 g (150 mm long and 8-10 mm in diameter) were melted in a furnace with a nonconsumable tungsten electrode and water -cooled copper hearth in an a tmosphere of helium at a p ressure of 300 mm Hg.