Mechanical Properties of Bulk Amorphous Ti50Cu20Ni20Al10 Fabricated by High-energy Ball Milling and Spark-plasma Sintering
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Ti50Cu20Ni20Al10 quaternary amorphous alloy was prepared by high-energy ball milling process. A complete amorphization was confirmed for the composition of Ti50Cu20Ni20Al10 after milling for 30hrs. Differential scanning calorimetry showed a large super-cooled liquid region (ΔTx = Tx Tg, Tg and Tx: glass transition and crystallization onset temperatures, respectively) of 80 K. Prepared amorphous powders of Ti50Cu20Ni20Al10 were consolidated by spark-plasma sintering. Densification behavior and microstructure changes were investigated. Samples sintered at higher temperature of 713 K had a nearly full density. With increasing the sintering temperature, the compressive strength increased to fracture strength of 756 MPa in the case of sintering at 733 K, which showed a ‘transparticle’ fracture. The samples sintered at above 693 K showed the elongation maximum above 2%.
Abstract
Ti50Cu20Ni20Al10 quaternary amorphous alloy was prepared by high-energy ball milling process. A complete amorphization was confirmed for the composition of Ti50Cu20Ni20Al10 after milling for 30hrs. Differential scanning calorimetry showed a large super-cooled liquid region (ΔTx = Tx Tg, Tg and Tx: glass transition and crystallization onset temperatures, respectively) of 80 K. Prepared amorphous powders of Ti50Cu20Ni20Al10 were consolidated by spark-plasma sintering. Densification behavior and microstructure changes were investigated. Samples sintered at higher temperature of 713 K had a nearly full density. With increasing the sintering temperature, the compressive strength increased to fracture strength of 756 MPa in the case of sintering at 733 K, which showed a ‘transparticle’ fracture. The samples sintered at above 693 K showed the elongation maximum above 2%.
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