|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Solid State Precipitation
||Analysis of Crystal Structures with Icosahedral Local Order in Al-Fe-V-Si Alloys After Solidification at Intermediate Cooling Rates
||Joseph Jankowski, Michael J. Kaufman, Amy J. Clarke, Stephen Midson, Krish Krishnamurthy
|On-Site Speaker (Planned)
A two-phase powder of the h-AlFeVSi (P6/mmm a=2.522 nm c=1.256 nm) and α-AlFeVSi (Im-3 a=1.251 nm) icosahedral quasicrystalline approximants was prepared from a copper mold chill casting of RS8009 by dissolution of the aluminum matrix. The α-phase is a desirable strengthening phase in RS8009 while the h-phase is present as a coarse intermetallic. The crystal structure of the h-phase was solved from high resolution synchrotron powder diffraction using the charge flipping algorithm Superflip. Differences in local icosahedral order in the two phases will be presented. Additionally, the crystal structure solution from powder diffraction for the h-phase will be briefly compared to the previous model determined from TEM to highlight the advantages of high resolution powder diffraction.
||Planned: Supplemental Proceedings volume