|About this Abstract
||2019 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||Determination of the Intermetallic α-Phase Crystal Structure in Aluminum Alloys Solidified at Rapid Cooling Rates
||Joseph Jankowski, Michael Kaufman, Amy Clarke, Krish Krishnamurthy, Paul Wilson
|On-Site Speaker (Planned)
The intermetallic α-phase (Pm-3 and Im-3 symmetry, a=12.5-12.6 angstroms) is known to form in conventional castings of aluminum when Fe, Mn and Si are present as well as in rapidly solidified Al-Fe-V-Si and Al-Fe-Cr-Si alloys. The crystal structure of the α-phase has long been assumed to be the same in both conventional castings and rapidly solidified alloys, but this has not yet been definitely proven due to challenges in producing viable samples of the α-phase from rapidly solidified alloys. Samples of the α-phase in the Al-Fe-V-Si and Al-Fe-Cr-Si quaternary systems have been produced and the crystal structures of these intermetallics were compared to the well-characterized Al-Fe-Mn-Si quaternary and Al-Mn-Si ternary systems using synchrotron powder diffraction. Electron probe microanalysis to determine the α-phase intermetallic compositions will also be presented.
||Planned: Light Metals