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Structure Transition of Nanocrystalline Fe_2O_3

Jian SHA , Xisheng YE , Bin CHEN , Qirui ZHANG and Zhengkuan JIAO(Dept. of Physics , Zhejiang University Hangzhou 310027 , China)Guanglie LU(Central Lab. , Hangzhou University Hangzhou 310028 , China)Zifen PENG and Lide ZHANG(Institute of Solid State Physics , Chi

材料科学技术（英文）

A structure transition of Fe2O3 nanocrystal was studied by using DTA and TG thermal analysis and X-ray diffraction method. We found that size increase of the nanocrystals is larger after the structure transition than that before the transition. It means that the structure transition is beneficial on growth of nanocrystals

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Formation of a FCC Al_(54)Ti_(23)C_(23) Metastable Phase by Ball Milling

Nianqiang WU , Zhizhang LI , Guangxin WANG and Jinming MU(Dept. of Materials Science and Engineering , Zhejiang University Hangzhou 310027 , China)

材料科学技术（英文）

The powder mixture of Al, Ti and graphite has been mechanically alloyed in a planetary ball mill.The structural evolution of as-milled powder sample has been characterized by XRD, DTA. The results show that the amorphous phase is formed first at an early milling stage, then crystallization occurs during further milling, leading to formation of a nanocrystalline fcc metastable phase. In contrast, during annealing the amorphous phase is crystallized to the equilibrium phase instead of the fcc phase. This indicates that crystallization during ball milling is different from that induced by annealing

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