Consider the Al-Li phase diagram below and answer the following questions.800Temperature (°C)700L6004 20.42α500β9.9400-Y3002001000ΑΙ204060α (Li)-80LiWeight percent lithium1) 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 temperaturethat 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 phasesinvolved before and after the reaction, and their relative weight fractions (if more than onephases) before and after the reactions. (13 pts)5) For the 5 wt.% Li alloy, initial fully liquid, write down at what temperature phaseboundaries are crossed and the reaction that happens at the boundaries when it is graduallycooled down to room temperature. (9 pts)6) Draw the microstructure of the 5 wt.% Li alloy after cooling to room temperature assumingan equilibrium transformation. Please mark the phase constitution of distinct domain in thedrawing. (3 pts)

Step 1: (1.)"Pure Al" refers to 100% Al.The provided diagram indicates that 650° C is the melting…

Answered: Consider the Al-Li phase diagram below…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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1 Al-Li Aerospace Alloys When a small amount of Li is added into Al to create an Al-Li alloy, the two elements typically do not mix homogeneously. Instead, most of the material is nearly-pure Al, while some small regions are Li-rich.¹ (These small regions are called precipitates and they are responsible for giving Al-Li alloys much better properties for aerospace applications relative to pure Al. We'll learn more about the alloying process and about precipitates later in the course.) The Li-rich regions have the chemical formula Al3Li and belong to the cubic crystal system.² In the unit cell, the Li atoms are located at 000, while the Al atoms are located at 110, 101, and 01121. (a) Draw the unit cell of Al3Li. (b) Which of the crystal structures from Callister Chapter 3 does this resemble? Why do we not call it that structure? (c) Given that the lattice parameter is 0.401 nm, what is the density of Al3Li?
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)
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A NIO-20 mol % Mgo ceramic is allowed to solidify. (See the figure below.) Temperature (°C) 2800 2600 2400- 2200 2000 L (Ni, Mg)0 40 60 80 MgO Mole percent MgO NIO 20 (a) Determine the composition (in mol% MgO) of the first solid to form. 80 x (b) Determine the composition (in mol% MgO) of the last liquid to solidify under equilibrium conditions. 35 X%
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For alloy of two hypothetical metals A and B, there exist an a, A-rich phase and a B, B-rich phase. For alloys of two different overall compositions at 25°C, the weight fractions of Wa and WB are listed in the table. Determine the solubility limits for both a and B phases at 25°C. Alloy Composition Wa WB 70wt% A-30wt% B 0.78 0.22 35wt% A-65wt% B 0.36 0.64
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?
Consider 1 kg of an Al-Si alloy with 20 wt % silicon. The sample is slowly cooled down from 900 oC to room temperature. The Al-Si phase diagram is given below. (a) What is the melting point of Al and Si? (b) Upon cooling, at what temperature will the first solid appear and what is the phase of the first solid, and what is the composition of the first solid? (c) At 600oC, what phases do you have and what is the mass of each phase? (d) At 578oC, what phases do you have and what is the mass of each phase?
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700 L 600 м a + L Mg, Pb 500 O 465 400 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 1. The Pb% to gain alpha grain with Mg2Pb on the boundary of alpha at the room temperature. ANSWER: From the diagram, the required Pb% is 40% since it corresponds to the boundary eutectic. 2. Is it possible to gain beta grain with Mg2Pb on the boundary at the room temperature of an alloy? Explain ANSWER: It is not possible to get grain on Mg2Pb since the eutectic composition will be varied, which in turn will lose the composition strength. 3. What is the mount of alpha in an alloy (50%Mg +50%Pb) at temperature of 500oC? ANSWER: The mount of alpha in the alloy 50% Mg + 50 % Pb at 500 C will correspond to the eutectic composition at the 70% of Pb, i.e; the mount = 70/100 = 0.7 % of Pb 4. What is the mount of alpha in the alloy (50%Mg +50%Pb) at the room temperature? ANSWER: The mount of alpha in the alloy 50% Mg + 50 % Pb at room…

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