Lecture08 - ME 382 Lecture 08 STRUCTURES OF SOLUTIONS AND...

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ME 382 Lecture 08 24/ix/10 1 S TRUCTURES OF SOLUTIONS AND COMPOUNDS Few elements used in pure state (usually alloyed) E.g. Steel (Fe & C), 2xxx Al (Al +4%Cu+Mg, Si, Mn) Titanium (Ti-6%Al-4%V) Brass (Cu = 20% Zn) Bronze (Cu + 10-30%Sn) Solid solutions Alloy element (or ‘solute’) “dissolves” in ‘solvent’ element Wide range of solubilities (<0.01% to 100%) Fe can only dissolve 0.007 wt% C Sn can dissolve only 0.3 wt% Pb at room temperature 2.5wt% at 183 ° C Pb can dissolve 2wt% Sn at room temperature 19wt% at 183 ° C Cu and Ni are completely soluble in each other Two ways for atoms to dissolve: Interstitial solid solutions (if solute has small atoms such as C, B, N) E.g. , C in Fe Substitutional solid solutions E.g., Cu Sn If there is an excess of alloying element - a precipitate is formed E.g. , sugar in water, or moisture in air) The precipitates may be a saturated solid solution of host in alloy element E.g. Dissolve more than 2% Sn in Pb at room temperature
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Lecture08 - ME 382 Lecture 08 STRUCTURES OF SOLUTIONS AND...

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