Al-Ce nano extrusion outperforms usual high temp Al alloy

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Tensile yield strength of Al-Ce-Mg Nano Extrusion compared to 2618-T6, the commercial high temperature Al alloy of choice
Tensile yield strength of Al-Ce-Mg Nano Extrusion compared to 2618-T6, the commercial high temperature Al alloy of choice

CMI researchers at Oak Ridge National Laboratory and Idaho National Laboratory conducted the activity for this highlight

Innovation
Compactions of Al-Ce-Mg powders dramatically outperform 2618-T6 at high temperature.

Achievement

  • Al-Ce alloys formed by rapid solidification exhibit nanostructure and improved properties. Compacting nanostructured Al-Ce powder by extrusion results in a material with high temperature properties far superior to Al alloy 2618-T6.
  • Alloy strengthens with coarsening-resistant nano-dispersoids, unlike conventional alloys that strengthen with heat treatment.

Significance and Impact
Al alloy 2618-T6 is commercial Al alloy of choice for high temperature applications. Al-Ce significantly outperforming 2618-T6 at high temperature is an important milestone and will incentivize industrial interest. The next step is scale up and room temp strength improvement by process iteration.

Hub Target Addressed

  • Develop substitutes for Al-Li alloys
  • Diversify supply of REE by increasing demand for Ce in a high value product