need it fast The lead-tin (Pb-Sn) is an eutectic type of phase diagram. At 183 °C, liquid (61.9 wt.% Sn), solid tin (97.8 wt.% Sn) and solidlead (18.3 wt.% Sn) are in equilibrium. Consider a tin wire being welded to a lead substrate. Just at the weld interface, themicrostructure shows 2.4% of a eutectic-like mixture in a Sn matrix. What composition (in terms of wt.% Sn) would youexpect to obtain at the weld interface provided you are looking at the interface at a temperature just below the eutectictemperature?Answer:

Answered: Image /qna-images/answer/c5e18e79-4cd4-4fae-bbce-98eb18870e44.jpg

Answered: The lead-tin (Pb-Sn) is an eutectic…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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QUESTION 2: Consider 2 kg of a (30 wt % Sn – 70 wt % Pb) solder alloy. The phase diagram of the lead-tin alloy (Pb – Sn) is shown in the figure below. (a) Calculate the amount of each phase present in the alloy at 300 °C. (b) Calculate the amount of each phase present in the alloy at 150 °C. (c) Calculate the amount of each phase present in the alloy at 100 °C. 327°C 600 300 Liquid 500 232°C a + L 200 183°C B +L 400 18.3 61.9 97.8 300 100 a + B 200 |100 40 60 80 100 (Pb) Composition (wt% Sn) (Sn) Temperature (°C) 20 Temperature ("F)
1 Plastic Deformation Occurs Through Dislocation Motion... ...so in order to make a material stronger, we should prevent dislocations from moving. For each of the following alloys, identify the strengthening mechanism and explain how it impedes dislocation motion: A. An aluminum alloy "inoculated" with TiB2 during solidification, producing a large number of small grains. B. Monel, a corrosion-resistant solid solution of Ni and Cu. C. An aluminum-lithium aerospace alloy containing precipitates of Al3Li. D. Wrought iron, which is often worked into complex shapes such as railings or furniture.
Lead-Tin (Pb-Sn) alloys are used in soldering applications. Draw phase diagram and Distinguish between the micro-structure at composition of “Pb40%Sn” and “Pb80%Sn”.
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
Question-6. For solidification of a piece of FCC-metal at 860 °C. The melting point of the metal is 1260 °C. The latent heat of fusion and surface free energy are -2.16 x108 J/m³ and 0.126 J/m², respectively. If nucleation is homogeneous, answer the following questions: (a) Compute the critical radius r* in nm (b) Compute the activation free energy AG* in J (c) If the lattice parameter is 0.26 nm at the melting temperature, compute the number of atoms found in a nucleus of critical size (d) Compute the critical radius at the supercooling degree of 260 K.
According to Reference [1], alloys of nickel (Ni) and tungsten (W) are can form substitutional solid solutions up to approximately 11 at% W. Consider two different alloy compositions: Ni-5W (5 at% W) and Ni-10.5W (10.5 at% W). A. Which composition should be more ductile? B. Which composition should be stronger? C. Using the oy~ C¹/2 relationship from the lecture slides, how many times larger should the yield strength be for Ni-10.5W compared to Ni-5W? D. Where should the tungsten atoms sit relative to the dislocation on or opposite the side with the extra half-plane? You will need information from Appendixes of the textbook.
What is the critical value of G for the directional solidification of two Al-Cu alloys (one containing 3wt.%Cu, the other 5wt.%Cu) at a rate of 0.08 mm/s ? For these alloys, k=0.14, m=-2.6°C/wt% and D=3x10-5cm²/s.
5 During decommissioning work, in order to determine the number of radionuclides deposited in a section of iron pipe, you grind up a small section of the pipe into a fine powder to carry out a reaction at 400 0C. Preliminary analysis shows that the predominant iron species are FeO and Fe2O3 Is it safe to use an aluminum crucible for heating your sample? What about a graphite crucible? Provide a short but detailed explanation referencing Ellingham diagrams, calculating Gibbs Free Energy, as well as provide any relevant reactions.
2 By using the Iron - Carbon diagram that you have. Find 5 of the following. 1- Find the Eutectic, Eutectoid temperature of cast iron with 4.3% C 2- The microstructure of Cast iron with 3.5% C. 3- Find the melting point and microstructure of steel with 0.83% C 4- Define the temperature range for Acm temperature. 5- Find the AC3, Ac¡ temperature of steel with 0.45% C 6- The Liquid and Austinite percent with chemical composition for cast iron with 2.3% C at 1300°C
Q1/ In a homogeneous solidification process, assume molten metal solidifies into a spherical nucleus with a BCC structure. The given data are; lattice parameter (0.292 nm), the heat of fusion energy (1.85×10-9 J/m³), latent surface free energy (0.204 J/m²), critical radius (1-35 nm), equilibrium melting temperature (1516 K), and room temperature (27 °C). Calculate the following for this metal; (a) supercooling value temperature (b) activation tree energy (c) number of atoms in a nucleus of critical size.
During a quenching process on a TTT diagram, we can transform pearlite into bainite. True or false?
By using the Iron - Carbon diagram that you have. Find 5 of the following. 1- The microstructure of Cast iron with 3% C. 2- The Liquid and Austinite percent with chemical composition for cast iron with 2% C at 1300°C 3- Find the melting point and microstructure of steel with 0.83% C 4- Define the temperature range for Acm temperature. 5- Find the Ac3, Acl temperature and microstructure of steel with 0.4 % C 6- Find the Eutectic, Eutectoid temperature and microstructure of cast iron with 4.3% C

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