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Review: Overcoming the paradox of strength and ductility in ultrafine-grained materials at low temperatures

Title
Review: Overcoming the paradox of strength and ductility in ultrafine-grained materials at low temperatures
Author
Kawasaki, Megumi
Keywords
SEVERE PLASTIC-DEFORMATION; ATOMIC-FORCE MICROSCOPY; HIGH-PRESSURE TORSION; BULK NANOSTRUCTURED MATERIALS; ZN-22-PERCENT AL-ALLOY; TENSILE DEFORMATION; MECHANICAL-PROPERTIES; BOUNDARY DIFFUSION; ALUMINUM-ALLOY; METALS
Issue Date
2016-01
Publisher
SPRINGER
Citation
JOURNAL OF MATERIALS SCIENCE, v. 51, NO 1, Page. 7-18
Abstract
Ultrafine-grained (UFG) materials with grain sizes in the submicrometer or nanometer range may be prepared through the application of severe plastic deformation (SPD) to bulk coarse-grained solids. These materials generally exhibit high strength but only very limited ductility in low-temperature testing, thereby giving rise to the so-called paradox of strength and ductility. This paradox is examined and a new quantitative diagram is presented which permits the easy insertion of experimental data. It is shown that relatively simple procedures are available for achieving both high strength and high ductility in UFG materials including processing the material to a very high strain and/or applying a very short-term anneal immediately after the SPD processing. Significant evidence is now available demonstrating the occurrence of grain boundary sliding in these materials at low temperatures, where this is attributed to the presence of non-equilibrium grain boundaries and the occurrence of enhanced diffusion along these boundaries.
URI
https://link.springer.com/article/10.1007%2Fs10853-015-9143-5http://hdl.handle.net/20.500.11754/31709
ISSN
0022-2461; 1573-4803
DOI
10.1007/s10853-015-9143-5
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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