Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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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
m and 82,000 psi when the grain size is 0.8 x10 m. What would be the
9-
(a)
Constants in the Hall-Petch equation
Strength of this titanium piece when the grain size is reduced to 0.2 x10 m.
(9)
Do noncrystalline or amorphous materials have grain boundaries? Why or why not?
Chapter 1 Solutions
Manufacturing Engineering & Technology
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_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_forwardConsider 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_forward
- When 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_forwardDoes strain hardening aluminium increases the strength by reducing the number of dislocations? Why ?arrow_forward
- Which can cross-slip––an edge dislocation, a screw dislocation, or a mixed dislocation? Why?arrow_forwardCalculate 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_forwardDiscuss the importance of understanding in crystal structure of metal and why different crystal structures exhibit different strengths and ductility. (Word limit: ~150)arrow_forwardA hypothetical metal alloy has a grain diameter of 2.4 x 10-2 mm. After a heat treatment at 575°C for 500 min, the grain diameter has increased to 8.1× 10-2 mm. Compute the time required for a specimen of this same material (i.e., do = 2.4 × 10-2 mm) to achieve a grain diameter of 5.5 × 10-2 mm while being heated at 575°C. Assume the n grain diameter exponent has a value of 2.2.arrow_forward
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