Abstract
The ternary system Al-Fe-Ge was investigated for a partial isothermal section at 400 °C, evaluating the all-solid phase equilibria in the Al-rich corner of the system for the first time. Investigations with SEM/EDX were combined with extensive XRD studies using powder- as well as single-crystal techniques. Four new compounds labelled τ5 to τ8 were identified and characterized. Complex phase equilibria in the partial section with Fe< 50 at% include all ternary phases from τ1 to τ8 with the exception of τ2 which is replaced by the low-temperature phase τ5 at 400 °C. The τ5 phase (Al1−xFeGe1+x) was found to crystallize in a ternary variant of the La2Sb-type (I4/mmm) and was characterized by Rietveld refinements. The compound τ7 (Al4.5−xFeGe1+x) is related to the β-phase in the Al-Fe-Si system (Al4.5FeSi). Its crystal structure was determined by single-crystal XRD in space group Cmce. The crystal structures of τ6 and τ8 were not determined up to now, but their stability with respect to decomposition into neighbouring phases was confirmed by additional liquid-solid diffusion couple experiments at 470 °C.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.