21-Mat-A4 Deformation Behaviour and Properties of Materials, May 2016: worked solutions

Paper format. National Exams, May 2016 — 10-Met-A4, Structure of Materials. Three hours, closed book, one approved calculator (Casio or Sharp). Eight questions of 20 marks each (Roman numerals I–VIII); the rubric asks for any five, with only the first five in the answer book marked. All eight are solved here, because this set is a study resource rather than an exam script. All necessary equations, constants and an error-function table are provided in the exam's own appendix (reproduced where used below).

Note on the exam title. The printed exam header reads 10-Met-A4, Structure of Materials. Only Question VIII (mechanical deformation) is genuinely deformation/mechanical-properties content; the paper as a whole is a broad introductory materials-science survey — bonding, crystal structure, crystallographic directions/planes, imperfections, phase diagrams, XRD and diffusion — and is answered as such below.

Reference texts. The answers below are keyed to the works normally recommended for this syllabus code:

W. D. Callister and D. G. Rethwisch, Materials Science and Engineering: An Introduction, 10th ed. — atomic bonding, crystal structure, crystallographic directions/planes, imperfections, diffusion, XRD, mechanical properties, phase diagrams.
G. E. Dieter, Mechanical Metallurgy, 3rd ed. — stress–strain behaviour, elastic–plastic response.

21-Mat-A4 Deformation Behaviour and Properties of Materials: May 2016