Temperature (°C) Based on the Ti-Al phase diagram (important for standard commercial alloy Ti-6Al- 4V) shown below, identify a) the type of reaction (e.g., peritectic) of the marked points (1) and b) list the phases before and after the reactions. 10 20 Weight percent aluminum 30 40 50 60 70 80 90 100 1800 1700 1670°C (1) 1600 L 1500 1400 a (ẞTi) 1300 1285 y-TiAl 1200 1100 1125 لسسسلسسسل 1000 Ti, Al (L10) 900 ር? 882°C 800 (aTi) (D019) 700 600 500 0 10 20 Ti Superlattice structures -TiAl, 665°C 660.452°C TiAl₂ aTiAl3 (Al). 20 30 40 50 60 70 80 90 100 Atomic percent aluminum PM Al

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For the alloy Mg-45 wt% alloy at 500 C, what is the weight percentage of Pb in the alpha phase?

Calculate the weight fraction for phases at point B? what are those phases? Is there any eutectic rection? How many phases are present in this diagram? Cu-Ni system T(°C) TA 1300 -L (liquid): A tie ļine liquidus L +a Тв EB solidus (solid) 1200 TD ID 20 3032 35: 4043 50 Ca wt% Ni

Q1 / Two metals Beryllium (Be) and Silicon (Si) have melting points 1282°C and 1414 °C respectively, are completely soluble as liquids but completely insoluble as solids . They form a eutectic at 1090°C containing 61 wt% Si -39wt% Be? Determine the following:- 1- Draw the thermal equilibrium phase diagram and identify all phases are present in diagram ,then sketches what happens in microstructure when the alloys containing , a- 10wt% Si, b-70wt%Si , solidify completely. 2- Determine the composition and the amount of each phase for the alloy which contain 15 wt% Si-85wt% Be at 1150°C If the alloy is hypoeutectic determine the amount of eutectic at 600 °C? or hypereutectic and

For the given Ti-Cu phase diagram, specify all temperature-composition points at which eutectics, eutectoids, peritectic, and congruent phase transformations occur. Also, for each, write the reaction upon cooling. Temperature (°C) 1700 1500 1300 1100 900 700 500 0 (Ti) 1 B a 20 Ti₂Cu 40 Composition (wt% Cu) L TiCu TigCu4 60

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iii) For a 68 wt% Zn-32 wt% Cu alloy, make schematic sketches of the microstructure that would be observed for conditions of very slow cooling at the following temperatures: 1000°C, 760°C, 600°C and 400°C. Label all phases and indicate their approximate compositions. Comportion a In 20 40 60 100 1200 |2200 H2000 Liquid 1000 - 1800 デ+ダ H1600 J400 E 1200 600 400 『+キ 600 200 400 40 60 Conpositon tet% Zro

For 40 wt% Sn – 60 wt% Pb alloy at 150 oC (at point B) as shown in Figure, i. State the name of phase(s) present. ii. Calculate the composition(s) of the phase(s) present. 600 300 Liquid 500 a+L 200 400 300 100 200 100 20 60 100 (Pb) (Sn) Composition (wt % Sn) Temperature ("C) Temperature ("F)

Use the Lead-Tin (Pb-Sn) phase diagram below to answer the following questions: Place the following microstructures in the correct order of formation for slowly cooling a 98 wt% Sn alloy from 300 °C to room temperature (point A to point B).