Mechanical Properties of Bulk Ultrafine Grained Aluminum Fabricated by Torsion Deformation at Various Temperatures and Strain Rates

Title
Mechanical Properties of Bulk Ultrafine Grained Aluminum Fabricated by Torsion Deformation at Various Temperatures and Strain Rates
Author(s)
Sunisa Khamsuk[Sunisa Khamsuk]박노근Si Gao[Si Gao]Daisuke Terada[Daisuke Terada]Hiroki Adachi[Hiroki Adachi]Nobuhiro Tsuji[Nobuhiro Tsuji]
Keywords
NANOCRYSTALLINE MATERIALS; STRENGTH; MICROSTRUCTURE; STRESS
Issue Date
201401
Publisher
JAPAN INST METALS
Citation
MATERIALS TRANSACTIONS, v.55, no.1, pp.106 - 113
Abstract
A commercial purity aluminum was heavily deformed up to an equivalent strain of 4 at various temperatures and strain rates by torsion deformation to produce specimens with various ultrafine grained (UFG) microstructures. The microstructures were characterized by electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). The microstructural observation revealed that the torsion deformed specimens had various mean grain sizes ranging from 0.38 to 8.6 mu m. The grain size and dislocation density in the microstructures depended on the deformation conditions organized by Zener-Hollomon parameter. The mechanical properties of the torsion deformed specimens were investigated by tensile test at room temperature. It was found that the ultrafine grained specimens showed high strength which reached a value almost three times higher than that of the starting material. The strength of the UFG aluminum was higher than the level expected from the Hall-Petch relationship for conventionally coarse grained aluminum. The strengthening mechanisms in the UFG aluminum were discussed in terms of substructures introduced during torsion deformation.
URI
http://hdl.handle.net/YU.REPOSITORY/33470http://dx.doi.org/10.2320/matertrans.MA201321
ISSN
1345-9678
Appears in Collections:
공과대학 > 신소재공학부 > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE