|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Pan American Materials Congress: Nanocrystalline and Ultra-fine Grain Materials and Bulk Metallic Glasses
||Ultrafine Grain Structure and Thermal Stability of Al-Fe Alloys Processed by Severe Plastic Deformation
||Amandine Duchaussoy, Xavier Sauvage, Kaveh Edalati, Zenji Horita, Gilles Renou, Alexis Deschamps, Frédéric De Geuser
|On-Site Speaker (Planned)
Al-1%Fe and al-2%Fe alloys with a relatively large volume fraction of metastable Al6Fe intermetallic particles have been cast and then processed by high-pressure torsion (HPT). The severe plastic deformation induced grain refinement and particle fragmentation has been investigated using XRD, SEM, TEM and APT. Our results unambiguously show that Al6Fe particles are progressively fragmented down to the nanometer scale and finally dissolve in the Al matrix forming a Fe super saturated solid solution. After aging at 150°C, the precipitation of new Fe rich nanoparticles leads to a significant hardening combined with a good thermal stability. The limited grain growth (typically about 200 nm after 1h at 250°C) is attributed to grain boundary pinning by Fe rich nanoscaled particles. The best properties were achieved for the highest level of deformation by HPT and the highest Fe content that provide the most concentrated super saturated solid solution.
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