Mechanical behaviour of metals and alloys
4 points * two lectures per week plus tutorials * First semester * Clayton * Prerequisites: MTE2511, MTE2512
Deformation of single crystals, critical resolved shear stress and lattice rotation. Deformation of polycrystals, five slip system criterion, deformation textures. Experimental determination of preferred orientation. Effects of fcc, bcc, hcp crystal structures. Dislocation motion and interaction. Climb and cross slip. Yielding and yield point phenomena, strain ageing. Effects of temperature and strain rate. Theories of work hardening in pure metals, effect of temperature and stacking fault energy, the structure of cold worked metals. Strengthening mechanisms: solid solutions, precipitates, grain boundaries, fibres and dispersoids. Effects of work hardening and deformed microstructure. Inhomogeneity of plastic deformation and its consequences. The tensile test, standards for testing, characteristics of testing machines, extensometers. Constitutive laws for plastic deformation. Necking and plastic instability. Considere's construction.
Assessment
Examinations: 60% * Assignments: 20% * Laboratory work: 20%
Recommended texts
Cahn R W and others (eds) Materials science and technology vol. 6 Plastic deformation and fracture in materials VCH Publications, 1994
Dieter G Mechanical metallurgy 3rd edn, McGraw-Hill, 1986
Hertzberg R W Deformation and fracture mechanics of engineering materials Wiley, 1976
Honeycombe R W K Plastic deformation of metals 2nd edn, Edward Arnold, 1984
Hull D and Bacon D G Introduction to dislocations 3rd edn, Pergamon, 1984