| AL-Li-Cu-Mg-Zr alloy powders were manufactured by gas atomizer and then extruded. The microstructures and mechanical properties of alloy powders and extruded bars were studied. The microstructures were typical cellular structure and icosahedral phases were crystallized out on the cell boundaries in Al-3Li-3Cu-1Mg-0.3Zr, Al-3Li-3Cu-1Mg-0.1Zr and Al-4Li-3Cu-1Mg-0.1Zr alloy powders. But increasing Li/Cu ratio, icosahedral phase and T_B, phase were crystallized out simultaneously. In Al-3Li-3Cu-Mg-Zr alloy extruded bars, almost the precipitates were icosahedral phase and Type 1 phase appeared. In Al-3Li-1.5Cu-Mg-Zr alloy extruded bars, the precipitates were almost R phase. In Al-3Li-1Cu-Mg-Zr alloy extruded bars, the precipitates were almost C phase. Therefore, In AI-Li-Cu-Mg-Zr alloy extruded bars, precipitation mode is Icosahedral phase → Type 1 → Type 2 → R → C phase appeared according to increasing Li/Cu ratio. |
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