Mechanical Working of Metals

At the end of this course, the student should be able to: 1. explain mechanical behaviour of metals; 2. demonstrate using diagram stress-strain relationship; 3. explain the concepts of deformation and strengthening; and 4. discuss on the effects of cold-working, hot-working and annealing.

Mechanical behaviour of materials, stress-strain diagrams for ductile and brittle metals, stress- strain relations, principal stresses, strains and directions, the Monrcircle, elastic and plastic deformations, elastic constants, plastic yield criteria. Basic concepts of dislocations, dislocation, density and dislocation motion; conservative and non-conservative motion, dislocation motion and plastic deformation. Mechanism of deformation: slip, twining, grain boundary sliding, directional diffusion. Creep, theories of creep and stress rupture. Concepts of cyclic loading and fatigue. Strengthening mechanism in metals and alloys, solid solutions, precipitation and dispersion hardening, grain size strengthening, strain hardening, martensite hardening, etc. Composite materials and fibre strengthening, hardness and strength considerations in deformation processing, effects of cold-working, hot-working and annealing.