EBK MANUFACTURING ENGINEERING & TECHNOL
7th Edition
ISBN: 8220100793431
Author: KALPAKJIAN
Publisher: PEARSON
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Chapter 1, Problem 29QLP
Explain why the strength of a polycrystalline metal at room temperature decreases as its grain size increases.
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Explain the differences in grain structure for a metal that has been cold worked and one that has been cold worked and then recrystallized.
3) The strength of a titanium piece is found to be 65,000 psi when the grain size is 17 x10-6
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9-
(a)
Constants in the Hall-Petch equation
Strength of this titanium piece when the grain size is reduced to 0.2 x10 m.
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Do noncrystalline or amorphous materials have grain boundaries? Why or why not?
Chapter 1 Solutions
EBK MANUFACTURING ENGINEERING & TECHNOL
Ch. 1 - What is the difference between an atom and a...Ch. 1 - Prob. 2RQCh. 1 - Prob. 3RQCh. 1 - Prob. 4RQCh. 1 - Define anisotropy. What is its significance?Ch. 1 - What effects does recrystallization have on the...Ch. 1 - What is strain hardening, and what effects does it...Ch. 1 - Explain what is meant by structure-sensitive and...Ch. 1 - Prob. 9RQCh. 1 - What influence does grain size have on the...
Ch. 1 - What is the relationship between the nucleation...Ch. 1 - What is a slip system, and what is its...Ch. 1 - Explain the difference between recovery and...Ch. 1 - What is hot shortness, and what is its...Ch. 1 - Explain the advantages and limitations of cold,...Ch. 1 - Describe what the orange peel effect is. Explain...Ch. 1 - Some metals, such as lead, do not become stronger...Ch. 1 - Describe the difference between preferred...Ch. 1 - Differentiate between stress relaxation and stress...Ch. 1 - What is twinning? How does it differ from slip?Ch. 1 - Prob. 21QLPCh. 1 - What is the significance of the fact that some...Ch. 1 - Is it possible for two pieces of the same metal to...Ch. 1 - Prob. 24QLPCh. 1 - A cold-worked piece of metal has been...Ch. 1 - What materials and structures can you think of...Ch. 1 - Two parts have been made of the same material, but...Ch. 1 - Do you think it might be important to know whether...Ch. 1 - Explain why the strength of a polycrystalline...Ch. 1 - Describe the technique you would use to reduce the...Ch. 1 - What is the significance of the fact that such...Ch. 1 - Prob. 32QLPCh. 1 - It has been noted that the more a metal has been...Ch. 1 - Is it possible to cold work a metal at...Ch. 1 - Comment on your observations regarding Fig. 1.14.Ch. 1 - Is it possible for a metal to be completely...Ch. 1 - Prob. 37QTPCh. 1 - Prob. 38QTPCh. 1 - Plot the data given in Table 1.1 in terms of...Ch. 1 - A strip of metal is reduced from 30 mm in...Ch. 1 - Prob. 41QTPCh. 1 - How many grains are there on the surface of the...Ch. 1 - Prob. 43QTPCh. 1 - Prob. 44QTPCh. 1 - Prob. 45QTPCh. 1 - A technician determines that the grain size of a...Ch. 1 - If the diameter of the aluminum atom is 0.28 nm,...Ch. 1 - The following data are obtained in tension tests...Ch. 1 - Prob. 50QTPCh. 1 - Prob. 51QTPCh. 1 - Prob. 52QTPCh. 1 - Same as Prob. 1.39, but ASTM no. versus...Ch. 1 - By stretching a thin strip of polished metal, as...Ch. 1 - Draw some analogies to mechanical fiberingfor...Ch. 1 - Draw some analogies to the phenomenon of hot...Ch. 1 - Take a deck of playing cards, place a rubber band...Ch. 1 - Give examples in which anisotropy is scale...Ch. 1 - The movement of an edge dislocation was described...
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- What is slip deformation? Why does it only occur in metal and not in ionic solids?arrow_forwardExplain why BCC (body-centered cubic) materials generally have higher mechanical strength values than FCC (face-centered cubic) materials in terms of (a) slip systems and (b) extended dislocations.arrow_forwardNote: Answer Should be not so long. Need straight forward Answer. For minimizing (1) dislocation creep and (ii) diffusion creep, state in each case whether a metal with a small grain size or a large grain size would be the most suitable, giving reasons for your answers.arrow_forward
- Consider a single crystal of some hypothetical metal that has the BCC crystal structure and is oriented such that a tensile stress is applied along a [2 2 1] direction. If slip occurs on a (2 1 1) plane and in a [-1 1 1] direction, compute the stress at which the crystal yields if its critical resolved shear stress is 2.4 MPa.arrow_forwardWhen the metal is cooled in a molten state, a grain boundary is generated. Figure out the process of forming a grain boundary, and explain the characteristics of the grain boundary and its effect on electrical/thermal properties.arrow_forwardA single crystal of a metal that has the FCC crystal structure is oriented such that a tensile stress is applied parallel to the [100] direction. If the critical resolved shear stress for this material is 1.18 MPa, calculate the magnitude of applied stress necessary to cause slip to occur on the (111) plane in the [1-10] direction.arrow_forward
- Metals and their alloys possess crystalline structures that may be altered to change their mechanical properties. Illustrate, with the aid of a diagram, substitutional ANDarrow_forwardDoes strain hardening aluminium increases the strength by reducing the number of dislocations? Why ?arrow_forwardWhich can cross-slip––an edge dislocation, a screw dislocation, or a mixed dislocation? Why?arrow_forward
- Calculate the dislocation spacing in a symmetrical tilt boundary (θ = 0.5◦) in a copper crystal.arrow_forwardList and briefly describe the four major creep deformation mechanisms active in crystalline materials.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_forward
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