ABSTRACT
Core structures of a+c dislocations are simulated in a Lennard- Jones model crystal. Both edge and screw dislocations glide on https://www.w3.org/1998/Math/MathML"> { 11 2 _ 2 } https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429070914/679f2623-d509-4a65-a488-93e3a3b19d40/content/eq279.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/> under such a shear stress as is acting on https://www.w3.org/1998/Math/MathML"> { 11 2 _ 2 } https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429070914/679f2623-d509-4a65-a488-93e3a3b19d40/content/eq280.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/> in a single crystal compressed along the c axis. Under the opposite stress, https://www.w3.org/1998/Math/MathML"> { 11 2 _ 1 } https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429070914/679f2623-d509-4a65-a488-93e3a3b19d40/content/eq281.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/> twin develops from the edge dislocation core while screw dislocations glide on https://www.w3.org/1998/Math/MathML"> { 10 1 _ 1 } . https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429070914/679f2623-d509-4a65-a488-93e3a3b19d40/content/eq282.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/> When glide, the dislocations dissociate into partials with the Burgers vector of (a+c)/2. The result is compared with the experimental observations and shown to be in fair agreement with them.
