MSE 360 Exam3 Practice sol-ALL ANSWERS CORRECT-GRADED A-DOWNLOAD TO SCORE HIGHLY

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Materials Science and Engineering Department MSE 360, Test #3 ID number _______________________________ Name: _____________________________________ No notes, books, or information stored in calcula... tor memories may be used. Cheating will be punished severely. All of your work must be written on these pages and turned in. Constants, equations, and other data are given on the last page of the exam. _______________________________________________________________________________ Problem 1-18: 2 points each (Key:1C2B3B4B5A6D 7B8D9B10B11A12A 13A14A15A16B17A18A) 1. A regular solution will likely form an ordered atomic structure if: d.) Ω = 0 b.) Ω > 0 c.) √Ω < 0 2. With increasing temperature and constant pressure, the Gibbs free energy of a single phase A) increase, B) √decrease 3. During annealing, the grain #2 represented in the right figure will A) be stable B) √grow C) shrink 4. The mechanism of diffusion for a dilute solute atom of small atomic radius compared to the host material would be best described by: a.) Substitutional diffusion b.) √Interstitial diffusion c.) Vacancy diffusion d.) all of the above 5. When Lf/Tm > 4R, where the Lf is the latent heat of fusion, Tm is the melting temperature, the liquid/solid interface is A) √Smooth, B) Rough 6. The inhomogeneous nucleation is easier than the homogeneous nucleation because the inhomogeneous nucleation A.Has a critical nucleus with smaller diameter B.Has a critical nucleus with smaller volume C.Has a critical nucleus with smaller critical Gibbs free energy D.√Both B and C 7. For heterogeneous nucleation in the grain interior, grain boundaries, grain edges and grain corners, their critical energy barriers can be described as A. Grain boundaries > Grain edges > Grain corners > Grain interior B. √Grain interior > Grain boundaries > Grain edges > Grain corners C. Grain corners > Grain edges > Grain boundaries > Grain interior D. Grain boundaries > Grain edges > Grain corners > Grain interior 8. Dislocation can help with the nucleation of a new phase by A. Reducing nucleation energy barrier B. Increasing diffusion rat [Show More]

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