Functionally gradient titanium-aluminide composites produced by laser cladding |
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Authors: | J H Abboud D R F West R D Rawlings |
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Affiliation: | (1) Department of materials, Imperial College of Science, Technology and Medicine, SW7 2BP London, UK |
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Abstract: | The laser surface cladding of Ti-Al/TiB2 composites was investigated as a means of producing a functionally gradient material on a commercially pure Ti substrate. Single and double layers were produced. The processing parameters were: 1.7 kW laser power, 3 mm beam diameter, 3–22 mms–1 traverse speeds, 2.2–6.2 g min–1 powder flow rates. The results showed that functionally gradient Ti-Al/TiB2 systems 2 mm thick, with a progressive increase in the Al content from 0 to 35 wt% Al (50 at % Al) could be produced by vertically overlapping two clad layers using powder mixtures of selected compositions. Microstructural and compositional characterization were performed on single-layer and two-layer clads. Preliminary wear testing carried out on a laser surface Ti-Al/TiB2 single-clad layer and on commercial-purity titanium demonstrated the beneficial effect of laser cladding on the wear resistance. |
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