Microstructure of rapidly solidified Cu–25 wt.% Cr alloys
Microstructure of rapidly solidified Cu–25 wt.% Cr alloys
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DOI：
10.1016/j.msea.2005.03.095
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发表时间：
2005-05
期刊：
影响因子：
6.4
通讯作者：
Zhiming Zhou;Yaping Wang;Jianrong Gao;M. Kolbe
中科院分区：
文献类型：
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作者：
Zhiming Zhou;Yaping Wang;Jianrong Gao;M. Kolbe
通过以 4、12 和 36m/s 三种轮速进行熔体旋压来快速凝固 Cu-25wt.% Cr 合金。通过扫描电子显微镜（SEM）研究带材的微观结构。研究发现，带材通常具有由富铬相在富铜基体中精细分散组成的微观结构，并且富铬相的形态和尺寸随轮速的变化而变化。对于较低的轮速，富铬相显示出双重形态：枝晶和球状体。富Cr枝晶均分布在富Cr球体周围，自由表面上的枝晶数量多于轮表面。富铬球体的尺寸分布广泛，自由表面上的平均尺寸比轮表面上的平均尺寸大。在最低轮速的带中，小的富铬球体倾向于聚集在那些大的球体周围，形成球体簇。对于最高的轮速，富铬相显示出一种形态、球状体和减小的尺寸。对快速凝固过程中富铬球体的形成结果进行了讨论。
Rapid solidification of Cu–25wt.% Cr alloys was carried out by melt spinning at three wheel speeds 4, 12 and 36m/s. The microstructure of the ribbons was investigated by scanning electron microscopy (SEM). It was found that the ribbons generally have a microstructure consisting of a fine dispersion of a Cr-rich phase in a Cu-rich matrix, and that the morphology and size of the Cr-rich phase vary with the wheel speed. For lower wheel speeds, the Cr-rich phase shows dual morphologies, dendrites and spheroids. The Cr-rich dendrites are all distributed around the Cr-rich spheroids, and have a larger amount on the free surface than on the wheel surface. The Cr-rich spheroids show a wide distribution of size, and have a larger mean size on the free surface than on the wheel surface. In the ribbons of the lowest wheel speed, small Cr-rich spheroids tend to gather around those big ones forming spheroid clusters. For the highest wheel speed, the Cr-rich phase shows one morphology, spheroids, and a reduced size. The results were discussed with respect to the formation of the Cr-rich spheroids during rapid solidification.