Abstract
In the present work, Ti fibre reinforced Al matrix composites (Tif/Al) were fabricated by pressure infiltration method. In order to suppress the severe Ti–Al reaction and reduce the formation of brittle TiAl3 phase, a TiN layer was coated on Ti fibres by an arc ion plating method before composite preparation. A thin TiN layer was coated on the Ti fibre surface, and the maximum and minimum thickness values of layer were about 3.5 and 1μm, respectively. Prefer orientation of TiN on (111) and (200) was found by XRD analysis. A thin and uniform TiAl3 layer was observed in Tif/Al composite. However, after coated with TiN layer, no significant reaction layer was found in (Tif+TiN)/Al composite. Segregation of Mg element was found in Tif/Al composite, and the presence of TiN layer showed little effect on this behaviour. Due to the large CTE difference between Ti fibre and Al matrix, high density dislocations were observed in the Al matrix. Meanwhile, fine dispersed Mg2Al3 phases were also found in Al matrix. Ti fibre is mainly composed of α- and β-Ti. Small discontinuous needle-like TiAl3 phases were detected at TiN/Al interface, which implies that the presence of TiN layer between the Ti fibre and Al matrix could effectively hinder the formation of TiAl3 phases.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
