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Microstructures and the Mechanical Properties of the Al–Li–Cu Alloy Strengthened by the Combined Use of Accumulative Roll Bonding and Aging
Author(s) -
Tang Yongpeng,
Hirosawa Shoichi,
Saikawa Seiji,
Matsuda Kenji,
Lee Seungwon,
Horita Zenji,
Terada Daisuke
Publication year - 2020
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201900561
Subject(s) - materials science , microstructure , ultimate tensile strength , hardenability , spinodal decomposition , vickers hardness test , accumulative roll bonding , alloy , ductility (earth science) , tensile testing , metallurgy , hardening (computing) , composite material , elongation , precipitation hardening , phase (matter) , creep , chemistry , organic chemistry , layer (electronics)
Herein, the age‐hardening behavior of the severely deformed and then artificially aged A2099 Al–Li–Cu alloy is investigated by Vickers hardness test, tensile test, and transmission electron microscopy (TEM). The combined processes of accumulative roll bonding (ARB) and aging treatment at 373 K for 2419 ks result in the highest hardness (≈190 HV) for the 5‐cycled ARB sample with an age hardenability of 37 ± 2 HV. For the 2‐cycled ARB sample with aging treatment, the ultimate tensile strength and elongation to failure reach 553 MPa and 7%, which are greater than those of the ARB sample without aging treatment (i.e., 442 MPa and 1%). The corresponding TEM microstructures suggest that the refined δ′ –Al 3 Li particles formed by spinodal decomposition are responsible not only for higher hardness and strength but also for the optimized strength–ductility balance. Therefore, our proposed strategy, i.e., “take advantage of spinodal decomposition,” is regarded as a convincing approach to induce nanosized precipitates within ultrafine grains for optimizing the strength–ductility balance.