Materials Engineering 4. You are specifying materials for some extremely small antenna components. They need to be joined together after fabrication and diffusion bonding has been chosen to do this. One of the parts is made of Beryllium. The other part can only be made from Lithium or Manganese. Which of these metals will have better solid solution solubility in Be and therefore will diffusion bond well to the Be? (4) (show your work!) 5. If a surface coating on a metal part is 0.00014 mm in length, what is the minimum magnification required for you to be able to see the coating in a sectioned mounted specimen? (6) a. 40x b. 25x c. 400x d. 250x e. 4000x f. 2500x 6. Which of the following signals do not provide information about the composition or structure of a sample? (5) A. Secondary electrons D. Phonons G. Bremstrahlung X-rays B. Backscatter electrons E. Characteristic x-rays C. Auger electrons F. Plasmons 7. Which product of electron/solid interactions will tell you the chemical composition of only the top few layers of atoms on a surface? (5) A. Secondary electrons B. Backscatter electrons C. Auger electrons D. Phonon E. Characteristic x-rays F. Plasmon G. None of these