- Effect of Process-Control Agents on Characteristics of Amorphous Al-Y-Ni-Co Alloy Powder Produced by Mechanical Alloying
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H.V. Nguyen, J.C. Kim, J.S. Kim, Y.J. Kwon, Y.S. Kwon
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J Korean Powder Metall Inst. 2010;17(1):7-12.
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DOI: https://doi.org/10.4150/KPMI.2010.17.1.007
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 Abstract
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- In this work, effect of various process-control agents (PCAs) on the mechanical alloying of amorphous alloy of Al_85Y_8Ni_5Co_2 has been investigated. The dependence of the particle shape, size and crystallization behavior of the amorphous alloy powders on the type of PCAs and their concentrations was investigated by using X-ray diffraction, field-emission scanning electron microscopy and differential scanning calorimetry. It was found that the additive of toluene could affect positively the amorphization and thermally induced crystallization processes, as well as the size refinement, morphology and particle-size distribution of as-milled powders in comparison with alloy obtained without PCA.
- Mechanical Properties of Bulk Amorphous Ti50Cu20Ni20Al10 Fabricated by High-energy Ball Milling and Spark-plasma Sintering
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H.V. Nguyen, J.C. Kim, J.S. Kim, Y.J. Kwon, Y.S. Kwon
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J Korean Powder Metall Inst. 2009;16(5):358-362.
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DOI: https://doi.org/10.4150/KPMI.2009.16.5.358
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Abstract
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- Ti_50Cu_20Ni_20Al_10 quaternary amorphous alloy was prepared by high-energy ball milling process. A complete amorphization was confirmed for the composition of Ti_50Cu_20Ni_20Al_10 after milling for 30hrs. Differential scanning calorimetry showed a large super-cooled liquid region (DeltaT_x = T_x T_g, T_g and T_x: glass transition and crystallization onset temperatures, respectively) of 80 K. Prepared amorphous powders of Ti_50Cu_20Ni_20Al_10 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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