The formation of defects in Fe–Al alloys

Dependence of electrical resistivity of Fe–Al alloys on composition

“…In the B2 structure practically no effect of the HT was observed, the resistivity is controlled by structural order, and not by the vacancy concentration. The maximum resistivity near 37 at.% Al is in agreement with the previous resistivity data published in [1,5,6], it corresponds with the lowest structural long-range order in the matrix (the D0 3 structure becomes B2 at room temperature for this composition). The further increase of Al content increases the long-range order and lowers the resistivity in B2 structure.…”

“…The data for HT state are in quite good agreement with literature data (dashed curve) for long-range ordered Fe-Al alloys [5], the higher value for 20 at.% Al is due to disordering in the two-phase (a þ D0 3 ) matrix [6]. This corresponds also to the fact that for 20 at.% Al there is no difference between AP and HT values, indicating negligible contribution of the ordered D0 3 phase to the resistivity of this alloy.…”

“…The open and full symbols indicate data measured in AP state and HT state, respectively. The full line connecting points serves as a guide for the eye, the dashed line represents literature data[5]. The error bar (right) shows the absolute error of plotted data.…”

The stress anomaly in FeAl–Fe3Al alloys

“…Fig. 5 shows a summary of vacancy formation enthalpy values from very many research studies [39,40,[42][43][44]46,48,49,[60][61][62][63][64][65][66][67] as a function of Al content. Data has here been separated into three domains, following the ideas of Hehenkamp and workers [63,65], and according to the phase diagam proposed by Kubaschewski [68].…”

FEM simulation of periodical local heating caused by Laser Interference Metallurgy

“…The results were explained by melting and internal graphitization of the films. In metals, the increase of the electrical resistance after structuring can be explained by changes in the topography and formation of defects induced by the local heating (Kass et al, 2002;Stach et al, 2003). Both simulated fluences show a good agreement in the period of time at which the heating and cooling processes occur (400 and 600 ns for 61 and 130 mJ/cm 2 respectively).…”