Phase Transformations in Fe1-2xAlxVx (x≤0.15) Alloys☆

Abstract Iron rich Fe-Al-V alloys have a considerable potential as structural materials at high temperatures. In previous works we have studied the phase equilibria in the bcc system Fe-Al-V, from computational thermodynamics calculations. There, the vertical section Fe 1-2X Al X V X was defined as the best candidate to design alloys with technological application, due to its wide (A2+L2 1 ) two-phase field. In this paper, experimental techniques of Differential Scanning Calorimetry (DSC) and Transmission Electron Microscopy (TEM) are used to find the phase equilibria in Fe 1-2X Al X V X section up to 1100 °C and X≤0.15. The A2/B2 order-disorder transformation was confirmed, the limits of two-phase fields (A2+L2 1 ) and (L2 1 +B2) with L2 1 as coherent precipitate were established, and evidence of a small (A2+B2) field previously unknown was found. The experimental assessment of these phase equilibria opens the way to the design of these alloys and their possible heat treatments