TY - JOUR
T1 - Influence of severe plastic deformation at cryogenic temperature on grain refinement and softening of pure metals
T2 - Investigation using high-pressure torsion
AU - Edalati, Kaveh
AU - Cubero-Sesin, Jorge M.
AU - Alhamidi, Ali
AU - Mohamed, Intan Fadhlina
AU - Horita, Zenji
N1 - Funding Information:
KE thanks the Japan Society for Promotion of Science for a Grant-in-Aid for Research Activity (No. 25889043 ). AA would like to thank Indonesian Government for a Ph.D. scholarship through the Directorate of Higher Education Program (DGHE). IFM gratefully acknowledges a scholarship supported by SIRIM Berhad Company of the Malaysian Government . This work was supported in part by the Light Metals Educational Foundation of Japan and in part by a Grant-in-Aid for Scientific Research from the MEXT , Japan, in Innovative Areas “Bulk Nanostructured Metals” (No. 22102004 ).
PY - 2014/9/8
Y1 - 2014/9/8
N2 - 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.
AB - 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.
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U2 - 10.1016/j.msea.2014.06.084
DO - 10.1016/j.msea.2014.06.084
M3 - Article
AN - SCOPUS:84904250960
SN - 0921-5093
VL - 613
SP - 103
EP - 110
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
ER -