Motion of Dislocations by Glide Movement of a dislocation by glide in response to shear stress Shear Stress Easy motion of Stress induced by dislocations Mismatch of thermal expansion coefficients Temperature gradient AT g=aY△TMotion of Dislocations by Glide Movement of a dislocation by glide in response to shear stress St i d d b Easy motion of dislocations Stress in duce d by • Mismatch of thermal expansion coefficients • Tem p g erature gradient ∆ T σ = αY∆ T