The directional solidification of Cu0.8 wt%Cr alloy was investigated. An nonequilibrium microstructure with the primary α(Cu) dendrites and the [α(Cu)+β(Cr)] eutectics is formed during the directionally solidifying...The directional solidification of Cu0.8 wt%Cr alloy was investigated. An nonequilibrium microstructure with the primary α(Cu) dendrites and the [α(Cu)+β(Cr)] eutectics is formed during the directionally solidifying process, when the temperature gradient ahead of the S/L interface is 30℃/cm, and the growth velocities are 3 μm/s and 30 μm/s respectively. The arm spacing of the primary αcrystals is increased with the increase of the growth rate, which is not consistent with the KurzFisher model but with the Hunt model at low velocity. The growth conditions of a fibrelike chromium phase are also discussed.展开更多
Thesolidification processof Al 7 5% Mg Zn alloys wasstudiedin thepaper.The Zn contentand cooling rate werechanged andtheirinfluenceson as cast microstructure were measured by different methods. The solute segrega...Thesolidification processof Al 7 5% Mg Zn alloys wasstudiedin thepaper.The Zn contentand cooling rate werechanged andtheirinfluenceson as cast microstructure were measured by different methods. The solute segregation during nonequilibrium solidification process wascalculated byternary Scheilequation which wasin good agreement with experimentresulte.展开更多
文摘The directional solidification of Cu0.8 wt%Cr alloy was investigated. An nonequilibrium microstructure with the primary α(Cu) dendrites and the [α(Cu)+β(Cr)] eutectics is formed during the directionally solidifying process, when the temperature gradient ahead of the S/L interface is 30℃/cm, and the growth velocities are 3 μm/s and 30 μm/s respectively. The arm spacing of the primary αcrystals is increased with the increase of the growth rate, which is not consistent with the KurzFisher model but with the Hunt model at low velocity. The growth conditions of a fibrelike chromium phase are also discussed.
文摘Thesolidification processof Al 7 5% Mg Zn alloys wasstudiedin thepaper.The Zn contentand cooling rate werechanged andtheirinfluenceson as cast microstructure were measured by different methods. The solute segregation during nonequilibrium solidification process wascalculated byternary Scheilequation which wasin good agreement with experimentresulte.
