Formation of nano-sized Ti 68Fe 26Si 6 icosahedral quasicrystalline phase by rapid quenching and mechanical alloying

Abstract

Investigation using rapid quenching (RQ) and mechanical alloying (MA) were conducted to produce Ti 68Fe 26Si 6 icosahedral quasicrystals. Subsequent heat treatment was performed on both rapidly quenched ribbons and mechanically alloyed powders in a vacuum furnace under various heat treatment conditions of temperature ranging from 440 to 900°C with a constant heating rate of 10°C/min and holding time up to 30 h. The amorphous phase of Ti 68Fe 26Si 6 ribbon was successively achieved by RQ for the first time from the present investigation. During the heat treatment, the icosahedral quasicrystalline phase was transformed from the melt-spun amorphous ribbon at the glass transition temperature of 430°C and remained up to approximately 520°C. The quasicrystalline phase, however, was somewhat difficult to be obtained from heat treatment of the Ti 68Fe 26Si 6 powder milled for 5 h under the present experimental conditions.