Rev.Adv.Mater.Sci. (RAMS)
No 4, Vol. 18, 2008, pages 339-343

EFFECT OF Cu ON THE SINTERING ABILITY OF A SURFACE MODIFIED TI5SI3-BASED
ALLOY SYNTHESIZED BY MECHANICAL ALLOYING

Marco Caetano, F.J. Oliveira, R.F. Silva, F. Siõmes and B. Trindade

Abstract

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 úC. After 1300 úC 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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