Intro to Materials Science & Engineering

Professor Estrada ENGR 245: Intro to Materials Science & Engineering February 3, 2016 In order to receive full credit, all work MUST be shown and appropriate units must be specied. Working together is encouraged, however, all work that you turn in must be YOUR OWN work. Exercise 1. Given: En = ??A r + B rn Plot the En vs r for the following pair of ions up to 1 nm Pair 1: A = 2:34 eV-nm, B = 3:34 10??4 eV-nm8, n = 8 Pair 2: A = 1:436 eV-nm and B = 3:34 10??4 eV-nm9, n = 9 Exercise 2. On the basis of your plot in exercise 1, determine which bonding curve would likely be associated with the material that has the higher melting temperature. Exercise 3. Show that the ideal c/a ratio is 1.633 for a HCP lattice, and that the APF is equal to that of the FCC crystal structure. 1