Microstructure of directionally solidified Cu-Cr composites
来源期刊：中国有色金属学报(英文版)2004年第1期
论文作者：毕晓勤 李金山 胡锐 耿兴国 朱琦 傅恒志
文章页码：137 - 142
Key words：directional solidification; Cu-Cr alloy; composite
Abstract: Cu-Cr composites were prepared by self-made directional solidification equipment with the high temperature gradient and double-zone heating. The microstructural evolution was investigated during the directional solidification with the different solidification rate for Cu-1.0%Cr, Cu-1.7%Cr and Cu-5.6%Cr alloys, respectively. It is shown that for the hypoeutectic Cu-1.0%Cr alloy, the general microstructures consist of primary α(Cu) phase and the rod-like or needle-like (α+β) eutectics, and for the hypereutectic Cu-1.7%Cr and Cu-5.6%Cr alloys,α(Cu) phase, primary β(Cr) phase and (α+β) eutectics coexist. With the increase of the solidification rate, the morphology evolution of every phase is that, 1st cellular(dendrite) of α(Cu) phase thins and cellular(dendrite) spacing shortens gradually, (α+β) eutectics set in α(Cu) cellular or dendrite, and primary β(Cr) phase distributes unevenly on α(Cu) matrix, whose morphology undergoes the change from dendrite to particle
