Special Edition: Supercooled, Superheated & Supersaturated Supercooled – “supercooled fiji water freezing”. Googling words http://www.youtube.com/watch?v=lISK1YFcZBM Why did the water freeze by tapping on the bottle? Superheated – “superheated solution exploding” http://www.youtube.com/watch?v=2FcwRYfUBLM Why did the water explode in the microwave oven? Supersaturated – “supersaturated salt solution crystallizing youtube” http://www.youtube.com/watch?v=1y3bKIOkcmk Why did massive precipitation occur when a grain of sodium acetate was dropped? Supercooled Water Superheated Water Supersaturated Water 1

Activity 3 - Phase Characterization – 40% Sn, A Hypoeutectic Alloy (150C) Given temp. & nom. comp what are: 1. Phases Present 2. Each Phase Chemical Comp. 3. Each Phase Weight Fraction Given: 1) Temp 2) Nominal comp % Sn - % Pb Get: 1) Phases Present 2) Phases Chem. comp. 3) Phases Frac. Given 1) 150C; 2) 40Sn-60Pb (2-phase region) nominal composition 2

Activity 2 - Stress Strain Curve Example Calculation Determine the following quantities given below. Elastic modulus: E = _________ Yield Strength: YS 0.2%e = ________ Tensile Strength: TS = _________ Breaking Strength: BS = ________ Ductility % elongation %el = ________ Ductility % Reduct. Area: %RA = _______ x Afinal = 0.9 Aoriginal 3

Activity 2: Effect of Cold Work on YS, TS, & %el Reduce a Cu rod 0.40 in (10.2 mm) dia. to 0.35 in (8.9 mm). Determine YS, TS and ductility Cu Cold Work D f = 0.35 in D o = 0.40 in YS TS %el YS = ________ TS = ________ Ductility %el = ___ YS 4