Abstract
The effect of one pass hot forming cold die quenching (HFQ) in equal channel angular pressing (ECAP) on the evolution of hardness, tensile properties and microstructure of AA2024 aluminum alloy is investigated. Since AA2024 is a heat treatable aluminum alloy, it is sensitive to the cooling process applied before deformation or aging. Therefore, samples are considered in air cooled (AC) and water quenched (WQ) conditions and the results are compared with those obtained in HFQ-ECAP. In addition, hardness and tensile properties are investigated in as-deformed and aged conditions to understand the response of the alloy to aging. It is found that distribution of precipitates, hardness and tensile properties in the aged samples significantly depend on the cooling process prior to deformation. Significant increases in hardness (24 and 22%) and strength are observed when the WQ and HFQ samples are aged after one pass ECAP. However, an effective precipitation hardening is not achieved when AC cooling is applied. In addition, much more effective strengthening and precipitation hardening with respect to AC samples are observed by utilizing HFQ. Maximum hardness (201 Hv), yield strength (YS) (446 MPa) and ultimate tensile strength (UTS) (558 MPa) are achieved in the WQ sample after ECAP and aging treatment. Similar properties are achieved in HFQ-ECAP samples after aging treatment which respectively equal 190 Hv, 446 MPa and 560 MPa for hardness, YS and UTS. Indeed, due to its very similar achieved mechanical properties, the HFQ-ECAP is found as an effective way to replace WQ-ECAP of AA2024 alloy.
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