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Grain boundary intrinsic mobility

Intrinsic grain boundary mobility discussed above. [Pg.332]

The boundary mobility Mb is determined by the difiusion coefficient Da for the atomic migrates across the grain boundary of the pure material, which is called intrinsic boundary mobility. In ionic solids, because both cations and anions could diffuse, Da is the difiusion coefficient of the species that are rate-limiting or lowest. In real ceramics, various drag forces, such as segregated solutes, inclusions, pores, and second-phase films, can be applied to the grain boundary. As a result, experimental boundary mobility is lower than the Mb given by Eq. (8.30) in most cases. [Pg.532]

On the other hand, for (a small number of) pores with high mobilities, NMf, Mp is satisfied. The migration of the grain boundary is then controlled by its intrinsic mobility (boundary control). The pores do not affect the boundary migration and v is reduced to... [Pg.148]

Figure 9.25 Selected grain boundary mobilities for some ceramics compared with the calculated intrinsic boundary mobility. (From Ref. 44.)... Figure 9.25 Selected grain boundary mobilities for some ceramics compared with the calculated intrinsic boundary mobility. (From Ref. 44.)...
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See also in sourсe #XX -- [ Pg.557 , Pg.585 ]



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Boundary mobility

Boundary/boundaries grains

Intrinsic mobility

Mobility grain boundary

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