Influence of Al concentration on the short-range and long-range diffusion of carbon in Fe–Al alloys

Diffusion of carbon in bcc Fe in the presence of Si

“…5,13 Here, we find that Si interacts with C up to and including the sixth shell but not beyond that shell.…”

“…30 More recent Snoek-type measurements have given a similar activation energy of 0.84 eV. 5,23 For completeness, the energy of substitutional C was computed as well. It is found to be about 2.22 eV above that of octahedral C so that under near equilibrium conditions, the occurrence of substitutional C can be ruled out.…”

“…Possibly, aluminum acts in a similar fashion. In fact, recent mechanical spectroscopic evidence 5,13 points in this direction. These experiments show that the activation energies for carbon jumps are affected by alloying elements such as Si and Al.…”

“…These experiments show that the activation energies for carbon jumps are affected by alloying elements such as Si and Al. 5,13 The effect is found to be stronger when the alloy is cooled slowly, presumably because then the carbon atoms have had time to equilibrate around the Si atoms. 13 The presence of Si gives rise to a broadened activation energy spectrum as compared to the activation energies observed for Fe-C without Si.…”

Structure and anelasticity of ordered and disordered Fe–Ge alloys

“…Following a preliminary discussion for part of the alloys studied [22], we will present here detailed results for the complete alloy series in a systematic way. These results will first be discussed individually, in relation to the specific structures and phase transitions, and then in a common overview compared with anelastic relaxation spectra in the related alloys Fe-Al [19,23,24] and Fe-Si [19,23] with their different electronic binding features and effective atomic sizes, which determine the resulting structures, in order to assign specific mechanisms to the observed peaks.…”