Fabrication of Ti-Al coatings by mechanical alloying method

SURFACE & COATINGS TECHNOLOGY

卷:201

Article

Romankov, S. ; Sha, W. ; Kaloshkin, S. D. ; Kaevitser, K.

关键词: coating;    mechanical alloying;    titanium alloys;    titanium aluminides;    phase transformation;    microstructure;   

DOI  :  10.1016/j.surfcoat.2006.06.044

来源: Elsevier

【 摘 要 】

By means of the mechanical alloying (MA) method, Al and Ti+Al coatings were deposited on Ti alloy substrates. During the mechano-activation processing, the substrate surface was impacted by a large number of flying balls along with particles of powder. The repeated ball collisions with the substrate resulted in the deposition of powder on its surface. MA technique produced Ti+Al coating with a thickness of 200 pm and Al one with a thickness of 50 gm after 2 h milling at room temperature. The as-synthesized coatings showed structures with high apparent density and free of porosity. The surface morphology of the MA-coatings was very rough. Annealing treatment led to the leveling of this uneven morphology. Annealing at temperatures ranging between 600 degrees C and 1100 degrees C gave different aluminide phases on the samples. In the case of Al coating, Al3Ti and Ti3Al compound were observed upon heating up to 1100 degrees C. In the case of Ti+Al coating, Al3Ti, Al2Ti, TiAl and Ti3Al were formed on the surface. (c) 2006 Elsevier B.V. All rights reserved.

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