Mechanical spectroscopy in Fe–Al–Si alloys at elevated temperatures

Mechanisms of anelasticity in Fe–13Ga alloy

“…As grain boundary dislocations play an important role in grains sliding, their mobility is different in ordered and disordered state. In FDIF tests at "heating" the material is partly ordered, while at "cooling" tests start from disordered state, and this, similarly to the FeeAleSi alloys [15], might be the reason for increase in the P6 peak height at cooling. The calorimetric tests of Fee13Ga quenched specimen show an exothermic peak due to the formation of ordered Fe 3 Ga phase at about 265e275 C and a little endothermic peak at around 645 C due to its dissolution [16].…”

Structure and electromagnetic characteristics of flaky FeSiAl powders made by melt-quenching

“…Earlier in 1980, Ohmori et al [11] made this kind of ribbons and found the normal direction of ribbons planes were parallel to (1 0 0) and (1 1 0) crystal planes, and it was related to grain growing. Some researchers studied the influences of aluminum and silicon on the degree of order in this alloys [12]. The structure of FeSiAl alloy is similar to that of FeAl alloy; Ikeda et al [13] studied the transformation among A2, B2 and D0 3 structures.…”

Order Evolution in Iron-Based Alloys Viewed through Amplitude Dependent Damping Studies

“…On the other side, the D0 3 order evolves mainly near the equilibrium value of the D0 3 order parameter since the D0 3 ¼ B2 transition is at a lower temperature. 1) It is interesting to note that for the temperatures where the refection (111) (full triangles) starts to decrease, over around 860 K, S starts to increase (empty circles). As said before, a decrease in the order degree leads to an increase in the dislocation mobility allowing larger bowings of the dislocation line which are able of interacting with a larger amount of weak pinning points, leading to an increase in S values.…”

“…The lower is the D0 3 orderdisorder transition temperature, the lower is the peak temperature. 1) On the other side, for Fe-Al-Cr alloys the intensity of the peak recorded during the cooling is around three times larger than the value measured during heating, this peak being related to the solute grain boundary relaxation of the aluminium and chromium. 2) In binary FeSi alloys a higher degree of order (B2) accompanied by a grain boundary blocking leaded to a smaller peak height of the grain boundary solvent peak which appears at around 800 K.…”

“…The degree of order and the defect configuration both influence the mobility of dislocations and grain boundaries in Fe25 at%(Al + Si), Fe15 at%(Al + Si), 1) Fe-25 at%Al-8 at%Cr, Fe-25 at%Al-25 at%Cr 2) and in Fe10 at%Si. 3) In FeAlSi and Fe-Al-Cr alloys a decrease in the order degree after heating up to 1200 K and 1050 K, respectively leads to the appearance or enhancement of a damping peak at around 1000 K during the subsequent cooling measurement.…”