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Microstructure Formation and Tailoring of the Intermetallic TiAl Alloy Produced by Direct Laser Deposition
XINYU ZHANG, CHUANWEI LI, HAOZHANG ZHONG, XUDONG YANG, and JIANFENG GU
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 a2/c 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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