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对氢化-破碎-脱氢(HMD)法制备U-10wt%Mo合金粉末的粒度控制工艺进行了研究。U-Mo合金在950℃分别退火4、10、24 h,然后经过γ→α相转变热处理、HMD法和α→γ相转变热处理等过程成为粉末。分析结果表明:950℃下U-Mo晶粒长大较慢,可通过调节保温时间使晶粒尺寸控制在40~100μm;γ相分解程度强烈依赖于晶粒尺寸,晶粒尺寸越大,γ相向α相的转变程度越低;粉末粒度大小与原始合金γ相的晶粒度密切相关,原始合金γ相晶粒度越大,粉末粗粉比重越大。
The particle size control of U-10wt% Mo alloy powder by hydrogenation-crushing-dehydrogenation (HMD) was studied. U-Mo alloy were annealed at 950 ℃ for 4, 10, 24 h, respectively, and then were treated by γ → α transformation heat treatment, HMD method and α → γ phase transformation heat treatment. The results show that the grain size of U-Mo grows slowly at 950 ℃, and the grain size can be controlled to 40-100μm by adjusting the holding time. The degree of γ-phase decomposition strongly depends on the grain size. The larger the grain size, γ The degree of phase transition to α phase is lower; the particle size of the powder is closely related to the grain size of the γ phase of the original alloy. The larger the γ phase grain size of the original alloy is, the larger the specific gravity of the powder coarse powder is.