Characterization of microstructures and age hardening of Fe 1-2xAlxVx alloys

P. A. Ferreirós, P. R. Alonso, P. H. Gargano, P. B. Bozzano, H. E. Troiani, A. Baruj, G. H. Rubiolo* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

13 Citations (Scopus)

Abstract

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
JournalIntermetallics
Volume50
DOIs
Publication statusPublished - Jul 2014
MoE publication typeA1 Journal article-refereed

Funding

PAF was supported by a UNSAM/CNEA master fellowship. We greatly appreciate Dr. C.G. Schön for giving access to his computer code cvm17bf2a (ternary equilibrium).

Keywords

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

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