Microstructures of titanium-aluminides produced by laser surface alloying |
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Authors: | J H Abboud D R F West |
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Affiliation: | (1) Department of Materials, Imperial College of Science, Technology, and Medicine, Exhibition Road, SW7 2BP London, UK |
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Abstract: | The microstructures of Ti-Al layers (from 43–80 at %Al) produced by laser surface alloying of titanium substrate with a powder feed technique have been investigated. The laser processing parameters were; 1.8 kW laser power, 3 mm beam diameter, 7 mm s–1 traverse speed, and values of powder flow rates of aluminium ranging from 0.07–0.11 g s–1. The microstructures were dendrites of 2 and interdendritic regions of 2+ in the Ti-43 at %Al alloy; dendrites of either 2 or 2+ with interdendritic in the Ti-50 at %Al alloy; dendrites of 2+ with interdendritic in the Ti-55 at %Al alloy; single phase in the Ti-60 at %Al alloy and TiAl3 dendrites and Al solid solution in the interdendritic regions in the Ti-80 at %Al alloy. The microstructures were fine and comparable to those produced by other methods of rapid solidification processing. The microstructures of the Ti-50 and Ti-55 at %Al alloys were in agreement with the existence of the peritectic reactions:L + andL + ![rarr](/content/p327x1007q241t18/xxlarge8594.gif) , in the Ti-Al system. |
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