Characteristics of mechanically alloyed Cu, C and Cr mixed powders
来源期刊：中国有色金属学报2000年第z1期
论文作者：齐宝森 王成国 姚新 彭其凤
文章页码：33 - 35
Key words：composite powders； super-saturated solid solution； mechanical alloying； mechanochemical reaction
Abstract: The characteristics of morphologies and changes of the microstructures in mechanically alloyed （MA） （m（Cr）∶m（C）∶m（Cr）=90∶1∶9） mixed powders were investigated by using SEM observation and X-ray diffraction （XRD） analyses. The results show that Cu, C and Cr mixed powders mechanically alloyed for 12 h forms the Cu-based super-saturated solid solution; after high energy ball-milling for 96 h the partial solute elements Cr and C precipitate, meanwhile, the mechanochemical reactions take place and the carbides Cr7C3 form. The composite powders after mechanically alloyed are fine and flat. The formed defects such as free surface, grain boundary, sub-grain boundary and dislocation decrease diffusion activity energy, which is the important reason for developing super-saturated solid solution and promoting the second phase precipitation.
