Quiz 1 - soln2 - Metals and Alloys[26p0ints 2a The number...

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Unformatted text preview: Metals and Alloys [26p0ints] 2a.) The number density (1'. e. number of atoms per unit volume) for the FCC structure in terms of the lattice parameter a is: (circle one) i.) 1/a3 ii.) 2/a3 @ iv.) 8/a3 b.) Calculate the radius of an iridium atom, given that Ir has an FCC crystal structure, a density of 22.4g/cm3 and an atomic weight of 192.2g/mol. [O’Tlfllr 9Vc=nA1r \/c_Nm IONH V, 0:5 :7 ex = (an A1, “3 p NA ('= Ck F‘— J— (an AL, V3 : J— (( hklmt/all‘ (WW-‘2 3AM ,0 N. N3. (214. 31m1m‘78-"fii'i9fivwml ’ Answero'ras'w" . . u.- — c.) Metals such as iridium having an FCC crystal structure ideally have an ABCABC stacking sequence of close packed atomic planes. Identify the planar defect type represented by the following stacking sequences: / ABCABACBA Planar defect type ..... lwm. . . ...( remel. g in“) ”7ml ABCACABC Planar defect type...$f.‘59l5m3 fill...(!¥"5"“j 3 WM) Write down the stacking sequence expected for a metal having the HCP crystal structure. Stacking sequence ......... A6 .k g .5?) ................. ...
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