Quiz3_2003 - First Name Last Name Student No MSE101H1F...

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First Name _________________ Last Name___________________ Student No__________________ MSE101H1F –Materials Science Tutorial Section/TA__________________________ UNIVERSITY OF TORONTO FACULTY OF APPLIED SCIENCE AND ENGINEERING Quiz #3 MSE 101H1F Materials Science 2003 Examiners: T. W. Coyle, S.J. Thorpe Total marks for all questions: 20 Marks are not equal for all questions – Marks are shown in left hand margin 1. The ability to modify the structure of a material, and to understand the corresponding effect on material properties is the fundamental basis of materials science. The strengthening of metals is one example of such a structure – property relationship. 2 (a) Identify four principle mechanisms for strengthening metals in the space below. i. cold working/strain hardening/work hardening ii. grain size reduction iii. solid solution strengthening iv. precipitation hardening 2 (b) What is the fundamental principle linking each of these mechanisms to dislocations? All of these mechanisms inhibit dislocation movement, and so a higher resolved shear stress is required to force the dislocations to move through the crystal lattice. Since plastic
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