The mechanical properties of an Fe-28at%Al alloy were studied at temperatures ranging from ambient to 700C. Solute additions to this alloy led to higher strengths, at all temperatures, than that which was exhibited by the binary alloy. These high strengths were associated with dissociated imperfect super-dislocations, from room temperature up to a stress peak. An anomalous stress peak was found at 500C; somewhat below the temperature range where disordering of D03 order to give the B2 ordered state occurred, and the Burgers vectors of the dislocations which were present changed from <111> to <100>. The reason for the anomalous peak, for the locking of <111> super-dislocations and for the eventual change to <100> dislocations, was a local climb-locking process which operated on the <111> super-dislocations.

D.G.Morris, D.Peguiron, M.Nazmy: Philosophical Magazine A, 1995, 71[2], 441-63