Age-hardening of an Al-Li-Cu-Mg alloy (2091) processed by high-pressure torsion

Seungwon Lee, Zenji Horita, Shoichi Hirosawa, Kenji Matsuda

    研究成果: Contribution to journalArticle査読

    44 被引用数 (Scopus)


    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.

    ジャーナルMaterials Science and Engineering A
    出版ステータス出版済み - 6 1 2012

    All Science Journal Classification (ASJC) codes

    • 材料科学(全般)
    • 凝縮系物理学
    • 材料力学
    • 機械工学


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