Intergranular layer

Electrical characteristics are controlled by the composition and size of the crystals, slightly modified by the thin intergranular layer, the residue of the glass phase. Optical transparency is determined to a large extent by scattering (see Section 8.1.5) and necessitates controlling the crystallite size to about 50nm (Fig. 3.7). 

SEM pictures of the formed part of the corrosion layer, (a) corrosion layer with visible intergranular layer, (b) the interganular layer in the corrosion layer has dissolved (dark lines). 

Composite stones can be constructed by joining different stones as illustrated in Figure 36.31. One of these methods is essentially equivalent to making a bicrystal with an amorphous (polymer) intergranular layer. 

An experimental magnesium-base alloy sheet containing 14 % lithium and 2 % aluminum was reported to have experienced intergranular layer attack similar to the exfoliation of 2duminum-copper alloys [8],... 

The emission of the Poole-Frenkel type assumes the formation of coulombian centers in the grain-intergranular layer interface region. The relationship that describes this type of emission is on Equation 9, where the external electric field variations are more relevant than for issue... 

Low-temperature eorrosion eharaeteristieally shows no denuded zone, no intergranular attaek, and a layered type of eorrosion seale. 

Budd and Booth found the potentiostatic test best for investigating the intergranular and layer corrosion of aluminium alloys. 

For conduction through the sensitive layer, the electrons have to pass the intergranular contacts and associated potential barriers. The height of these barriers depends on the composition of the ambient gas atmosphere. 

NOTE Overlays or hard surfaces that contain more than 0,10% carbon can sensitise both low-carbon and stabilised grades of austenitic stainless steel unless a buffer layer that is not sensitive to intergranular corrosion is applied. 

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