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Grain junctions

Figure 14.9 shows a three-grain junction on the surface of polycrystalline AI2O3 after high-temperature annealing. Each grain surface has a different inclination... [Pg.349]

However, Plateau s laws are not obeyed by the grain boundary structure in the special polycrystal in Fig. 15.15. To achieve local equilibrium at all grain junctions, so that Plateau s laws are obeyed, the faces of each grain must be curved [31]. A boundary structure in which all junctions obey Plateau s laws is presented in Fig. 15.16, which shows a polycrystal consisting of six grains that meet at four vertices. Each grain fully occupies one face of the polycrystal. As in Fig. 15.15,... [Pg.379]

FIGURE 16,18 Mechanism for pore detachment from the grain boundary consisting of (a) a pore at a three grain junction, (b) a pore at a two grain junction, and (c) a pore detached from the grain boundsuy. Taken from Fang and Palmour [41]. Eeprinted by permission of the American Ceramic Society. [Pg.808]

Dihedral angle of liquid on triple grain junction... [Pg.100]

Figure 14.1 (a) Charge exchange associated with the chemisorption of oxygen at the surface of an n-type semiconductor and the potential distribution across a grain junction,... [Pg.373]

Fig. 48. Composition profile across the grain-junction for a ternary Nd-Fe-B alloy. The arrows indicate the extent of the intergranular region. (After Rames et al. 1987.)... Fig. 48. Composition profile across the grain-junction for a ternary Nd-Fe-B alloy. The arrows indicate the extent of the intergranular region. (After Rames et al. 1987.)...
Pores at grain boundaries and other grain junctions... [Pg.277]

Figure 8.15 Energy-dispersive X-ray spectra collected from glass pockets at triple grain junctions in two samples with additives of 6.25 wt% Y2O3-1.0wt% AI2O3 and 4.0wt% Y203-2.8wt% AUO3. The Al concentration was... Figure 8.15 Energy-dispersive X-ray spectra collected from glass pockets at triple grain junctions in two samples with additives of 6.25 wt% Y2O3-1.0wt% AI2O3 and 4.0wt% Y203-2.8wt% AUO3. The Al concentration was...
Figure 13.12 Two-grain junction cavities observed in SN 88 after creep at 1250°C under stress of 180 MPa after 868 h [37],... Figure 13.12 Two-grain junction cavities observed in SN 88 after creep at 1250°C under stress of 180 MPa after 868 h [37],...
Taking into account that, for polycrystals, the applied stress is one-third of the shear stress acting on the pile-up plane, the relationship between the shear stress concentration (x) and the applied stress a (x/a) must lie in the range between 40 and 75, although this would be too large to be explained by the stress concentration induced at multiple-grain junctions during GBS. Clearly, the dislocations reported by... [Pg.646]


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See also in sourсe #XX -- [ Pg.91 ]




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