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.

The p ha e diagrall\ of the uranium-plati num system \\'as constru cted from data 0 ' )-tained by therma l a na lysis, metallogmphic examina tio n, and X -my diffmction. Th e syste m is characle rized by foUl' intermetalli c co mpounds: U P t, formed pe rilcctoidall.v at, 9(j ] ° C; UPt2, fOfmed perilectically at 1,370° C; UPt3, melting congru enLl. \· at J ,700° C; and U P ts, formed perilectically at, : 1 ,460° C. One eu tectic occurs at 1,005° C and 12 a/o platinu m, and a second at 1,345° C and 87.5 a/o pla tinum. The m aximum solubiliti es a rc .. L5 a/ o u mnium in p latinum and 5 a/o plat inum ill gamma-uranium . Platin um lowc rs Lhe /l:a ll1m a-bl'la lImni1l111 transformalion to 705° C an d the bet.a-alpha transformat ion to . 589° C .

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The phase diagram of t he syst em silver-uranium was constru cted from dat a ob tained b y t hermal analysis, metallographic examinat ion, and X-ray diffrac tion. The syst e m is characte ri zed b y a eute ct ic having a composition of approximately 5 weight percent of uranium occurring at 950 0 C, and a monotectic occ urring a t 1,132 0 C, and 0.23 weight percen t of silver. The solid solubility of uranium in silve r appeared t o be between 0.1 and 0.4 weight percent a t the eu tect ic te mperat ure; no appreciable solubility of silver in uranium_ was noted . The te mperat ures of t he gamma-beta a nd t he beta-alpha t ransformat ion of uranium appare nt ly were unaffe cted by silver .

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