Misorientation dependence of discontinuous precipitation in Cu-Be alloy bicrystals

摘要: The boundary-dependent discontinuous precipitation (DP) for various [001] symmetric tilt boundaries in Cu–5.2 at% Be alloy bicrystals has been examined the temperature range 523–698 K. precipitate phase maintains a constant interlamellar spacing under isothermal growth conditions. increases with an increase temperature. incubation period τ to initiate DP and cell rate against misorientation angle diagrams show local peaks cusps at same angles. positions of agree those boundary energy diagram. formation occur more easily higher-energy boundaries. A detailed kinetic analysis experimental data using models by Turnbull Petermann–Hornbogen enabled determination grain-boundary diffusivity along each studied. close correlation is found between higher smaller activation pre-exponential factor.