Effect of Mo addition on microstructure, ordering, and room-temperature mechanical properties of Fe-50Al

Yildirim M., Akdeniz M. V., Mekhrabov A.

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA, vol.28, pp.1970-1979, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 28
  • Publication Date: 2018
  • Doi Number: 10.1016/s1003-6326(18)64842-3
  • Journal Name: TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1970-1979
  • Keywords: iron aluminides, microstructure, order-disorder phase transformation, compressive properties, ALLOYING ELEMENTS ADDITION, FE-AL, LAVES PHASE, IRON ALUMINIDES, INTERMETALLICS, DEFORMATION, EQUILIBRIA, BEHAVIOR, FRACTURE, SYSTEM
  • Middle East Technical University Affiliated: Yes

Abstract

The effects of Mo addition on microstructures, phase relationships, order-disorder phase-transition temperatures and room-temperature mechanical properties of Fe50Al50-nMon alloys (n=1, 3, 5, 7, and 9, mole fraction, %) were investigated after solidification and heat treatment. Structural characterization of the samples was performed via X-ray diffraction (XRD), scanning electron microscopy (SEM) and differential scanning calorimetry. Room-temperature mechanical properties were investigated by conducting compression and microhardness tests. Mo3Al particles precipitated in all alloys because of the limited solid solubility of Mo in the Fe-Al-based phases. The as-cast Fe50Al50-nMon alloys exhibited brittle behavior with high yield strength and limited fracture strain at room temperature. Compared with the as-cast alloys, all the heat-treated alloys except for the Fe50Al41Mo9 alloy exhibited enhanced mechanical properties at room temperature. The heat-treated Fe50Al43Mo7 alloy exhibited the highest fracture strain and compressive strength of 25.4% and 2.3 GPa, respectively.