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 - Funding Information:
One of the authors (IFM) gratefully acknowledges SIRIM Berhad , Malaysia for a scholarship. KE thanks the Japan Society for the Promotion of Science (JSPS) for a Grant‐in‐Aid for Research Activity (JSPS) for a Grant-in-Aid for Research Activity (No. 25889043 ). This work was supported in part by Japan Science and Technology Agency (JST) under Collaborative Research Based on Industrial Demand “Heterogeneous Structure Control: Towards Innovative Development of Metallic Structural Materials”, 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 ).
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.
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U2 - 10.1016/j.msea.2014.12.117
DO - 10.1016/j.msea.2014.12.117
M3 - Article
AN - SCOPUS:84921290020
SN - 0921-5093
VL - 627
SP - 111
EP - 118
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
ER -