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1.Final notes

1.Final notes - wt%Ni =(at%Ni x M Ni(at%Ni x M Ni(at%Cu x M...

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Sheet1 Page 1 Phase- Any portion of a system which is physically homogeneous within itself and can be mechanically separated Phases have the following characteristics: 1.Same structure or atomic arrangement throughout 2.Roughly same composition and properties throughout 3.Definite interface between the phase and any surrounding or adjoining phases Phase diagram (T Temperature y-axis, C % Composition or weight percent x-axis) Solubility- how much of each material or component we can combine without producing an additional phase Unlimited Solubility- regardless of the ratio, the two substances are soluble into each other Limited solubility- only a certain percentage will mix, the rest will be saturated [salt water] Binary- consisting of two To calculate weight percentage:
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Unformatted text preview: wt%Ni = [ ((at%Ni x M Ni)) / ((at%Ni x M Ni) + (at%Cu x M Cu)) ] x 100 Hume-Rothery rules -Conditions for Unlimited solubility 1.Size factor- atoms or ions must be similar in size, no more than 15% difference in atomic radius) in order to minimize lattice s 2. Crystal Structure-must have same crystal structure to avoid transition from one structure to another 3. Valence- ions must have the same valence, otherwise the configuration favors the formation of compounds and not solution s 4.Electronegativity- atoms must have similar electronegativities or else compounds will be favored over solutions Liquidus and Solidus Temperature- Temperature at which material is completely solid or liquid Freezing range = liquidus ‰ solidus temperature...
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