Carbon solubility in Cu-based composite prepared by mechanical alloying
(1.Department of Materials Science and Engineering, Changchun Institute of Technology, Changchun 130012, China2.吉林省长春市吉林大学材料科学与工程学院教育部汽车材料重点实验室3.Key Laboratory of Automobile Materials, Ministry of Education, Department of Materials Science and Engineering;Jilin University, Changchun 130025, China4.Key Laboratory of Automobile Materials, Ministry of Education, Jilin University, Changchun 130025, China;)
Abstract: The powder mixture of Cu and graphite was mechanically alloyed (MA) in an oscillating type ball mill. The milling time was varied in order to investigate its influence on the microstructural evolution of mechanically alloyed powders. The phase constituent, alloying characteristics, grain size and lattice distortion of these powders were determined by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscopy. The results show that the C is confirmed to dissolve in the Cu lattice, forming solid solution of carbon in copper the lattice parameter of copper increases with carbon concentration increasing, up to a saturation value of about 4%C(mass fraction). Higher ball-mill energy is beneficial for twins and nanograin formation.
Key words: mechanical alloying; supersaturated solid solution; Cu-C system