High-strength and ductile ultrafine-grained Al-Y-Ni-Co alloy for high-temperature applications

摘要

Ultrafine-grained Al90.4Y4.4Ni4.3Co0.9 was synthesized by powder metallurgy from partially-amorphous powder precursors. A good combination of mechanical properties was obtained by optimizing size and density of second phases. The resultant alloy shows high specific strength and specific modulus as well as a tensile ductility of similar to 5% at room temperature. Particularly, this alloy exhibits good mechanical stability at elevated temperature, which is superior to most high-temperature aluminum alloys. These results provide evidence for the effectiveness of Al-based metallic glasses as precursors for the development of high-temperature aluminum alloys.

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