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• W3158012462 endingPage "160057" @default.
• W3158012462 startingPage "160057" @default.
• W3158012462 abstract "• A process has been developed in the present study to prepare Hf 55 Cu 28 Ni 5 Al 12 bulk metallic glass (BMG) alloy in bulk form. • Planetary ball milling, high energy ball milling and cryo milling were used to prepare BMG powder from melt spun ribbons. • Cryo-milled powders were found to be effective out of these milling methods. • MGs in bulk form with 99.8% density, was prepared using spark plasma sintering (SPS) technique. • Effect of pressure and temperature on the densification of BMG alloy in SPS has been studied in detail. • Hardness of SPS compacts were also studied in detail. The present work describes fabrication of cylindrical cross section bulk specimens of Hf-based bulk metallic glass by spark plasma sintering. Initially amorphous ribbons were made by vacuum melt spinning and different milling techniques such as planetary ball milling, high energy ball milling and cryo-milling were employed for converting ribbons into powders. Planetary ball milling of as spun ribbons did not yield powder. While powders (particle size<500 µm) were successfully obtained following high energy ball milling, partial crystallization of powder particles was also observed. Cryo-milling in select conditions fulfilled both the objectives as it successfully converted ribbons into powder retaining the amorphous phase. Powder produced by cryo-milling was divided into two broad size range (>75 µm and<25 µm) which were used to study the effect of particle size and its distribution on the consolidation behavior of the amorphous powder. The relative densification of spark plasma sintered pellets prepared using powder particles (>75 µm and<25 µm) is around 96–98%, whereas densification as high as 99.8% has been achieved with a blend of>75 µm and<25 µm powders. Complete amorphous phase is formed only when the compaction experiment is performed at 460 °C and 480 °C at 800 MPa. Sintering at higher temperature has resulted in presence of nano crystallites. Hardness values of the compacts containing amorphous phase are relatively lower as compared to those containing the crystallite phase. Present study has demonstrated the potential of spark plasma sintering in consolidation of amorphous powders to near full density cylindrical pellets." @default.
• W3158012462 created "2021-05-10" @default.
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• W3158012462 date "2021-09-01" @default.
• W3158012462 modified "2023-09-29" @default.
• W3158012462 title "Processing of Hf based bulk metallic glass through Spark Plasma Sintering (SPS) process" @default.
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• W3158012462 doi "https://doi.org/10.1016/j.jallcom.2021.160057" @default.
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