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A coupling of rapid crystallization and plastic consolidation as a method for mass scale production of bulk submicrocrystalline aluminum alloys
Author(s) -
Dybiec Henryk
Publication year - 2010
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200983363
Subject(s) - materials science , consolidation (business) , crystallization , crystallite , economies of agglomeration , porosity , extrusion , aluminium , pressing , raw material , grain boundary , isothermal process , metallurgy , metal powder , composite material , metal , chemical engineering , microstructure , thermodynamics , chemistry , business , accounting , organic chemistry , physics , engineering
Rapid crystallization is a well‐known method for production of ultrafine‐grained metallic materials using the overcooling effect. Unfortunately, this method provides material in dispersed form with very limited dimensions of individual particles, which must be consolidated to bulk form for engineering use. To prevent destabilization of ultrafine‐grain structure of polycrystalline particles the consolidation process should to be quick enough and must be conducted at reasonably low temperatures. Such reasons suggest the process of plastic consolidation. In this process plastic deformation of individual particles develops new surfaces in status nascendi , which is able to create strong bonds between collectively deformed particles of dispersed materials and converts the powder to the bulk form. The plastic consolidation by isothermal extrusion is the agglomeration process of plastically deformable particles without involving diffusion effects. Bulk materials with no measurable porosity are the product of this process, in which the character of interaction among individual particles of powder shows similar character to interaction at grain boundaries in polycrystalline metals.