Papers by Author: Jun Li Cao

Abstract: The Cu-40wt%Zn-1.0wt%Bi-1.0wt%Mn bismuth-brass was prepared by casting and annealing. The microstructure was investigated by scanning electron microscopy (SEM), the phase composition was analyzed by X-ray diffraction (XRD), and the properties of mechanics and cutting were tested, too. The results show that the bismuth-rich phase is mainly distributed in the grain boundary as the shape of granules, which lead to the mechanics property and cutting property of bismuth-brass can basically reach the requirements of replace the traditional cutting-free brasses.

Abstract: Cu-0.2wt%Cr-0.5wt%Zr-0.1wt%RE(La) was prepared by casting, quenching, rolling and aging. The microstructure was studied by electron microscope and the texture components were studied by electron backscattered diffraction. In the cast alloy, pure chromium distributed near the grain boundary as a strip shaped and Cu5Zr phase distributed in the interior of grain as a shape of granules. The texture components of the rolled plate include {110} and {112}. With the rolling ratio increased, {112} texture component became the primary rolling texture component. The strengthening effect was attributed to the refinement of the grain size. The electron conductivity was mainly affected by the misorientation of the grain size with a high rolling ratio.