摘要
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.
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.
