Question

Describe the splitting of a/2 <110> 60 degree dislocation in Al into Shockley partials. Calculate the width of stacking faults for these dislocations in Al, assuming the stacking fault energy to be 100 ergs cm' and shear modulus 2.65x10''dynes cm'.

Answer 1

Go , mixed dislocation Stacking fault enersy energy SFG 2 TT da 6,= <110) bz = a[211] width of Stacking fault by = (127) der cm dyne Tina Zero le =) Fis positive (5.b) Cerbe) Belo rad 25(1-0) attraction repulsion a bq = bz = a 0 111 ) F is positive y (repulsive) » Stacking fault enersy act against expansion, Port = Go 4x du 2.65x18" x (0.4057 du - पा x 100 T JE = 5.760108cm = 5.76x10om ( dw = 5.76 40