TY - JOUR
T1 - Age hardening and thermal stability of Al-Cu alloy processed by high-pressure torsion
AU - Mohamed, Intan Fadhlina
AU - Yonenaga, Yosuke
AU - Lee, Seungwon
AU - Edalati, Kaveh
AU - Horita, Zenji
N1 - Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/3/1
Y1 - 2015/3/1
N2 - An age-hardenable Al-4. wt% Cu alloy is severely deformed using high-pressure torsion (HPT) to refine the microstructure to an average gain size of ~210. nm. High saturation hardness of 205. Hv and high tensile strength of 820. MPa are achieved after the HPT processing. It is shown that the strength of the HPT-processed alloy is further improved by natural aging at room temperature or by artificial aging at 353. K. A peak hardness followed by softening appears within a few days after natural aging and within a few minutes after aging at 353. K, suggesting the low thermal stability of the alloy. Quantitative evaluation of different strengthening mechanisms shows that the grain boundary hardening through the Hall-Petch relationship and the precipitation hardening through the Orowan relationship are dominant strengthening mechanisms.
AB - An age-hardenable Al-4. wt% Cu alloy is severely deformed using high-pressure torsion (HPT) to refine the microstructure to an average gain size of ~210. nm. High saturation hardness of 205. Hv and high tensile strength of 820. MPa are achieved after the HPT processing. It is shown that the strength of the HPT-processed alloy is further improved by natural aging at room temperature or by artificial aging at 353. K. A peak hardness followed by softening appears within a few days after natural aging and within a few minutes after aging at 353. K, suggesting the low thermal stability of the alloy. Quantitative evaluation of different strengthening mechanisms shows that the grain boundary hardening through the Hall-Petch relationship and the precipitation hardening through the Orowan relationship are dominant strengthening mechanisms.
KW - Aluminum alloys
KW - High-pressure torsion (HPT)
KW - Precipitation hardening
KW - Severe plastic deformation (SPD)
KW - Ultrafine-grained materials (UFG)
UR - http://www.scopus.com/inward/record.url?scp=84921290020&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2014.12.117
DO - 10.1016/j.msea.2014.12.117
M3 - 学術論文
AN - SCOPUS:84921290020
SN - 0921-5093
VL - 627
SP - 111
EP - 118
JO - Materials Science and Engineering A
JF - Materials Science and Engineering A
ER -