Abstract
Al-Zr(-V) base alloys with various chemical compositions were rapidly solidified using the splat quenching method, and the alloys were consolidated using hot extrusion. Rapidly solidified Al-Zr-V splats showed pronounced age hardening phenomena after the heat treatment, which appeared to have been caused due to the formation of a metastable L1 2-Al 3(Zr, V) phase. It is noticeable that the discontinuous precipitation could be suppressed by additions of V to the Al-Zr base alloys, and the amount of V should be controlled according to the cooling rate of the molten metal to avoid the primary precipitation of Al 10V. By the continuous precipitation of the metastable L1 2-Al 3(Zr, V) phase, improved thermal stability and stabilized microstructure could be obtained in the extruded Al-5.17 Zr-3.22 V alloy.
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