AMME1362 Chapter Notes - Chapter 7: Atomic Diffusion, Parent Material, Solid Solution Strengthening

• School: University of Sydney
• Department: Aeronautical Engineering (Mechanical)
• Course: AMME1362
• Professor: Xiaozhou Liao

Document Summary

7. 1 introduction: plasti(cid:272) defor(cid:373)atio(cid:374) is per(cid:373)a(cid:374)e(cid:374)t, a(cid:374)d stre(cid:374)gth a(cid:374)d hard(cid:374)ess are (cid:373)easures of a (cid:373)aterial(cid:859)s resista(cid:374)(cid:272)e to this deformation, plastic deformation corresponds to the net movement of large numbers of atoms in response to an applied stress. Interatomic bonds must be ruptured and then re-formed. Its dislocation line passes through the center of a spiral, atomic plane ramp. Many dislocations in crystalline materials have both edge and screw components; these are mixed dislocations: plastic deformation correspond to the motion of large numbers if dislocations, slip- process by which plastic deformation is produced by dislocation motion. When plastically deformed, some fraction of the deformation energy (~5%) is retained internally; the remainder is dissipated as heat. Atoms immediately above and adjacent to the dislocation line are squeezed together. Subsequently, these atoms may be thought of as experiencing a compressive strain relative to atoms positioned in the perfect crystal and far removed from the dislocation.