Microstructure Formation and Tailoring of the Intermetallic TiAl Alloy Produced by Direct Laser Deposition

Abstract

This study investigates the microstructure morphology in a single-track wall of Ti-47Al-2Cr-2Nb alloy produced by direct laser deposition. The as-deposited wall mainly exhibited an alternative-band microstructure containing a dendrite band and α2/γ lamellar band, which is considered to result from the influence of the heat affected zone. A tailoring method was proposed and alternative-band microstructures with various equiaxed colony fractions, and even nearly fully equiaxed colony microstructures, were successfully obtained.

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Funding

This work was supported by the National Natural Science Foundation of China (Grant No. 51971145 and No. 51801126) and the National Key Research and Development Program of China (Grant No. SQ2018YFB200007).

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Correspondence to Chuanwei Li or Jianfeng Gu.

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Manuscript submitted 5 August, 2019.

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Zhang, X., Li, C., Zhong, H. et al. Microstructure Formation and Tailoring of the Intermetallic TiAl Alloy Produced by Direct Laser Deposition. Metall Mater Trans A 51, 82–87 (2020). https://doi.org/10.1007/s11661-019-05552-y

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