Preferred orientations of primary Al4Sr dendrites in a rapidly solidified Al–Sr alloy

Preferred crystallographic orientations of primary Al4Sr dendrites in a rapidly solidified Al–23 Sr (wt.%) alloy have been investigated using transmission electron microscopy (TEM). The Al4Sr dendrites with 90° branches are dominant in the Al–23 Sr alloy melt-spun at 500 rpm and the dendrite orientation is the 〈110〉 direction. Wheel speed has a significant effect on the morphology and preferred orientation of the Al4Sr dendrites in the melt-spun Al–23 Sr alloy.