EFFECT OF Bi SEGREGATION ON GRAIN BOUNDARY EMBRITTLEMENT OF Cu BICRYSTALS WITH [001] SYMMETRICAL TILT BOUNDARIES
Bi偏聚对[001]对称倾侧Cu双晶晶界脆性的影响

The effect of Bi segregation at grain boundary on the fracture behaviour and grain boundary embrittlement was studied by using orientationcontrolled Cu bicrystals with 001] symmetrical tilt boundary.The results indicate that the fracture behaviour and fracture stress of Cu-Bi bicrystals depend strongly on the misorientation, and the grain boundary embrittlement is not related to the density of coincidence site lattice of the grain boundary but to the unsegregated grain boundary energy. the higher the grain boundary energy- the stronger the grain boundary embrittlement. The dependence could be explained by considering the boundary-dependent segregation of Bi atoms.