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Different models of hardness evolution in ultrafine-grained materials processed by high-pressure torsion

Title
Different models of hardness evolution in ultrafine-grained materials processed by high-pressure torsion
Author
Megumi Kawasaki
Keywords
Equivalent Strain; Commercial Purity; Hardness Distribution; Homologous Temperature; Hardness Model
Issue Date
2014-01
Publisher
Elsevier Editora Ltda.
Citation
Journal of Materials Research and Technology, 3, 4,311-318
Abstract
The processing of metals through the application of high-pressure torsion (HPT) provides the potential for achieving exceptional grain refinement in bulk metals. Numerous reports are now available demonstrating the application of HPT to a range of pure metals and simple alloys. In practice, excellent grain refinement is achieved using this processing technique with the average grain size often reduced to the true nano-scale range. Contrary to the significant grain refinement achieved in metals during HPT, the models of the hardness evolution are very different depending upon the material properties. For a better understanding of the material characteristics after conventional HPT processing, this report demonstrates the hardness evolutions in simple metals including high-purity Al, commercial purity aluminum Al-1050, ZK60A magnesium alloy and Zn-22% Al eutectoid alloy after processing by HPT. Separate models of hardness evolution are described with increasing equivalent strain by HPT. Moreover, a new approach for the use of HPT is demonstrated by synthesizing an Al?Mg metal system by processing two separate commercial metals of Al-1050 and ZK60A through conventional HPT processing at room temperature.
URI
https://link.springer.com/article/10.1007/s10853-013-7687-9http://hdl.handle.net/20.500.11754/47733
ISSN
0022-2461; 1573-4803
DOI
10.1016/j.jmrt.2014.06.002
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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