Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 503, Issue 1-2, Pages 32-36Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2008.03.055
Keywords
Severe plastic deformation; High-pressure torsion; Pure Al; Hardness; Electron backscatter diffraction analysis; Transmission electron microscopy
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Pure Al (99.99%) was processed using high-pressure torsion (HPT), and Vickers microhardness was measured along the diameter of the disk samples. When all hardness values were plotted as a function of equivalent strain, they fell on a single line having three distinctive regions. The hardness increases with the strain in the first region and, after taking a maximum at an equivalent strain of similar to 2, the hardness decreases with further straining in the second region. The third region appears at an equivalent strain of similar to 6 or higher as a steady state where the hardness remains unchanged. Electron backscatter diffraction analysis and transmission electron microscopy were conducted in the corresponding regions and microstructural evolution with straining was examined. Grain refining mechanism using HPT was discussed based on the change in the hardness and microstructures. (C) 2008 Published by Elsevier B.V.
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