The tentative t itanium-uranium phase diagram has been amplified by thermal, microscopic, and X-ray analyses of a lloys in the range 0 to 30 atomic percent of titanium. The system is characterized by a peritectic reaction which occurs at 1,180 0 C, and by two solidsolu tion phases which decompose eutectoidly, one at 718 0 C and 5 atomic percent of titanium, the other at 830 0 C and 18.3 atomic percent of titanium. The alpha-beta transformation in uranium is increased from 657 0 to 667 0 C by titanium and the beta-gamma transformation is lowered from 768 0 to 718 0 C.

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