Old FINAL EXAM 2008 with solutions

Old FINAL EXAM 2008 - Answer Key FINAL EXAM Name ENME 382 Engineering Materials and Manufacturing Processes There are 15 questions on the exam

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
FINAL EXAM Name ________ Answer Key _____________ ENME 382 Engineering Materials and Manufacturing Processes May 19, 2008 There are 15 questions on the exam worth 150 pts. You have 120 minutes. Please place the answers in the spaces provided. Please sign the honor pledge on the last page. Questions 1-4 refer to the phase diagram below. 1. Below is a section of the A-rich side of a phase diagram between fictitious elements A and B. Identify the phases that are located in the regions marked W-Z. Note the phase regions already marked on the diagram are liquid L, solid α, the two-phase region of solid α + solid ζ, and the two-phase region of solid ζ + solid β . (8 pts) Region W:_____ α + L ________ Region X: ____ ζ ____________ Region Y: ____ ζ + L _________ Region Z: _____ β + L _________ α α + ζ L X W Y Z ζ + β Weight Percent B Æ A
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2. Please answer the following questions about the phase diagram on the previous page. (16 pts) a. ____D______ The isothermal reaction at 280°C can be described by which of the following: a) α + β Æ ζ b) α + L Æ β c) α + L Æ ζ d) L Æ ζ + β e) none of the above. b. _____C_____ The isothermal reaction at 280°C is named which of the following: a) peritectic, b) peritectoid c) eutectic d) eutectoid e) none of the above. c. _____C_____ The isothermal reaction at 280°C occurs at which of the following compositions (in weight percent B): a) 6.8%B, b) 12%B c) 29.3%B d) 40%B e) none of the above. d. _____C______ The isothermal reaction at 498°C can be described by which of the following: a) α + β Æ ζ b) α + L Æ β c) α + L Æ ζ d) L Æ ζ + β e) none of the above. e. _____A_____ The isothermal reaction at 498°C is named which of the following: a) peritectic, b) peritectoid c) eutectic d) eutectoid e) none of the above. f. _____B_____ The isothermal reaction at 498°C occurs at which of the following compositions (in weight percent B): a) 6.8%B, b) 12%B c) 29.3%B d) 40%B e) none of the above. g. _____A_____ The maximum solubility (in weight percent) of B in A is which of the following: a) 6.8%B b) 12%B c) 29.3%B d) 40%B e) none of the above
Background image of page 2
3. For a material with an overall composition of 10 weight % B in A at the temperature of 600°C, what would be the two phases present. What would be the composition and the amount of each of the two phases. (16 pts) Phase Composition (wt % B) Amount (wt % of phase) α 6% 67% L 18% 33% 4. ___ Nickel ____ Place in the space the name of the element in the list that would create an isomorphous phase diagram with copper? (4 pts) Element Atomic Radius (nm) Crystal Structure Electronegativity Valence Copper (Cu) 0.1278 FCC 1.9 +2 Iron (Fe) 01241 BCC 1.8 +2 Zinc (Zn) 0.1332 HCP 1.6 +2 Chromium (Cr) 0.1249 BCC 1.6 +3 Nickel (Ni) 0.1250 FCC 1.9 +2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
5. DIFFUSION (12 pts) For substitutional diffusion of zinc in copper, D o = 2.4 x 10 -5 cm 2 /s and E a = 1.96 eV.
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 08/02/2011 for the course ENMA 300 taught by Professor Alsheikhly during the Spring '11 term at University of Maryland Baltimore.

Page1 / 14

Old FINAL EXAM 2008 - Answer Key FINAL EXAM Name ENME 382 Engineering Materials and Manufacturing Processes There are 15 questions on the exam

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online