Analysis of phase in Cu-15%Cr-0.24%Zr alloy
(1. School of Energy and Power Engineering, University of Shanghai for Science and Technology,Shanghai 200093, China;2. School of Materials Science and Engineering, University of Shanghai for Science and Technology,Shanghai 200093, China)
Abstract: The vacuum medium-frequency induction melting technology was employed to prepare the Cu-15%Cr-0.24%Zr alloy. The scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM) were used to analyze the phase composition, morphology and structure of the alloy. The results reveal that the as-cast structure of the alloy consists of Cu matrix, Cr dendrite, eutectic Cr and Zr-rich phase. A large number of Cr-precipitated phases occur in the Cu matrix, and Cu5Zr particles can be found in the grain boundary of Cu matrix. The HRTEM images prove that there is a semi-coherent relationship between Cu5Zr and Cu matrix.
Key words: Cu-Cr-Zr alloy; as-cast structure; in-situ composite; precipitated phase