Growth of dendrites in a rapidly solidified Al-23 Sr alloy

摘要

The microstructure of the melt-spun Al-23 wt/100 Sr alloy has been investigated using X-ray diffraction (XRD) and transmission electron microscopy (TEM). The phases present in the melt-spun Al-23 Sr alloy are identified to be α-Al and Al_4Sr, identical to those in the ingot-cast alloy. Rapid solidification has a marked effect on the morphology of the primary Al4Sr phase and the preferred orientations of its dendrites in the Al-23 Sr alloy. The primary Al_4Sr phase in the melt-spun Al-23 Sr alloy is dendritic, quite different from the coarse slab-like Al4Sr in the ingot-cast alloy.