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Mechano-Thermal Treatment of TiO_2-Al Powder Mixture to Prepare TiAl/Al_2O_3 Composite
Somaye Alamolhoda,Saeed Heshmati-Manesh,Abolghasem Ataie 대한금속·재료학회 2011 METALS AND MATERIALS International Vol.17 No.5
In this research, a composite comprising an intermetallic matrix and dispersed Al_2O_3 particles was processed. A mixture of TiO_2 and Al was mechanically activated in the presence of a process control agent and/or without it, in a high-energy planetary ball mill. As a subsequent process, the sample was sintered at various temperatures. The phase composition and morphology of the samples were evaluated by XRD and SEM techniques, respectively. The thermal behavior of the samples milled for 8 h with PVA and/or without it, were also assessed by the DTA technique and compared with one another. The DTA results revealed that addition of PVA shifted the aluminothermic reduction of TiO_2 to higher temperatures; therefore, final composite phases were developed at higher temperatures. The results also showed that addition of PVA during milling caused the final microstructure to coarsen. The XRD pattern of the sample sintered at 700 °C exhibits the existence of TiAl, Ti_3Al, and Al_2O_3 phases. In the sample sintered at 850 °C, the remaining Ti_3Al peak was attenuated and completely disappeared at 1000 °C.