INFLUENCE OF COPPER CONTENT ON THE MICROSTRUCTURAL EVOLUTION OF TITANIUM INMECHANICAL ALLOYING

Описание: The effect of the copper on the titanium microstructure in mechanical alloying was investigated at 2, 5, 10, 15, 20, 30, 40, and 50 hours of MA. Five powder compositions were prepared to evaluate this effect following the relationship Ti100-xCux (x=100, 80,50,20, and 0 at%). X-ray diffraction (XRD) analysis reveals the formation of a face-centered cubic crystal structure of Ti (fcc-Ti) in all the powder compositions except for 100% copper. With 50% of copper, the formation time of the fcc-Ti phase is reduced from 10 to 2 h compared to 100% of titanium. Moreover, the formation of an amorphous phase is avoided when the copper content is below 50 at%. However, for milling times longer than 30 h, the presence of Cu does not affect the formation of the fcc-Ti phase. Scanning electron microscopy (SEM) image analysis shows that adding copper increases the particle size. With 80 and 50 at% of Cu, the particle size remains between 2.6 and 16.6 μm. Though with 20 at% of Cu, the particle size increases with a minimum of 9.2 μm and a maximum of 25.8 μm. This investigation provides essential information for properly designing TiCu alloys produced by mechanical alloying.
This work was funded by the Millennium Institute on Green Ammonia as an Energy Vector – MIGA (ICN2021_023), supported by the Millennium Scientific Initiative, as well as by FONDECYT Regular Project 1241478 and FONDECYT Postdoctoral Project 3240435 of the primary author, all under the National Agency for Research and Development (ANID).