MindTap Engineering for Askeland/Wright's The Science and Engineering of Materials, 7th Edition, [Instant Access], 2 terms (12 months)
7th Edition
ISBN: 9781305111219
Author: Donald R. Askeland; Wendelin J. Wright
Publisher: Cengage Learning US
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Chapter 4, Problem 4.62P
Calculate the angle
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Consider an aluminum polycrystal with a grain size of 10 μm. If a dislocationsource at the center of a grain emits dislocations under an appliedshear stress of 50 MPa that pile up at the grain boundaries, what is the stressexperienced by a grain boundary? Take G = 26 GPa and b = 0.3 nm.
The following figure displays both an Edge Dislocation and a Screw Dislocation. Answer the
following questions regarding the characteristics of each Dislocation
Edge dislocation
Screw dislocation
The crystal shown in below figure contains two dislocations A and B. If a shear stress isapplied to the crystal as shown, what will happen to dislocations A and B? Demonstratewith proper illustration.
Chapter 4 Solutions
MindTap Engineering for Askeland/Wright's The Science and Engineering of Materials, 7th Edition, [Instant Access], 2 terms (12 months)
Ch. 4 - Gold has 5.82108vacancies/cm3 at equilibrium at...Ch. 4 - Prob. 4.2PCh. 4 - Calculate the number of vacancies per cm3 expected...Ch. 4 - Prob. 4.4PCh. 4 - Prob. 4.5PCh. 4 - Prob. 4.6PCh. 4 - Prob. 4.7PCh. 4 - Prob. 4.8PCh. 4 - Prob. 4.9PCh. 4 - Au and Ag form a substitutional solid solution....
Ch. 4 - Prob. 4.11PCh. 4 - Prob. 4.12PCh. 4 - Prob. 4.13PCh. 4 - Prob. 4.14PCh. 4 - Prob. 4.15PCh. 4 - Prob. 4.16PCh. 4 - Prob. 4.17PCh. 4 - Prob. 4.18PCh. 4 - Write down the defect chemistry equation for...Ch. 4 - Prob. 4.20PCh. 4 - What is the Burger’s vector orientation...Ch. 4 - What is slip system and what role does it play in...Ch. 4 - Draw a Burgers circuit around the dislocation...Ch. 4 - What are the Miller indices of the slip...Ch. 4 - Prob. 4.25PCh. 4 - Prob. 4.26PCh. 4 - Calculate the length of the Burgers vector in the...Ch. 4 - Prob. 4.28PCh. 4 - Prob. 4.29PCh. 4 - The crystal shown in Figure 4-19 contains two...Ch. 4 - Prob. 4.31PCh. 4 - Prob. 4.32PCh. 4 - Prob. 4.33PCh. 4 - Prob. 4.34PCh. 4 - Prob. 4.35PCh. 4 - Prob. 4.36PCh. 4 - Prob. 4.37PCh. 4 - Prob. 4.38PCh. 4 - Prob. 4.39PCh. 4 - Prob. 4.40PCh. 4 - Prob. 4.41PCh. 4 - Prob. 4.42PCh. 4 - Prob. 4.43PCh. 4 - Prob. 4.44PCh. 4 - Why is it that single crystal and polycryst alline...Ch. 4 - Prob. 4.46PCh. 4 - Prob. 4.47PCh. 4 - Prob. 4.48PCh. 4 - Prob. 4.49PCh. 4 - Prob. 4.50PCh. 4 - Prob. 4.51PCh. 4 - Prob. 4.52PCh. 4 - Prob. 4.53PCh. 4 - Prob. 4.54PCh. 4 - Prob. 4.55PCh. 4 - Prob. 4.56PCh. 4 - Prob. 4.57PCh. 4 - Prob. 4.58PCh. 4 - Determine the ASTM grain size number for the...Ch. 4 - Certain ceramics with special dielectric...Ch. 4 - Prob. 4.61PCh. 4 - Calculate the angle of a smalla ngle grain...Ch. 4 - For BCC iron, calculate the average distance...Ch. 4 - Every time we alloy a metal, it gets stronger. Is...Ch. 4 - Prob. 4.65PCh. 4 - Prob. 4.66PCh. 4 - Prob. 4.67PCh. 4 - Prob. 4.68PCh. 4 - Prob. 4.69PCh. 4 - Prob. 4.70PCh. 4 - Prob. 4.71PCh. 4 - Prob. 4.72PCh. 4 - Prob. 4.73PCh. 4 - Prob. 4.74PCh. 4 - Prob. 4.75DPCh. 4 - You would like a metal plate with good...Ch. 4 - Prob. 4.77DPCh. 4 - Temperature dependence of vacancy conc enlralwns....Ch. 4 - Prob. 4.79CPCh. 4 - Prob. 4.80CPCh. 4 - Describe the problems associated with metal...Ch. 4 - Prob. 4.2KP
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- In figure 2 there is no chance for dislocation Is the strength in this case high and the ductility low?arrow_forwarddislocation theory in following figures calculate applied Force from dislocation A(b) to dislocation B(b') using relation Peach-Koehler الف( la B (b') | A (b) F, (5 B (b') b' A (b)arrow_forwardWHAT is meant by dislocation? State different types of dislocation with neat sketches .arrow_forward
- (3) The Burgers vector of a dislocation is 0.25 nm in a crystal. The shear modulus G = 40 GPa. Estimate the dislocation energy per unit length in this crystal.arrow_forwardQ-1) Suppose you would like to introduce an interstitial or large substitutional atom into the crystal near a dislocation. Would the atom fit more easily above or below the dislocation line shown in Figure? Explain. Shear stressarrow_forwardPlease show how the value of b was calculated Calculate the dislocation density in tungsten if the stress is controlled by the stress necessary to operate a Frank-Read source. The stress in the plane is 31 Mpa. Take G = 275 Gpaarrow_forward
- 6. Sketch how two edge dislocations of opposite sign on the same slip plane can anihilate each other C. two screw dislocations of opposite sign also annihilate each other?arrow_forwardCalculate the dislocation density in tungsten if the stress is controlled by the stress necessary to operate a Frank-Read source. The stress in the plane is 31 Mpa. Take G = 275 Gpaarrow_forward2. Sketch: a. 3 stages of single crystal stress-strain curve under uniaxial stress b. Frank-Reed mechanism for dislocation multiplication.arrow_forward
- Dislocation movement is hindered by: (This question has more than one correct answer) a. Increase in impurity atom concentration b. Reduced grain size c. High angles of misalignment between grains d. Plastic deformation during loadingarrow_forwardExplain the following, using dislocation theory: metal strengthening by: (a) grain size (b) solid solution strengthening (c) strain hardening (d) quenching in cold water following heating close to melting pt ( hint: Nv = Nexp(-Qv/kT)arrow_forwardFind the Miller indices of the plane shown below. (Show all steps and working). Use the correct type of bracket and bar notation for negative indices B 1/4 a C b Chkarrow_forward
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Dislocations and Plastic Deformation; Author: LearnChemE;https://www.youtube.com/watch?v=cpvTwYAUeA8;License: Standard Youtube License