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Proceedings Paper

Laser-surface alloying of a titanium aluminide alloy for Al2O3/TiAl wear-resistant composite coatings
Author(s): Hua Ming Wang; X. X. Li; L. G. Yu
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Paper Abstract

Laser surface alloying using nickel-class Al2O3 powder pre-coatings is employed to improve the wear resistance of a (gamma) -TiAl intermetallic alloy Ti-48Al- 2Cr-2Nb. An `in-situ' wear resistant (gamma) -TiAl matrix composite coating reinforced by rapidly solidified Al2O3 particles is fabricated on substrate of the (gamma) -TiAl intermetallic alloy. The distribution of the Al2O3 reinforcing phase throughout the laser surface alloyed Al2O3/TiAl composite coating is uniform except in the transition zone to the substrate where the coating's microstructure exhibits strong gradient characteristics. The bonding of laser surface alloyed coating to the substrate is of high quality metallurgical. Cracking of the laser surface alloyed coatings can be completely eliminated by preheating and post treatment slow- cooling. Both hardness and wear resistance of the (gamma) - TiAl intermetallic alloy are significantly enhanced after laser surface alloying treatment.

Paper Details

Date Published: 8 September 1999
PDF: 5 pages
Proc. SPIE 3862, 1999 International Conference on Industrial Lasers, (8 September 1999); doi: 10.1117/12.361111
Show Author Affiliations
Hua Ming Wang, Beijing Univ. of Aeronautics and Astronautics (China)
X. X. Li, Beijing Univ. of Aeronautics and Astronautics (China)
L. G. Yu, Beijing Univ. of Aeronautics and Astronautics (China)

Published in SPIE Proceedings Vol. 3862:
1999 International Conference on Industrial Lasers
Fuxi Gan; Horst Weber; Zaiguang Li; Qingming Chen, Editor(s)

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