4.23.52 x 1018cm-3= 3.52 x 1024m-3. 4.4(a) Pt is the only element that meets all of the criteria and thus forms a substitutional solid solution having complete solubility. (b) Ag, Al, Co, Cr, Fe, and Zn form substitutional solid solutions of incomplete solubility. All these metals have either BCC or HCP crystal structures, and/or the difference between their atomic radii and that for Ni are greater than ±15%, and/or have a valence different than 2+. (c) C, H, and O form interstitial solid solutions. These elements have atomic radii that are significantly smaller than the atomic radius of Ni. 4.9CFe=98.87% CC=0.19% CCr=0.94% 4.10The number of moles of Cu and Zn are 0.519 and 0.719 respectively. Thus, CCu=41.9 at% and CZn=58.1 at%.4.26 The Burgers vector and dislocation line are perpendicular for edge dislocations, parallel for screw dislocations, and neither perpendicular nor parallel for mixed dislocations. 12.30the number of lattice sites per cubic meter
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