| A (Ti,Mg)5Si3 alloy was synthesized by mechanical alloying from TiH1.924, Mg and Si powders. After milling, the surface of a portion of the powder was chemically modified by the deposition of a Cu thin layer by d.c. magnetron sputtering. Coated and uncoated samples were consolidated by cold isostatic pressing and sintered at different temperatures. The (Ti,Mg)5Si3 phase formed through milling decomposed into Ti5Si3 + Mg2Si during sintering at 900 œC. After 1300 œC sintering, the coated and uncoated samples were formed mainly by a Ti5Si3 intermetallic phase. MgO fine precipitates were also detected in the microstructure of the samples sintered at 1300 °C. Cu acted as an activating sintering element for reaching densification. |
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