Characterization of microstructures and age hardening of Fe1-2xAlxVx alloys

P.A. Ferreirós, P.R. Alonso, P.H. Gargano, P.B. Bozzano, H.E. Troiani, A. Baruj, G.H. Rubiolo

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


The Fe-rich corner of the Fe–Al–V system has shown phase separation into disordered A2 and ordered L21 phases. In a former work we model this ordering reaction by using ab-initio thermodynamics. The approach is now employed to suggest the Fe1−2xAlxVx alloys in order to reduce the Al content by increasing the addition of vanadium looking for a better ductility of the solid solution which can be afterwards strengthened by coherent L21 precipitates. Four alloys with compositions in the range 0.08 < X < 0.15 were studied. The phase transition temperatures and microstructures of the alloys were characterized by differential scanning calorimetry (DSC) and transmission electron microscopy (TEM), respectively. The region (A2 + L21) occurs for 0.10 < X < 0.15 up to maximum temperature of 720 °C, higher temperatures causes the appearance of (A2 + B2), B2 and (B2 + L21) regions. The microstructure in the (A2 + L21) region consists of nanosized precipitates of L21 phase in A2 matrix which morphology evolutes with temperature and ageing time. The hardness values, measured at room temperature, for the alloys with X < 0.125 and ageing temperature between 650 and 700 °C are comparable to those obtained with other Fe–Al based alloys.
Original languageEnglish
Pages (from-to)65-78
Number of pages14
Early online date14 Mar 2014
Publication statusPublished - Jul 2014


  • A. Iron aluminides (based on Fe3Al)
  • B. Alloy design
  • B. Age-hardening
  • E. ab-initio calculations
  • F. Calorimetry
  • F. Electron microscopy, transmission


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