Effect of vanadium on atomic ordering characteristics and anti-phase boundary energies of B2-FeCo alloys


AYKOL M., MEKHRABOV A. , AKDENİZ M. V.

INTERMETALLICS, vol.18, no.5, pp.893-899, 2010 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 18 Issue: 5
  • Publication Date: 2010
  • Doi Number: 10.1016/j.intermet.2009.12.029
  • Title of Journal : INTERMETALLICS
  • Page Numbers: pp.893-899

Abstract

Effect of V on the energetical and structural characteristics of atomic ordering processes of B2-FeCo intermetallics have been investigated via electronic theory of multi-component alloys combined with Monte Carlo (MC) simulations. Emphasis has been placed on the variation of anti-phase boundary (APB) energies with V content and temperature to establish a relationship between ductility and atomic ordering characteristics of (FeCo)(100-x)V(x) (x = 0-5 at%) alloys. It was shown that APB energies are highly affected by actual degree of long range order (LRO) and also dissolution mode of V alloying element atoms. Results of present simulation reveals that partially ordered (FeCo)(100-x)V(x) alloy having x = 2 at% V facilitates the highest loss in {110} APB energy in temperature range of 300-750 K and yields drastic increase in < 111 > {112} APB energies with increasing concentration of V due to pinning effect. Owing to the lowest APB energy of {110} planes, (FeCo)(98)V(2) alloy would be predicted to display higher ductility, in agreement with experimental observations, relative to binary B2-FeCo intermetallic due to more independent movement of a/2 < 111 > partials at low temperatures. (C) 2009 Elsevier Ltd. All rights reserved.