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Influence of high-pressure torsion and hot rolling on the microstructure and mechanical properties of aluminum-fullerene composites

Title
Influence of high-pressure torsion and hot rolling on the microstructure and mechanical properties of aluminum-fullerene composites
Authors
Roh, AeranUm, Ho YongKim, DaeyoungNam, SeungjinKim, Hyoung SeopChoi, Hyunjoo
POSTECH Authors
Kim, Hyoung Seop
Date Issued
Oct-2017
Publisher
SPRINGER
Abstract
In this study, we investigate the impacts of working process, high-pressure torsion (HPT) and hot rolling (HR) on the microstructure and mechanical performance of aluminum-based nanocomposites containing fullerenes. HPT caused severe plastic deformations that generate numerous dislocations and lattice strains, and this stimulated the formation of aluminum carbides (Al4C3) and reduced the hardness during heat treatment. In contrast, the HRed specimens experienced dynamic recovery, and their initial dislocation densities and lattice strains were lower than those of the HPTed specimens. Thus, the HRed composites formed supersaturated aluminum phases as well as aluminum carbides during the heat treatment. The supersaturated phases provided high-density dislocations and severe lattice strains, resulting in an increase in the hardness during the heat treatment. This comparison suggests that the mechanical properties of aluminum-fullerene composites can be controlled by working processes in practical situations.
Keywords
CARBON NANOTUBE COMPOSITES; METAL-MATRIX COMPOSITES; NANOCRYSTALLINE ALUMINUM; INTERFACIAL REACTIONS; NETWORK STRUCTURES; POWDER-METALLURGY; GRAIN-REFINEMENT; GRAPHENE OXIDE; NANOCOMPOSITES; TEMPERATURE
URI
http://oasis.postech.ac.kr/handle/2014.oak/50428
DOI
10.1007/s10853-017-1230-3
ISSN
0022-2461
Article Type
Article
Citation
JOURNAL OF MATERIALS SCIENCE, vol. 52, no. 20, page. 11988 - 12000, 2017-10
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 KIM, HYOUNG SEOP
Dept of Materials Science & Enginrg
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