Hot Consolidation of Partially Amorphous Cu-Ti Based Alloy: a Comparison Between Hot Extrusion and Hot Compaction by Sintering

Consolidation of amorphous powders, which take advantage of the supercooled liquid region, is an alternative way to overcome the size limitation in marginal metallic glasses. Cu sub(36) Ti sub(34) Zr sub(22) Ni sub(8) based amorphous powders were obtained during high energy ball-milling. The analyse...

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Published in:Materials research (São Carlos, São Paulo, Brazil) São Paulo, Brazil), 2015-06, Vol.18 (3), p.448-452
Main Authors: Medeiros, Bruno Bellini, Kiminani, Cláudio Shyinti, Botta, Walter José, Bolfarini, Claudemiro, Jorge Junior, Alberto Moreira
Format: Article
Language:English
Subjects:
amorphous alloys
Amorphous materials
AMORPHOUS STRUCTURE
Consolidation
COPPER TITANIUM ALLOYS
ENGINEERING, CHEMICAL
EXTRUSION
HARDNESS
HOT EXTRUSION
MATERIALS SCIENCE, MULTIDISCIPLINARY
MECHANICAL PROPERTIES
Metallic glasses
METALLURGY & METALLURGICAL ENGINEERING
nanocomposites
PROPERTIES
Ribbons
SINTERING
Sintering (powder metallurgy)
Tapes (metallic)
Thermal properties
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Summary:Consolidation of amorphous powders, which take advantage of the supercooled liquid region, is an alternative way to overcome the size limitation in marginal metallic glasses. Cu sub(36) Ti sub(34) Zr sub(22) Ni sub(8) based amorphous powders were obtained during high energy ball-milling. The analyses revealed that amorphous structures of powders and ribbons are quite different and this led to a different thermal behavior being the powders more thermally stable than the ribbons. Extrusion was initially proposed as a consolidation process; however, the decrease in viscosity in remainder amorphous matrix was not sufficient for that process, but certainly sufficient for sintering the sample during hot consolidation. An amorphous/nanocrystalline microstructure known for enhancing the mechanical properties of their fully amorphous counterparts was obtained. Evaluation of mechanical properties by microhardness revealed the relatively high hardness of HV 768. From these results, consolidation by sintering seems a promising route to produce bulk metallic glasses nanocomposites.
ISSN:1516-1439
1980-5373
1516-1439
1980-5373
DOI:10.1590/1516-1439.277114