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Microstructure, Micro‐Hardness, and Corrosion Resistance of Commercial Purity Al Processed by Hollow‐Cone High‐Pressure Torsion
Author(s) -
Guo Jing,
Zhang Xiaorong,
Kong Dan,
Joo SooHyun,
Kim Wooyeol,
Kim Hyoung Seop,
Zhang Xiaohui
Publication year - 2019
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201800905
Subject(s) - materials science , microstructure , metallurgy , corrosion , scanning electron microscope , indentation hardness , grain size , composite material , torsion (gastropod) , electron backscatter diffraction , medicine , surgery
Hollow‐cone high‐purity commercial Al prepared using copper mold suction casting method is annealed at 600 °C, then processed by high‐pressure torsion of 0.25 and 0.5 revolutions to produce ultrafine‐grained materials. Microstructure, micro‐hardness, and corrosion resistance in 3.5% NaCl solution are investigated in this paper. The grain size of the deformed Al after 0.25 and 0.5 revolutions are 1.16 and 0.73 µm, respectively, which are smaller than that of the annealed specimen of 33.46 µm determined using electron backscatter diffraction. The micro‐hardness of the deformed Al is two‐times larger than that of the annealed specimen. In addition, corrosion resistance of the deformed Al is higher than that of the annealed specimen, which is verified by polarization tests and scanning electron microscopy.