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Evolution of hardness in ultrafine-grained metals processed by high-pressure torsion

Title
Evolution of hardness in ultrafine-grained metals processed by high-pressure torsion
Author
Megumi Kawasaki
Keywords
Hardness; High-pressure torsion; Homogeneity; Severe plastic deformation
Issue Date
2014-12
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&, 3(4), p.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. (C) 2014 Brazilian Metallurgical, Materials and Mining Association. Published by Elsevier Editora Ltda.
URI
https://www.sciencedirect.com/science/article/pii/S2238785414000490?via%3Dihubhttp://hdl.handle.net/20.500.11754/52549
ISSN
2238-7854; 2214-0697
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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