a.) What type of binary phase diagram is Pb-Sn an example of?
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Q: The figure below shows Pb-Sn phase diagram. What is the composition of Pb and Sn at point 1? 1200…
A: Correct answer: c. 90 wt % Sn and 10 at % Pb.
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Q: Q3: A: 40 wt% Sn-60 wt% Pb alloy at 220°C, determine the phases present?
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Q: (a) What is the difference between the states of phase equilibrium and metastability?
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- The figure below shows Pb-Sn phase diagram. What is the composition of Pb and Sn at point 1? 1200 1000 Liquid a +L 779 C (Tg) B+L 6 800 8.0 71.9 G 91.2 600 400 200 20 40 60 80 100 (Pb) Composition (wt% Sni (Sn) Callister Jr., W.D., 2007 O a. 80 wt % Sn and 20 wt % Pb O b. 10 wt % Sn and 90 wt % Pb O c. 90 wt % Sn and 10 wt % Pb O d. 20 wt % Sn and 80 wt % Pb Temperature ("C)Figure 1 shows the Mg/Pb phase diagram. 700 L L 600 + M a + L Mg, Pb 500 465 400 L. Mg Pb 300 200 a + Mg Pb B+ Mg Pb 100 20 40 60 80 100 Mg Composition (wt% Pb) Pb Mg Pb Figure 1 The Mg/Pb phase diagram QUESTION 1-A Show on the diagram the following: 1. The Pb% to gain alpha grain with Mg.Pb on the boundary of alpha at the room temperature 2. Is it possible to gain beta grain with Mg.Pb on the boundary at the room temperature of an alloy? Explain 3. What is the mount of alpha in an alloy (50%Mg +50%Pb) at temperature of 500°C? 4. What is the mount of alpha in the alloy (50%Mg +50%Pb) at the room temperature? 5. What is Mg2Pb? Explain 6. If the requirement for an alloy to have 100 pph eutectic at the room temperature, what is the metal Pb percent? 7. Is it possible to have an alloy containing beta and alpha at the room temperature? Explain Temperature (°C)Using the following table, draw a melting point diagram and estimate the eutectic temperature and composition: Percent composition Melting point range (°C) 100% A 125-126 75% A-25% B 115-120 65% A- 35% B 128-131 50% A- 50% B 135-140 100% B 151-152 Can you suggest what additional points you need to give a more accurate measure of the eutectic point?
- 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% NiQ1 / 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 andThe composition of the liquid in an 29 wt% griffinium alloy at 898 degrees centigrade is (enter the wt% griffinium)
- Consider the Al-Li phase diagram below and answer the following questions. 800 Temperature (°C) 700 L 600 4 20.4 2 α 500 β 9.9 400 -Y 300 200 100 0 ΑΙ 20 40 60 α (Li)- 80 Li Weight percent lithium 1) What is the melting point of pure Al? (2 pts) 2) What is the approximate maximum solubility of Li in Al (a phase)? At what temperature that occurs? (6 pts) 3) The phase constitution and their weight fraction at the points i) 10.0 wt.% Li and 200°C, ii) 30 wt.% Li and 600°C. (12 pts) 4) Name the types of reactions that occur at the two circles locations, write down the phases involved before and after the reaction, and their relative weight fractions (if more than one phases) before and after the reactions. (13 pts) 5) For the 5 wt.% Li alloy, initial fully liquid, write down at what temperature phase boundaries are crossed and the reaction that happens at the boundaries when it is gradually cooled down to room temperature. (9 pts) 6) Draw the microstructure of the 5 wt.% Li alloy after…Describe experimental procedure to obtain a binary isomorphic phase diagram for metals A and B by stating the equipment and materials you need? Show typical micrographs at 3 different phase regions for the alloy 50% A and 50% B on the phase diagram you obtainedA binary alloy having 28 wt% Cu and balance Ag solidifies at 779°C. The solid consists of two phases a and B. Phase a has 9% Cu whereas phase ß has 8 % Ag at 779°C. At room temperature these are pure Ag and Cu respectively Sketch the phase diagram. Label all phases and temperatures. The melting points of copper and silver are 1083 and 9610 respectively s Pà) Estimate the amount of a and B in the above alloy at 779°C and at room temperature.) b) Calculate the mass fraction of phases for 40% Cu alloy at 300 °C and TR c) What is the composition of the alloys in (b)
- Referring to Figure 1, answer the following: What are the liquidus and solidus temperatures for an 80%Pb20%Tl alloy? What is the composition of the solid solution phase for the aforementioned alloy once we hit the liquidus temperature upon cooling? For the same alloy above, use the inverse lever rule to calculate the %solid and %liquid at 325CUsing the following information: ·A binary system of A and B metallic elements, which are partially soluble in the solid state. • Consider linear solidus, liquidus, solvus lines. • The melting point of element A is 1000 °C and the melting point of element B is 1250°C. • The system has a eutectic reaction which occurs at 750°C, at a composition of CE: 25 wt% A. · The solid solution formed in A rich region a; the maximum solid solubility of B in a is 7%wt at eutectic temperature and drops to 3%wt at room temperature. • The solid solution formed in B rich region is B; the maximum solid solubility of A in B is 5%wt at eutectic temperature and drops to 0%wt at room temperature. (d) Calculate the mass fractions of the two solids for the alloy with a composition of 50%wt A-50%wt B just below eutectic temperature.1) Given the following information construct a hypothetical phase diagram formetals A and B between the temperatures of 400 and 800 o C given the followinginformation The two end member components are A and B The bottom axis should given in mol% B with 100 mol% B being on the right sideof the diagram. The melting temperature of metal A is 750 o C. The melting temperature of metal B is 700 o C. One eutectic occurs at 600 o C and 75 mol% B. The maximum solubility of A in B is 15 mol% A, and occurs 600 o C.The maximum solubility of B in A is 10 mol% B and occurs 600 o C. 2) Label all regions on the phase diagram 3) Sketch representations of the equilibrium microstructures for the phase diagramabove, for an A-B alloy of the eutectic composition at 750 and 500 o C