TY - JOUR
T1 - Age-hardening of an Al-Li-Cu-Mg alloy (2091) processed by high-pressure torsion
AU - Lee, Seungwon
AU - Horita, Zenji
AU - Hirosawa, Shoichi
AU - Matsuda, Kenji
N1 - Funding Information:
We thank Prof. Kenji Higashida of Kyushu University for permitting the use of the bending test facility and Dr. Masaki Tanaka of Kyushu University for helpful assistance in using the bending test machine. One of the authors (SL) would like to thank the AQ program for a PhD scholarship. This research 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 , in part by a Grant-in-Aid for Scientific Research from the MEXT, Japan , in innovative Areas “Bulk Nanostructured Metals” and in part by Kyushu University Interdisciplinary Programs in Education and Projects in Research Development (P&P).
PY - 2012/6/1
Y1 - 2012/6/1
N2 - This research presents the successful strengthening of an Al-Li-Cu-Mg alloy (2091) through the simultaneous use of grain refinement and age hardening. Following solid-solution treatment, the alloy was processed by high-pressure torsion (HPT) at room temperature and the grain size was refined to ∼140. nm. The Vickers microhardness increased with increasing strain, and saturated to a constant level of 225. Hv. A further increase in the hardness to ∼275. Hv was achieved by aging the HPT-processed alloy at 100 °C and 150 °C. Bending tests for the samples treated using the peak aging conditions demonstrated that the stress was significantly increased while considerable ductility was retained. Transmission electron microscopy revealed that the small grains are well retained even after prolonged aging, and the precipitation of fine δ' particles occurred within the small grains, which confirms that simultaneous strengthening from grain refinement and age hardening is feasible in this alloy.
AB - This research presents the successful strengthening of an Al-Li-Cu-Mg alloy (2091) through the simultaneous use of grain refinement and age hardening. Following solid-solution treatment, the alloy was processed by high-pressure torsion (HPT) at room temperature and the grain size was refined to ∼140. nm. The Vickers microhardness increased with increasing strain, and saturated to a constant level of 225. Hv. A further increase in the hardness to ∼275. Hv was achieved by aging the HPT-processed alloy at 100 °C and 150 °C. Bending tests for the samples treated using the peak aging conditions demonstrated that the stress was significantly increased while considerable ductility was retained. Transmission electron microscopy revealed that the small grains are well retained even after prolonged aging, and the precipitation of fine δ' particles occurred within the small grains, which confirms that simultaneous strengthening from grain refinement and age hardening is feasible in this alloy.
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U2 - 10.1016/j.msea.2012.03.029
DO - 10.1016/j.msea.2012.03.029
M3 - Article
AN - SCOPUS:84860201344
SN - 0921-5093
VL - 546
SP - 82
EP - 89
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
ER -