ss_3 - ’!__——4 3.19. Draw a BCC unit cell. List the...

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Unformatted text preview: ’!__——4 3.19. Draw a BCC unit cell. List the atom positions for the eight comer atoms and one body- centered atom; Consider a unit cell offset from this first cell by three cells in [100], 2 cells in [010], and 4 cells in [001]. What are the atomic coordinales of the body-centered atom in this second unit cell? coil «xi 3 .20. A. Draw an FCC unit cell. Using another diagram to identify: B. the (121) plane. C. the [121] direction D. the (1,2,1) position. E. Suppose the material in question is FCC Ni with a lattice parameter of W 0.3 542 nm, estimate the atomic radius of a nickel atom. QOD‘ F. The atomic weight of Ni is 53.70 g/mole. Use the unit-cell information above “T to estimate its density. 4. 4. Is the giass transition temperature for a piece of window glass above or below room temperature? Why? T Lemma GLMS e. M hm. } . NR5 was; %%WS Maw: mute; Racism“) k. N.) k L.\ 99‘ 4.8. (A) The viscosity of a 7740 silica-based glass (like Pyrex) is 1012 Pa—s at 600 OC and is 106 I’aus at 1000 0C. Using an Arrhenius model for the temperature-dependent viscosity, calculate the temperature at the glass strain point where the viscosity is 10‘” Pa-s. Ciearly show your work. - (B) Sketch qualitatively -— exact numbers are not required - the variation of viscosity as a function of temperature. EL _ E a 1 f T “rbe— WEWR erg’ EML '9”? v; flé‘i’xTC‘Q .3, 3U.®\2\= thbt qu @ ...
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ss_3 - ’!__——4 3.19. Draw a BCC unit cell. List the...

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