Chap10_4pgs - 50lid andhose $olutiott$ Equilihrium P lo'23...

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50lid $olutiott$ and Phose Equilihrium lo'23 suppose I atvo of-the following elements is added to copper (forming a separate alloy with each element) without exceeding the solubility ti*it. wrri"r, one would bc expected to give thetrighel fenglh alloy? Is any of the ailoying erements expected to have unlimited solid solubility in copper? , (a) Au (b) Mn (c) Sr (d) Si (e) Co Solutlon: For copper: r.u= I.279 A, Mn; r: l.l2 rcu Ar : - 12.4% Different structure Highest Strength Different structure The Cu-Sr alloy would be expected to b strongest (largest size difference). The Cu-Au alloy satisfies Hume-Rothery's conditions unO might be expected to display complete solid solubility-in fact it freezes like an isomorphous scries of alloys, but a number of solid-state transformations occur at lower temperatulcs. lo-29 Determine thc liquidus tempcrature, solidus tcmperaturc, and freezing range for the following NiO-MgO ceramic compositions. [Scl figure l0_9(b).] (a) Au: r - 1.442 : rAu fcu (c) Sr: r = 2.l1l *6g.3%o (d)Si: r:1.176 Ar: -g.OVo Co: r 1.253 : -2.0Vo Solubility (a) NiO-30 mol%o MgO (c) NiO-60 molVo MgO Solution: (a) Tr: 2330"C (b) NiO-45 mot%o MgO (d) NiO-85 mot%o 7s 2150"C (b) Tr: 2460"C 7i 225OC (c) Tr: 2570'C 4 2380.C (d) Tt = 2720C ?i - 26l0oc FR 180"C 210"C 190"C
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Chap10_4pgs - 50lid andhose $olutiott$ Equilihrium P lo'23...

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