Abstract
Ti50Fe22Ni22Sn6 amorphous alloy is prepared by mechanical alloying and spark plasma sintering. The milling is performed in a high-energy planetary ball mill. XRD shows that after milled 70h, fully amorphous powders can be obtained, under the condition of the milling speed, 300rpm, and the weighs ratio of ball to powder, 10:1. Thermal stability of the as-milled amorphous powder is determined by DSC at the heating rate of 40K/min. The glass transition Tg and the initial crystallization temperature Tx1 is 625K and 770K, respectively. The amorphous alloy powder is compacted by spark plasma sintering at the temperature of 633K, 653K, 673K, 688K and 723K under the compress of 400Mpa. From XRD, it can be seen that near the glass transition temperature, the samples sintered remain completely amorphous, and when the sintering temperature increasing, although not higher than the initial crystallization temperature, the sintered samples have begun to appear crystalline phases.
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