Control of Microstructure (MT 3COMa) Continuous Assessment Assignment Dr C B Ponton (7/12/15) Your individual answers to the following questions are to be submitted as a hard copy to the School of Metallurgy and Materials Undergraduate Office th by NO LATER THAN 15:00 on Wednesday 10 February 2016 AND th
electronically as a .PDF file via Canvas by NO LATER THAN 15:00 on Wednesday 10 February 2016. AND A PDF file version of each of the complete scientific paper(s)/articles(s) referenced by you, as well as the scanned / photographed pages from any textbooks referenced by you, should be placed in a folder and the folder saved as a .ZIP file using a filename that includes your initials and surname, which should then be uploaded i.e. submitted electronically to Sendspace and the download link emailed to Dr Clive Ponton (
[email protected]). All the instructions and information given below must be followed. Coursework Layout and Submission Instructions 1. Your word text must be typed on A4 paper using Time-Roman or Times font and font size 12 and double line spacing (to give me room to write feedback). 2. Your clearly laid out mathematical text, i.e. mathematical formulae may be either: (i) entirely neatly hand-written and then inserted as scanned images into the document, or (ii) a mix of word processed text and scanned-in images of your neatly written and clearly laid out mathematical workings, or (iii) entirely word processed, using MS Equation Editor [or similar], or even using LaTex if you are familiar with it as a document preparation system. 3. All figures (i.e. drawings, graphs, images, photographs etc.) and tables should be placed on pages separate from, but as close as possible to the text page(s) referring to the given figure(s) and/or table(s), as shown in the example below. 4. To save your time, no figures and tables should be embedded within the text pages and no text must be flowed around the figures and/or tables as in a textbook. 5. Your tutorial sheet answers must be typed on A4 paper and must have no more than 4 sides of typed text (equivalent to 2 pages of A4 with text on both sides of the page). 6. This page limit excludes (a) your list of references and (b) any photographs, images, figures, graphs etc. that you incorporate in the report.
1
2
NOTE: 1. Carry out the necessary background research using the University Library on-line Catalogue System for journals (including e-journals) and monographs, textbooks, etc., as well as the Internet (but limit the number of internet-only references). 2. You can search for scientific papers of relevance using the online Web of Knowledge: http://wok.mimas.ac.uk/ and Google Scholar: http://scholar.google.co.uk/ and FindIt@Bham: http://findit.bham.ac.uk/primo_library/libweb/action/search.do?vid=44BIR_VU1 3. USE YOUR OWN INITIATIVE in finding verifiable information sources BUT AVOID ANY RISK OF PLAGIARISING by: Writing the report in your own words (i.e. not “cutting and pasting” blocks of text from the source references, even if you then reference the blocks of text!). Ensuring that all your non-original information sources including annotated photographs, images, graphs etc. are properly referenced in the text and figures and at the end of the report with a fully detailed list of references. The Harvard referencing system is recommended as it has been adopted by the University. See http://www.citethemrightonline.com/ Please read the following notes regarding the electronic submission via Canvas Electronic submission via Canvas (Turnitin) The following statements (a) to (d) must be read. They are from the agreed policy on electronic submission. a) Plagiarism: Notwithstanding that your lecturer may have compelled you to use electronic submission, by submitting your work via Canvas this way, you are deemed to be acknowledging that the work is your own. You are also acknowledging that we may use plagiarism software to check your work. If you do not wish us to check your work in this way you must still submit your work but also include in the submission text box a clear statement such as: “I do not want this work submitted for plagiarism checks to separate plagiarism checking software.” All work submitted electronically for this assignment will be scanned/stored automatically by the Turnitin web-search database plagiarism detection system. Please be assured that if this detects any potential plagiarism issues, we will discuss these fully with you prior to deciding what action, if any, to take. If you DO NOT wish your work submitted for this assignment to be scanned/stored automatically by the Turnitin websearch database plagiarism detection system, you must submit your reasons in writing to Dr C B Ponton on th
[email protected] by 17:00 on Monday 8 February 2016. You will be expected to put forward a principled objection to its use if you do this. You may not simply withhold consent for no reason. b) Print receipt: For paper-based coursework submission you are given the white sheet as receipt for your work. The purpose of e-submission is to minimise paperwork. Nevertheless in the unlikely event that a piece of your work in electronic form is mislaid it is essential that you keep a paper record of the submission. Therefore you must print out the page indicating successful submission as a receipt and keep it for your records. After you have submitted your assignment, you should be able to view a confirmation that you submitted your assignment. Thus, it is your responsibility to ensure that you have successfully submitted your coursework assignment to Canvas. If you do not see an immediate onscreen confirmation that you have successfully submitted your assignment to Canvas, then as soon as possible, either:
