Abstract
The fracture of grain boundaries in electron beam zone refined bi-crystals of tungsten has been investigated by propagating a crystallographic crack towards twist boundaries of controlled misorientation. Intergranular failure is interpreted by means of a Griffith type criterion for the two competing processes of fracture on the grain boundary and on the crystallographic plane in the second grain. The effects of plastic deformation, impurity segregation and lattice defects on the misorientation dependence of the crack initiation and propagation processes are discussed. The use of the value of grain boundary free energy obtained under equilibrium thermodynamic conditions cannot explain the experimental data. It is suggested that the non-equilibrium structure of the grain boundaries controlled their fracture behavior.
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