Introduction of dislocation 上产克大睾 SHEAMGHAI DUD TONO UHTVEREETTY Questions 1)How do metals plastically deform? Taylor,Orowan and Polanyi 1934:Plastic deformation is due to motion of large number of dislocations. Plastic deformation under shear stress ●●●●●●●●● 000ǜ00 ● 0o000●0 2)Why deformation occurs at stresses smaller than those for perfect crystals? Dislocations allow deformation at much lower stress than in a perfect crystal. Institute of Forming Technology Equipment 5Introduction of dislocation Institute of Forming Technology & Equipment 5 Questions 1) How do metals plastically deform? Taylor, Orowan and Polanyi 1934 : Plastic deformation is due to motion of large number of dislocations. Plastic deformation under shear stress 2) Why deformation occurs at stresses smaller than those for perfect crystals? Dislocations allow deformation at much lower stress than in a perfect crystal