3
(i) ideally the same day, otherwise the next day when submitting before the submission deadline day, OR (ii) ideally the same day, but definitely the next day when submitting on the submission deadline day, ask Sharon in the UG Office to check if Canvas has accepted the submission (or when Sharon is not available in person to ask, email Sharon and/or the lecturer who has set the Canvas coursework assignment asking them to check). c) Procedure for Canvas downtime: As with all computer-based work you must assume that the Canvas system will crash during the period immediately before the submission deadline. If despite your best efforts to submit early you fall foul of this you must send an email to your lecturer alerting him or her to what has happened and seeking advice. If the downtime is extensive and continues beyond the deadline you will be informed of the decision taken about extension. You should not submit your work by email unless specifically instructed to do so. If Canvas goes down when you attempt to submit your coursework assignment, then as soon as possible, either: (i) ideally the same day, otherwise the next day when submitting before the submission deadline day, OR (ii) ideally the same day, but definitely the next day when submitting on the submission deadline day, see Sharon in the UG Office to explain that you have been unable to electronically submit your coursework assignment and ask what you should now do (or when Sharon is not available in person to ask, email Sharon and/or the lecturer who has set the Canvas coursework assignment explaining that you have been unable to electronically submit your coursework assignment and asking what you should now do). d) Check correct file: You must check extremely carefully that the work submitted is the work that you intended to submit. 5% of the full marks will be deducted for EACH working day of lateness (i.e. excluding Saturday, Sunday, Bank Holiday and University closed periods), until ZERO (0%) is reached. By submitting you accept that if subsequently you realise that the wrong piece of work was submitted then the above normal penalties for lateness will apply, however innocent the mistake.
4
Control of Microstructure (MT 3COMa) Continuous Assessment Assignment Questions 2015 (a)
For grain boundary diffusion during sintering, the constant C, in
h 1 $& 2 6 #2" 4 6 2 6 ') = C "a "t = ( a 4%
1 $& 13 #4 3 1 3 ') C "a "t ( 4%
(1)
48Dg "Vm# (2) RT ! Define and explain, clearly and concisely, the ten parameters in both equation (1) and (2). is
!
C=
[10 marks]
(b) Explain clearly and concisely, show graphically, and then compare (i) the temperature dependence of Dg and (ii) the rate of change of Dg with sintering temperature. [10 marks] (c) On the basis of what you have learnt in your 3COMa lectures and associated self-study/learning, discuss and explain clearly and concisely why, for a given green body density, initial particle size, and sintering time, the degree of densification increases with increased sintering temperature, by considering for a fixed initial particle size a and fixed sintering time t, how the particle interpenetration rate, d(h/a)/dt increases with increased sintering temperature. [10 marks]
(d) Thus, using relevant and real numerical data for the parameters in equations (1) and (2), for a given powdered material (ceramic, glass, or metal) of your choice, show quantitatively and hence graphically, how, for a given green body density, initial particle size, and sintering time, the degree of densification d(h/a)/dt increases with increased sintering temperature. Real numerical data for your chosen powdered material is to be found by researching the relevant published scientific literature etc. [10 marks]
(e) In the latter stages of sintering, grain growth can become dominant. Explain clearly and concisely, the influence of pores on grain growth, comparing and contrasting their behaviour with that of solid inclusions in relation to grain boundary mobility. [10 marks]
5
Marking Criteria The following features form the underlying basis of the marking criteria that will be used when marking your answers. 1. All questions and sub-questions answered. 2. All page layout, line-spacing and font instructions followed. 3. Clear structure and layout of answers to each question and sub-question. 4. Figures with Figure Numbers plus Captions and References below the Figures. 5. Tables with Table Headings Above Table and Table References below the Tables. 6. Use of relevant and consistent numerical property data, presented in tables and graphs as appropriate, e.g. when considering more than two data values. 7. Good use of appropriately labelled, clear diagrams to assist your explanations. 8. Inclusion of relevant scientific laws, principles, models, and/or equations describing relevant material and/or structure behaviours. 9. Clear, concise and correct explanations, without any waffling and needless repetition, i.e. make sure you understand all that you plan to say before writing a word! 10. Statements made that are correct and can be justified. 11. No contradictory statements. 12. Proper use of Harvard (preferred) referencing system, or Vancouver referencing system, including page numbers etc. 13. Use of appropriate and sufficient references, i.e. information sources to support your answers. 14. Inclusion of not just Web-based references. 15. Reference details complete and correct.
6
