Effects of Al Addition on Microstructure Evolution of Complex Nickel-silicon Brass
The ternary system phase diagrams of Cu-Ni-Si,Cu-Zn-Al as well as pseudo binary phase diagrams were obtained based on CALPHAD method to determine the composition of nickel-silicon brass with composite structure of hard β matrix+Ni2Si reinforcement phase.By adjusting Al content in Cu-36Zn-7Ni-2Si-x Al(mass fraction,%)alloy,it is found that when the Al content exceeds 1%,the alloy matrix(α+β)is transformed to single β phase.Meanwhile,the Ni2Si reinforcement phase distributed in the matrix exhibits continuous coral like(eutectic Ni2Si)and dispersed granular(primary Ni2Si)morphologies.With Al content increasing,the proportion of eutectic Ni2Si is firstly increased slightly and then decreased significantly,which approaches 0 when Al content reaches 3%.
万方数据
维普
