Crystal Growth of Al‐Rich Complex Metallic Phases in the System Al–Cr–Fe Using the Czochralski Method

Abstract

Complex metallic phases in the Al-Cr-Fe system are considered to be interesting because of their enhanced resistance against corrosion. Single crystal growth of the Al 4 (Cr,Fe) and Al 13 (Fe,Cr) 4 phases, which is a prerequisite for detailed studies is presented herein for the first time. Along with their binary end members Al 4 Cr and Al 13 Fe 4 growth of cm 3 -size crystals was achieved by using the Czochralski method from Al-rich solutions at temperatures of approximately 1000°C. Special emphasis is put on the refinement of the Al-rich corner of the ternary phase diagram in determining the 1000°C equilibria between the incongruent melts and the corresponding ternary solid solutions. Our findings confirm earlier data on the existence region of Al 13 (Fe,Cr) 4 , but significantly differ from those with respect to the so

Intermetallic compounds in catalysis – a versatile class of materials meets interesting challenges

“…Techniques for growing large intermetallic single-crystals involve growth by the Czochralski (e.g. in the Al-Cr-Fe system [ 141 ]) or Bridgeman (e.g. in the Yb TX system with T = Cu, Ag, Pt or Au and X = Sn or Sb) techniques as well as synthesis from metallic fluxes.…”

Influence of Cr, Mn, Co and Ni Addition on Crystallization Behavior of Al13Fe4 Phase in Al-5Fe Alloys Based on ThermoDynamic Calculations

“…Additionally, the compromised stability promotes the formation of other metastable phases, such as Al 6 Fe, in the Al-Fe alloy after the substitution of Cr and Mn. One should note that the formation of the metastable Al x Fe phase in Al-Fe alloys due to the addition of Cr and Mn has been reported [ 13 , 41 ].…”

“…Hence, M elements easily substituted Fe-sites in the Al 13 Fe 4 phase. It has been reported that these four elements are more likely to occupy the Fe sites [39][40][41][42]. If M substitutes one Fe atom in the Al 13 Fe 4 unit cell, no phase transition occurs and the proportion of substituted atoms remains at~0.98 at%.…”

Passivation/precipitation mechanisms of Al-Cr-Fe Complex Metallic Alloys in acidic chloride containing electrolyte

“…The polycrystalline cubic gamma phase was provided by the "Institut Jean Lamour (IJL)" of Nancy (France). Further details on the preparation of the different phases can be found in [8,[18][19][20]. Pure polycrystalline 99.99% at Al, 99.98% at Cr and 99.99% at Fe (Goodfellow, UK) were used as comparative reference materials.…”