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Engineering MaterialsDescribe the three main types of metallic crystal structures (BCC, FCC, HCP) with their coordination numbers and packing factors.20257mEngineering MaterialsDeduce the packing fraction of BCC and FCC crystal structure with a neat sketch.20247mEngineering MaterialsChoose the correct option: Which factor most strongly governs whether a substitutional solid solution forms between metals A and B? (i) Large electronegativity difference between A and B (ii) Similar atomic radii and crystal structures with high mutual solubility (iii) Presence of small interstitial atoms like C or N (iv) High melting point of the solvent metal alone20252mEngineering MaterialsChoose the correct option: Which of the following is the hardest? (i) Austenite (ii) Bainite (iii) Pearlite (iv) Martensite20242m