Granularity Control of U-10wt%Mo Powder Prepared by HMD Method

The granularity control of U-10wt%Mo alloy powder prepared by hydriding-milling-dehydriding（HMD） method is introduced in this paper.U-Mo alloy is annealed for 4 h,10 h and 24 h at 950 ℃.Then U-Mo alloy powder is prepared through the process of γ→α phase transition,hydrid-ing-milling-dehydriding and α→γ phase transition.Analysis results indicates that the U-Mo grain grows slowly at 950 ℃,and the grain size could be controlled in the range of 40~100 μm by adjusting time.The γ-phase transition is strongly depended on the grain size,and when grain is big,γ→α phase transition is difficult.The powder size is related tightly with the grain size in the initial γ-phase alloy,and when γ-phase grain is big,the mass percent of coarse powder is high.