| CODE | MME1202 | ||||||||||||||||
| TITLE | Physical Metallurgy and Diffusion | ||||||||||||||||
| UM LEVEL | 01 - Year 1 in Modular Undergraduate Course | ||||||||||||||||
| ECTS CREDITS | 5 | ||||||||||||||||
| DEPARTMENT | Metallurgy and Materials Engineering | ||||||||||||||||
| DESCRIPTION | This unit describes the different mechanisms of diffusion, factors affecting diffusion and Fick's laws of diffusion (steady and non-steady state diffusion). It also introduces the formation of binary alloys, together with the construction of phase diagrams. The changes occurring during solidification of alloys at different temperatures and compositions are presented. Eutectic, peritectic, eutectoid and peritectoid transformations are also explained. Gibb's phase rule is introduced. Interstitial and substitutional solid solutions are explained together with intermediate phases, and the principles of dispersion strengthening. This leads to the introduction of the iron-carbon phase diagram, highlighting the difference between steel and cast iron, the development of iron-carbon alloys and their mechanical properties. The principles of heat treatment (annealing, normalising, quenching and tempering) of ferrous alloys, using TTT and CCT diagrams are presented, together with the study of their hardenability using the Jominy test. Precipitation hardening of non-ferrous alloys is explained. Surface hardening of ferrous alloys is briefly explained. The effect of alloying elements on the polymorphic transformation temperature, grain growth, eutectoid point and transformation rates is presented. Study-unit Aims The aims of this study-unit are to be able to understand the principles of diffusion and a phase diagram, in particular the iron-carbon phase diagram. It also aims to provide knowledge of heat treating ferrous and non-ferrous alloys, and to understand the resulting microstructure using known diagrams. Learning Outcomes 1. Knowledge & Understanding: By the end of the study-unit the student will be able to: 1. understand the different regions of a phase diagram 2. know the Fe-C phase diagram and its importance 3. explain the resulting microstructure of solidified binary alloys 4. explain different diffusion mechanisms, factors affecting diffusion, understand Fick's laws 5. interpret the different heat treatments (annealing, normalising,quenching,tempering) 6. understand TTT and CCT diagrams 7. explain precipitation hardening of non-ferrous alloys 2. Skills: By the end of the study-unit the student will be able to: 1. interpret a phase diagram and be able to explain what is happening as an alloy cools from the liquid stage to room temperature 2. draw and understand the Fe-C phase diagram 3. construct a phase diagram given different cooling curves at different compositions 4. apply Fick's laws of diffusion to determine concentration gradient, diffusivity or concentration of diffusing species after a certain amount of time 5. determine the heat treatment required to obtain certain mechanical properties (particularly in steel) Main Text/s and any supplementary readings Main Textbook: [1] Materials Science and Engineering: An Introduction - W. D. Callister (Wiley, 2006) Available: UOM library Supplementary Readings: [1] Introduction to Materials Science for Engineers - J. F. Shackelford (Prentice Hall, 2008) Available: UOM library [2] Engineering Metallurgy - Higgins Raymond A. (1993) Available: UOM library [3] Modern Physical Metallurgy and Advanced Materials - Smallman R. E. (2007) Available: UOM library |
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| ADDITIONAL NOTES | Pre-requisite Study-unit: MME1201 | ||||||||||||||||
| STUDY-UNIT TYPE | Lecture, Independent Study, Practicum & Tutorial | ||||||||||||||||
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| LECTURER/S | Sophie Briffa |
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The University makes every effort to ensure that the published Courses Plans, Programmes of Study and Study-Unit information are complete and up-to-date at the time of publication. The University reserves the right to make changes in case errors are detected after publication.
The availability of optional units may be subject to timetabling constraints. Units not attracting a sufficient number of registrations may be withdrawn without notice. It should be noted that all the information in the description above applies to study-units available during the academic year 2023/4. It may be subject to change in subsequent years. |
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