Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 613, Issue -, Pages 103-110Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.06.084
Keywords
Severe plastic deformation (SPD); Liquid nitrogen; Ultrafine-grained (UFG) materials; Self-annealing; Stacking fault energy; Homologous temperature
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Funding
- Japan Society for Promotion of Science [25889043]
- Indonesian Government through the Directorate of Higher Education Program (DGHE)
- SIRIM Berhad Company of the Malaysian Government
- Light Metals Educational Foundation of Japan
- MEXT, Japan [22102004]
- Grants-in-Aid for Scientific Research [22102004, 25889043] Funding Source: KAKEN
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Several metals were severely deformed at cryogenic temperature in liquid nitrogen and at room temperatures in air using high-pressure torsion (HPT). Extra grain refinement to the nanometer level and extra hardening were achieved after cryogenic-HPT in niobium, which has a high melting temperature. In copper, which has a moderate melting temperature, nanograins formed during cryogenic-HPT but self-annealing, i.e., abnormal softening and grain coarsening to the micrometer level, occurred within a few hours after the cryogenic-HPT. In low-melting-temperature metals such as zinc, magnesium and aluminum, cryogenic-HPT led to extra softening and/or formation of coarser grains because of enhanced static recrystallization. The effect of impurities on grain size, hardness-strain behavior and self-annealing was also studied after cryogenic-HPT. (C) 2014 Elsevier B.V. All rights reserved.
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