【作者】 李定朋； 宋晓艳； 张哲旭； 徐文武； 刘雪梅；

【Author】 Li Dingpeng;Song Xiaoyan;Zhang Zhexu;Xu Wenwu;Liu Xuemei;College of Materials Science and Engineering,Beijing University of Technology;

【机构】 北京工业大学材料学院新型功能材料教育部重点实验室；

【摘要】 由于Sm元素性质活泼,在高温极易挥发和氧化,常规的方法制备富Sm型Sm-Co合金极难保证物相纯净的同时解决好氧化的问题。因此受到制备技术的限制,对富Sm型Sm-Co合金块体材料的研究报道非常少,尤其是对单相富Sm型Sm-Co合金块体的研究更是鲜有报道。本文针对富Sm相合金的特点,首次提出了一种超细均匀Sm5Co2纳米晶合金块体的制备方法:用真空感应熔炼炉制备出单相母合金铸锭作为初始材料,然后采用高能球磨的方法获得Sm5Co2的非晶态合金粉末,最后利用放电等离子烧结技术制备出完全致密的单相Sm5Co2纳米晶合金块体材料。通过对制备得到的单相的Sm5Co2纳米晶合金进行显微分析,晶粒组织细小均匀,平均晶粒尺寸达到10nm。此外,本文对获得的单相Sm5Co2纳米晶合金块体材料的磁性能和力学性能进行了详细的表征。更多还原

【Abstract】 As the Sm element has active property and highly evaporation, it is oxidized easily at high temperature. It is extremely difficult to ensure the phase purity and solve the oxidation problem simultaneously with the conventional method to prepare Sm-rich Sm-Co alloys. It has not been reported recently the studies of nanocrystalline Sm-rich Sm-Co alloy bulk with a single-phase structure to our knowledge. To overcome these two problems mentioned above, our group proposed a novel way to prepare nanocrystalline Sm5Co2 alloy with single-phase and homogenous grain structure: firstly, using vacuum induction melting to prepare single-phase parent alloy ingot; secondly, Sm5Co2 amorphous alloy powder was obtained by high-energy ball milling; finally, using spark plasma sintering technology to prepare a fully dense nanocrystalline Sm5Co2 bulk with single-phase structure. The microstructure and phase constitution were characterized by TEM and XRD. The results show that the nanocrystalline Sm5Co2 alloy has ultra-fine and homogenous nanograin structure, and the average grain size is around 10 nm. Moreover, the magnetic and mechanical properties of Sm5Co2 nanocrystalline bulk were characterized in detail for the first time.更多还原