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Phase evolution in laser-deposited titanium-chromium alloys

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Abstract

Ti-Cr alloys have been laser deposited from powder feedstock consisting of a blend of elemental powders using the laser-engineered net-shaping (LENS) process. The microstructure of the as-deposited Ti-Cr alloys primarily consists of a metastable bcc matrix of β-Ti(Cr) with precipitates along the grain boundaries. The grain-boundary precipitates have been identified to be of three types, essentially pure hcp Ti, an alloyed hcp phase designated α-Ti(Cr), and the C14 TiCr2 Laves phase. Initial stages of decomposition, visible within the β matrix, suggest a spinodal clustering process resulting in a fine dispersion of second phases. Diffraction studies have revealed the presence of fine precipitates of α within the β matrix. The evidence for the precipitation of the metastable ω phase within the β matrix is not strong. The phase evolution in the LENS-deposited Ti-Cr alloy has been discussed in the context of rapid solidification and the enthalpy of mixing of the elemental powders.

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Authors and Affiliations

  1. Center for the Accelerated Maturation of Materials, Department of Materials Science and Engineering, The Ohio State University, 43210, Columbus, OH

    R. Banerjee (Research Scientist) & H. L. Fraser (Ohio Regents Eminent Scholar and Professor, Director)

  2. Department of Materials Science and Engineering, The Ohio State University, 43210, Columbus, OH

    P. C. Collins (Graduate Fellow) & H. L. Fraser (Ohio Regents Eminent Scholar and Professor, Director)

Authors
  1. R. Banerjee
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  2. P. C. Collins
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  3. H. L. Fraser
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Banerjee, R., Collins, P.C. & Fraser, H.L. Phase evolution in laser-deposited titanium-chromium alloys. Metall Mater Trans A 33, 2129–2138 (2002). https://doi.org/10.1007/s11661-002-0044-2

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  • DOI: https://doi.org/10.1007/s11661-002-0044-2

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