(1. 中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙410083；
2. 湖南工業(yè)大學(xué) 包裝與材料工程學(xué)院，株洲412008)
摘 要: 采用液相沉淀−熱還原法制備納米Fe包覆Mo合金粉末，研究還原過(guò)程中的晶粒組織及微結(jié)構(gòu)并進(jìn)行分析。結(jié)果表明：還原過(guò)程中，粉末晶粒平均晶粒尺寸隨還原溫度的升高而變小，微觀應(yīng)變?cè)谶€原溫度為600 ℃時(shí)最高，Mo晶粒先于Fe晶粒還原并長(zhǎng)大至1 μm左右，F(xiàn)e晶粒粒徑最終保持為1.8 nm，并形成20 nm左右的薄層，沉積在Mo顆粒表面。
關(guān)鍵字: 液相沉淀−熱還原；Fe-Mo；晶粒組織；微結(jié)構(gòu)
（1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. College of Packaging and Material Engineering, Hunan University of Technology, Zhuzhou 412008, China）
Abstract:Nanometer Fe coated Mo powders were prepared by liquid precipitation and thermal reduction. The grain structure and microstructure of materials during the reduction process were discussed. The results show that the average grain size of Fe coated Mo powders decrease with increasing reduction temperature, and the microstrain reaches the maximum at the reduction temperature of 600 ℃. The reduction of Mo grains precedes over Fe grains and the Mo grains grow significantly. The microstructure of the Fe coated Mo alloy powders is the Mo particles with the size about 1 μm coated layer-by-layer by metastable Fe grains and normal state Fe grains whose lattice constant closes to Mo grains, and the total thickness is around 20 nm.
Key words: liquid precipitation-thermal reduction; Fe-Mo; grain structure; microstructure
