Mecl l Behavior of metallic materials Theoretical Strength of a Crystal shear elastic modulus G6 G ≈ ≈ 2a2丌 maximum theoretical strength of crystal CHONGQING UNIVENTTY
Mechanical Behavior of Metallic Materials Theoretical Strength of a Crystal 2 2 m Gb G a maximum theoretical strength of crystal shear elastic modulus
Mechanical Behavior of metallic Materials material experimental yield G/2兀, GPa strength,MPa /z,10 exp Silver 12.6 0.37 ~30 Aluminum 11.3 0.78 ~10 Copper 19.6 0.49 40 Nickel 32 3.2-7.4 10 Iron 33.9 27.5 Magnesium 7 0.39 ~20 Titanium 169 13.7 ③千大
Mechanical Behavior of Metallic Materials material , GPa experimental yield strength, MPa Silver 12.6 0.37 ~30 Aluminum 11.3 0.78 ~10 Copper 19.6 0.49 ~40 Nickel 32 3.2-7.4 ~10 Iron 33.9 27.5 ~1 Magnesium 7 0.39 ~20 Titanium 16.9 13.7 ~1 3 exp ,10 m G 2
Mechanical Behavior of metallic Materials Dislocations The existence of lattice defect would allow plane of atoms to slip at much lower stress levels o As the dislocation line moves through the crystal bond breakage across the slip plane occurs consecutively rather than simultaneously as was necessary in the perfect lattice The major point is that it takes much less energy to break one bond at a time than all the bonds at once ③大季
Mechanical Behavior of Metallic Materials ⚫ The existence of lattice defect would allow plane of atoms to slip at much lower stress levels. ⚫ As the dislocation line moves through the crystal, bond breakage across the slip plane occurs consecutively rather than simultaneously as was necessary in the perfect lattice. ⚫ The major point is that it takes much less energy to break one bond at a time than all the bonds at once. Dislocations
Mechanical Behavior of metallic Materials Dislocation Line Screw sheared ed unsheared dislocation line ③大季
Mechanical Behavior of Metallic Materials
Mechanical Behavior of metallic Materials D B A B C D ○(苏 ⊥ b X X )>x
Mechanical Behavior of Metallic Materials