1 Plastic Deformation Occurs Through Dislocation Motion......so in order to make a material stronger, we should prevent dislocations from moving. For each of thefollowing 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 smallgrains.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.

Strengthening mechanisms in materials are designed to avoid dislocation motion, and also to enhance…

Answered: 1 Plastic Deformation Occurs Through…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

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In the present figure: compare between the alloy number 1 (0.4% C) and 2 (1.2% C) regarding: A. The expected mechanical properties of the two alloys (with explanation). B. .The range of applications for these alloys. C. The stages of annealing treatments Including: 1) Softening. 2) Spheroidizing. 3) Grain Size Reducing... 1 2 I p+ Fe,C a + p
With the aid of high resolution electron microscope, image of edge dislocation was observed in crystalline structure of metals .So the initiation of dislocations may be produced during the following processes dendritic growth. O Stress application. O Solidification process. O Alternate heating and cooling. O Cold-working. O
In the present figure: compare between the alloy number 1 (0.4% C) and 2 (1.2% C) regarding: A. The expected mechanical properties of the two alloys (with explanation). B. .The range of applications for these alloys. C. The stages of annealing treatments Including: 1) Softening. 2) Spheroidizing. 3) Grain Size Reducing.. 1 a + P P+ Fe,C
Define quenching. (a) What effects does it have on the microstructure? (b) How does this affect dislocation movement? (c) Why/how does this affect the properties?
Briefly describe how precipitation hardening happens in Al alloys (how the microstructure evolves as annealing time increases). Why it first forms q” then q’ before q is finally formed? How does the alloy’s strength change during this process? What are the strengthening mechanisms?
Identify the microstructures of each of expected to be found in each of these alloys 1095 furnace cooled from 1650 farenheight 1095 air cooled from 1650 farenheight 1095 water quenched from 1650 farenheight
2. (a) Nickel-based alloys are used for gas turbine blades in aerospace engines. Briefly discuss the characteristics that make these alloys the choice for this application. (b) Single-crystal technology is applied to nickel alloys that are used as gas turbine blades in aerospace engines. With the aid of sketches describe how a single-crystal casting can be manufactured and explain why a single-crystal casting is likely to have superior creep resistance than a directly-solidified one. (c) Demonstrate the application of the Ten-percent Rule by calculating the approximate tensile strength and elastic modulus in the 0˚ direction of a carbon-fibre reinforced polymer composite if the strength and elastic modulus in the 0˚ single ply are 3620 MPa and 143 GPa respectively. The lay-up sequence of the composite is [02/+45/-45/902]s.
Define annealing. (a) What effects does it have on the microstructure? (b) How does this affect dislocation movement? (c) Why/how does this affect the properties?
3. Why are dislocations not considered thermodynamic equilibrium defects like vacancies? Explain by describing the relative interplay between entropy and enthalpy affecting the Gibbs free energy of the dislocations-containing material system.
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”.
Which of the following alloys would form a complete substitutional solid solution? O Metal 1 is HCP, metal 2 is FCC, and atomic radius difference is less than 15%. O Metal 1 is BCC, metal 2 is BCC, and atomic radius difference is at least 15%. O Metal 1 is FCC, metal 2 is FCC, and atomic radius difference is 12%. O Metal 1 is BCC, metal 2 is FCC, and atomic radius difference is 12%. O Metal 1 is FCC, metal 2 is FCC, and atomic radius difference is 15%.
A 609 g eutectoid steel ( about 0.8%C) is heated to 1,002 C and cooled slowly through the eutectorid temperature. This results in the formation of cementite Fe3C (6.67%C) and ferrite (0.025%C). Calculate the number of grams of cementite that form in the steel.

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