CBE30361 Lecture 18: Materials Lecture 18
21 Mar 2016
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Solution -- solid, liquid, or gas solutions, single phase. Solubility limit -- the maximum amount (concentration) of a solute that can be dissolved in the solvent. (single phase. Insoluble e. g. , water and oil e. g. , alcohol and water, cu and ni e. g. , sugar and water, c and fe. Components -- elements or compounds present in the alloy e. g. , fe and c in carbon steel, h2o and nacl in salt solution. A binary alloy has two components, a ternary alloy -- three, etc. Phases -- the physically and chemically distinct material regions e. g. , (cid:2009) and (cid:2010) phase in al-cu alloy. Indicates all the equilibrium phases as a function of temperature (t), pressure (p) and composition (c). Independent variables: t and c (p = 1 atm. ) Complete solubility of one component in another (both the liquid and solid phases) (cid:1849)(cid:3013)+(cid:1849)(cid:3080)=1. Equilibrium (very slow) cooling (cid:1827) (cid:1828) (cid:1829) (cid:1830) (cid:1831) (cid:1829)(cid:3080) changes as we solidify. First (cid:2009) to solidify has (cid:1829)(cid:3080)=46 (cid:1875)(cid:1872)% (cid:1840)(cid:1861).
