Abstract
Ambient-temperature mechanical properties of isochronally aged 1420-Sc-Zr aluminum alloy were investigated. A significant grain refinement is caused with the additions of Sc and Zr. No primary Al3Sc or Al3Zr is found in as-cast 1420-Sc-Zr alloy. However, primary Al3(Sc,Zr) particles exist in as-cast 1420-Sc-Zr alloy. During the isochronal aging process, these particles of Al3Li, Al3Sc and Al3Zr begin to precipitate at 100 °C, 250 °C and 450 °C, respectively. These precipitation particles make 1420-Sc-Zr alloy obtain three peak microhardness: 845 MPa at 150 °C, 1000 MPa at 350 °C, and 985 MPa at 500 °C. The predicted strengthening increments are contrasted to the measured strengthening increment to confirm the operative precipitation mechanism at different isochronal aging. The shearing mechanism is operating in 1420 and 1420-Sc-Zr alloys aged isochronally to 150 °C. A mixed mechanism (the shearing and bypass mechanisms) is predicted to be operative in 1420-Sc-Zr alloy aged isochronally to 350 °C. The Orowan strenthening mechanism is operative in 1420-Sc-Zr alloy aged isochronally to 500 °C. During isothermal aging at 475 °C after aged isochronally to 450 °C, 1420-Sc-Zr alloy exhibits excellent thermal stability.
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