EBK MANUFACTURING ENGINEERING & TECHNOL
7th Edition
ISBN: 8220100793431
Author: KALPAKJIAN
Publisher: PEARSON
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Chapter 1, Problem 9RQ
To determine
Enlist every major types of imperfection in the crystal structure of metals, and elaborate the same.
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Define the difference between elastic and plastic deformation in terms of the effect on the crystal lattice structure.
The accompanying figure shows a unit cell for a hypothetical metal.
(a) To which crystal system does this unit cell belong?
(b) What would this crystal structure be called?
(c) Calculate the density of the material, given that its atomic weight is 145 g/mol.
+2
90°i
0.40 nm
+y
90°
90°
0.30 nm
- 0.30 nm
The accompanying figure shows a unit cell for a hypothetical metal.
(a) To which crystal system does this unit cell belong?
(b) What would this crystal structure be called?
(c) Calculate the density of the material, given that its atomic weight is 145 g/mol.
+2
90°i
0.40 nm
+y
90°
90°
0.30 nm
0.30 nm
+X
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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- 2. Briefly describe are dislocations are necessary or bad for us? Additionally, define three types of defects in metals.arrow_forwardSlip Systems 1. One slip system for the BCC crystal structure is {110}(111). In a manner similar to Figure 7.6b, sketch a {110} -type plane for the BCC structure, representing atom positions with circles. Now, using arrows, indicate two different (111) slip directions within this plane. E D (a) Figure 7.6 B A D E F (b)arrow_forwardWhat is the change in the free energy of a pure metal atom moving from one grain to another? Please draw the schematical illustration of the free energy and elaborate your answerarrow_forward
- Explain 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_forwardDetermine the ASTM grain size number if 90 grains per square inch are measured at a magnification of 55×. In this problem, you are asked to find the ASTM grain size number given the number of grains per square inch and the magnification. Solve Equation 4.18 (below) for G.arrow_forwardA single crystal of silver is oriented so that the (111) slip plane is perpendicular to an applied stress of 50 MPa. List the slip systems composed of close-packed planes and directions that may be activated due to this applied stress.arrow_forward
- A single crystal Al,O, rod (precisely 6 mm diameter7 60 mm long) is used to apply loads to smalsamples in a high-precision dilatometer (a longin.measuring device). Calculate the resulting imdimensions if the crystal is subjected to a 33-kN arigcompression load.arrow_forwardExplain the types of dislocations in a crystal structure with neat diagramsarrow_forwardOne slip system for the HCP crystal structure is {0001}. Sketch this plane along with the HCP atoms and identify 3 different slip directions within this plane.arrow_forward
- One slip system for the BCC crystal structure is {110} . Sketch this plane along with the BCC atoms and identify two different slip directions within this plane.arrow_forwardb. Figure 2 shows another ball-and-stick model of a very small crystal of a- Polonium, but this crystal contains one edge dislocation. Answer the questions. Figure 2: If the edge dislocation moves by slip or glide by one unit of b from left to right, how many bonds will be broken to achieve this outcome? Answer: To move the dislocation from its current position (Fig. 2) to the far right (so that a small step of size b appears at the right-side face), how many bonds will be broken? Answer:arrow_forwardOne slip system for the HCP crystal structure is {0001}(1120). In a manner similar to Figure 7.6b, sketch a {0111}-type plane for the HCP structure and, using arrows, indicate three different (1120) slip directions within this plane. You may find Figure 3.9 helpful.arrow_forward
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