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A critical examination of the paradox of strength and ductility in ultrafine-grained metals

Title
A critical examination of the paradox of strength and ductility in ultrafine-grained metals
Author
Megumi Kawasaki
Keywords
Al–Si alloy; ductility; high-pressure torsion; strength; ultrafine grains
Issue Date
2014-11
Publisher
Cambridge University Press
Citation
Journal of Materials Research, 2014, 29(21), P.2534-2546
Abstract
The paradox of strength and ductility is now well established and denotes the difficulty of simultaneously achieving both high strength and high ductility. This paradox was critically examined using a cast Al-7% Si alloy processed by high-pressure torsion (HPT) for up to 10 turns at a temperature of either 298 or 445 K. This processing reduces the grain size to a minimum of similar to 0.4 mu m and also decreases the average size of the Si particles. The results show that samples processed to high numbers of HPT turns exhibit both high strength and high ductility when tested at relatively low strain rates and the strain rate sensitivity under these conditions is similar to 0.14 which suggests that flow occurs by some limited grain boundary sliding and crystallographic slip. The results are also displayed on the traditional diagram for strength and ductility and they demonstrate the potential for achieving high strength and high ductility by increasing the number of turns in HPT.
URI
https://www.cambridge.org/core/journals/journal-of-materials-research/article/critical-examination-of-the-paradox-of-strength-and-ductility-in-ultrafinegrained-metals/B03B4A66C203AF6353F17F96E98FC8BDhttp://hdl.handle.net/20.500.11754/53220
ISSN
0884-2914; 2044-5326
DOI
10.1557/jmr.2014.272
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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