MSE 2090 Section 2-3 Final Exam: Phase Diagrams, Phase Transformations, Polymers, Comprehensive, (BURNS: Corrosion)

MSE 2090 Section 2-3 Final Exam: Phase Diagrams, Phase Transformations, Polymers, Comprehensive, (BURNS: Corrosion) 180 minutes 350 points Name: (also write your last name on top of every page) Pledge: Useful constants: k = 8.62x10-5 eV/atom-K = 1.38x10-23 J/atom-K Na = 6.02x1023 atoms/mole R = 8.31 J/mole-K 1 eV = 1.6 x 10-19 J Charge of one electron = 1.6 x 10-19 C QUICK FACTS (8 Points Each; 200 Total Points): Multichoice – Circle EACH correct answer; there can be between 1 and 4 correct answers for each problem. Matching – use each choice once. 1. Which of the following is a single phase? a. A solid solution of Cu and Ni b. Martensite c. A mixture of solid Si and liquid Si d. A lead-tin eutectic structure 2. Pure Fe is found to form in α, β, δ, and γ solids depending on temperature and pressure. These forms can be referred to as: a. Phases b. Isomers c. Isotopes d. Allotropes 3. Two elements exhibit an isomorphous binary phase diagram (i.e., complete solid solubility). Which of the following MUST be TRUE? a. The elements form intermetallic compounds b. The elements have the same crystal structure c. The elements have similar electronegativities d. There are no two phase regions on the phase diagram. 4. An equilibrium solid phase is a part of a material system volume that has: a. No grain boundaries b. A composition that will not change as the temperature and pressure of the system are varied c. A uniform composition for a given set of temperature and pressure conditions d. Uniform physical characteristics (i.e. crystal structure) 5. Match each to its definition: a. 3 Eutectic b. 1 Eutectoid c. 2 Peritectic d. 4 Peritectoid 6. During solidification, a large undercooling: a. Decreases