Dislocation loop-free zones around grain boundaries in quenched aluminium and aluminium alloys

摘要: Abstract Measurements have been made of the width dislocation loop-free zones formed around 〈100〉 tilt boundaries in quench-aged pure aluminium and some dilute solid solutions as a result vacancy-loss to boundary during cooling. The is found increase quench-rate decreases except for slowest used. data are analysed terms vacancy-concentration profile derived simple monovacancy diffusion linear quench rate, assuming that critical vacancy concentration required loop nucleation. This from nucleation theory. Reasonable agreement between measured calculated obtained. model suggests relationship square zone reciprocal (linear) rate. rapidly angle below ∼ 3° this interpreted loss sink efficiency at small misorientations. indicat...