Effect of Cu on the sintering ability of a surface modified Ti5Si3-based alloy synthesized by mechanical alloying


A (Ti,Mg)(5)Si-3 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)(5)Si-3 phase formed through milling decomposed into Ti5Si3 + Mg2Si during sintering at 900 degrees C. After 1300 degrees C 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 degrees C. Cu acted as an activating sintering element for reaching densification.


Science & Technology - Other Topics; Materials Science


Caetano, M; Oliveira, FJ; Silva, RF; Simoes, F; Trindade, B

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