|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Ultrafine-grained Materials X
||Achieving Ultra-high Strengthening of A2024 Alloy through Combination of High-pressure Torsion and Subsequent Aging Treatment
||Takahiro Masuda, Xavier Sauvage, Zenji Horita
|On-Site Speaker (Planned)
It is widely known that additional strengthening is feasible for aluminium alloy by reducing the grain size to submicron level. The method of high-pressure torsion (HPT) was applied for grain refinement to a commercial A2024 (Al-Cu-Mg) alloy. Disk samples with 10mm diameter were processed by HPT under a pressure of 6 GPa for 10 turns, reducing the average grain size to 130 nm. Tensile tests showed that the ultimate tensile strength (UTS) reached 910 MPa with a total elongation of 6.0% immediately after 10 turns. It is noteworthy that extremely high strengthening was successfully achieved by further conducting the subsequent aging treatment, leading to the UTS of 1 GPa due to fine precipitation within the ultrafine grains. According to TEM analysis, the ultra-fine grained structure was retained after aging treatment. Atom probe tomography revealed that both Cu and Mg are segregated on the grain boundary even before aging treatment.
||Planned: Supplemental Proceedings volume