Process Optimization of Melt Growth Alumina/Aluminum Titanate Composites Directed Energy Deposition: Effects of Scanning Speed

•Alumina/aluminum titanate composites were prepared using directed laser deposition.•Scanning speed has a significant effect on the microstructure and macro features.•Microstructure and macro defects are responsible for the trend of properties.•Optimal forming quality was achieved at the medium-speed scanning process window.