Segregation and corrosion behaviour of incommensurate 45°[100] grain boundaries in an FeSi alloy: The role of grain boundary plane orientation

Grain boundaries in ultrafine grained materials processed by severe plastic deformation and related phenomena

“…This latter phenomenon has been widely investigated in numerous alloys because of its dramatic influence on the mechanical behaviour (creep, toughness or ductility). For example, it has been reported that in Al alloys Mg may segregate along grain boundaries [44][45][46], similar features were observed for Si, P and C in bcc Fe [47], while B exhibits the same behaviour in Ni 3 Al [48], FeAl [49], but was also detected along /" heterophase interfaces in superalloys [50]. Moreover, small quantities of residual impurities (especially of strongly segregating ones like P, S or C in Cu or Ni) can significantly modify GB diffusivities even at the ppm level [51,52].…”

Growth of metallic bicrystals with high-energy grain boundary orientation

“…According to the grain boundary plane classification [7,11,12] as well as the segregation behavior of the grain boundaries [8], the f0 k l g symmetrical tilt grain boundary is a typical high-energy general interface while the (0 0 1)(0 1 1) asymmetrical tilt grain boundary is the representative of the low-energy special grain boundaries. The (0 1 5)(0 3 2) asymmetrical tilt grain boundary is composed of two planes creating special symmetrical tilt grain boundaries, and thus it can also be considered as a low-energy interface [8,11,12]. The remaining short facet of the (0 1 13)(0 7 6) asymmetrical tilt orientation is very close to the (0 1 5)(0 3 2) and can be considered as its vicinal interface.…”

“…The anisotropy of interfacial energy may be substantial and results in different behavior of individual grain boundaries. For example, the values of enthalpy of phosphorus segregation at the symmetrical f0 k lg and asymmetrical (0 0 1)/(0 1 1) tilt grain boundaries in the 45 ½1 0 0 bicrystal of a-iron are À37 and À19 kJ=mol; respectively, i.e., they differ by a factor of 2 [8]. The differences in interfacial energy also represent the basis for classification of interfaces onto low-energy special, high-energy general and transitive vicinal grain boundaries [7].…”

Interstitial and substitutional solute segregation at individual grain boundaries ofα-iron: data revisited

“…In this way, the anisotropy of grain boundary segregation was determined, which can serve as a base for the concept of Grain Boundary Engineering [6]. A system atic experimental study-anisotropy of the segregation of phosphorus, silicon and carbon in αiron-was carried out, and the results were published in the 1990s [7][8][9][10][11][12][13][14]. Simultaneously, the energy of grain boundary segregation (which is very close to the enthalpy because the volume effect of the segregation is very small [15]) was calculated on the basis of theoretical approaches.…”

“…As mentioned above, the segregation of silicon, phos phorus and carbon at numerous individual grain boundaries in bicrystals of αiron was measured previously [7][8][9][10][11][12][13][14]. In these papers, we evaluated the solute segregation according to the Guttmann model [26] accounting for two lattices, substitu tional and interstitial.…”