Homework Answers
Pores and vacancy are point defects ( zero dimensional defect)
Screw dislocation is line defect ( one dimensional)
Grain boundaries are two dimensional or surface defects.
Only option D is correct.
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Which of the following defects are two dimensional: a) Pores b) Vacancies c) Screw dislocations d)...
answer both plz 5. Circle true of false for the following statements: a) A material can be strengthened by increasin...
answer both plz
5. Circle true of false for the following statements: a) A material can be strengthened by increasing the number of grains. b) Most pure metals are good electrical conductors at relatively low temperatures due to the electron cloud c) Non-crystalline structures do not display long range order. d) Dislocations create defects in polymers e) Grain boundaries are the surfaces that separate individual grains. TF 6. Why are grain boundaries important to solid materiak:?
5. Circle true of...
can you help me with these practice problems Creep occurs by:- a. constant stress at room...
can you help me with these practice problems
Creep occurs by:- a. constant stress at room temperature, b. high temperatures over 1000C. c. constant stress at temperatures over 0.5 TM in K, d. none of these. Creep rates for polymers at 23C are:- a. high, b. low, c. same as metals. In a low carbon steel the upper yield point depends upon:- a. screw dislocations at grain boundaries, b. carbon atoms at dislocations, c. intersecting slip planes, d. second phases....
Name List two types of dislocations. The atom percentage for an alloy containing 90 wt% Au...
Name List two types of dislocations. The atom percentage for an alloy containing 90 wt% Au and 10% Ag is-i For an ASTM grain size of 8, the number of grain per square inchis In Cu single crystal, the surface energy of (001) İs lower than that of (1 1) T A low carbon steel contains 0.1 Swt% C, the number of C in a unit cell is- Scare 2s 2pts) -(2pts). (2pts) F-(2pts) -(2pts) 5 A twin boundary is...
Between the (external) surface energy and grain boundary energy in a solid material, which one is...
Between the (external) surface energy and grain boundary energy in a solid material, which one is greater? Surface energy is higher Grain boundary energy is higher. Neither. Both are equal. Not enough information to make this comparison Vanadium, molybdenum, and sodium all have a body-centered cubic structure. Given the following atomic radii, which two metals are most likely to form a solid solution? Metal Atomic radii V 0.131 Μο 0.136 Na 0.186 Vanadium, molybdenum Vanadium, sodium Molybdenum, sodium Defects play...
1.1 Which of the following is NOT a combination of slip planes and slip directions of...
1.1 Which of the following is NOT a combination of slip planes and slip directions of FCC? (A) (111) [10i] (8) (111) (T10] 1.2 Which of the following best explains why FCC metals (Cu, Al, Ni, Ag, Au) are of higher ductility than HCP metals (Mg, Ti, Zn)? (A) Because FCC metals have more free electrons to move around and facilitate dislocation motion; (B) Because FCC metals have more number of slip systems (i.e. slip planes and slip directions) (C)...
Material science 1) Polypropylene (PP) has a glass-transition temperature of -15 oC and a melting...
Material science 1) Polypropylene (PP) has a glass-transition temperature of -15 oC and a melting temperature of 175 oC. This means that at a temperature of -40 oC that PP is ________, and at temperature 0 oC PP is _________ . (A) brittle, brittle (B) ductile, brittle (C) brittle, ductile (D) ductile, ductile (E) low in thermal conductivity, high in thermal conductivity. .2) Galvanized steel corrodes slowly in air because: (A) the...
3. (5 points) Which type of defect includes an additional half-plane of atoms within a crystal?...
3. (5 points) Which type of defect includes an additional half-plane of atoms within a crystal? a) Phase boundary b) Edge dislocation c) Screw dislocation d) Grain boundary 4. (5 points) A mixed dislocation is a type of a) Linear defect b) Interfacial defect c) Point defect d) Volume defect 5. (5 points) The figure shown below is an example of a a) Point defect b) Planar (i.e. two-dimensional) defect c) Linear defect d) Volumetric defect 6. (5 points) Grain...
1) a) b) c) d) The type of polyethylene where the molecule has many branches and...
1) a)
b)
c)
d)
The type of polyethylene where the molecule has many branches and hence cannot crystallize well is HDPE. O True False Crosslinked molecules cannot crystallize easily. O True O False As discussed in the videos, the top flat layer of cooking ranges (where we place a vessel to heat) in a kitchen is generally made of a engineering thermoplastic glass-ceramic Metallic alloys with large grain size and low vacancy concentration glass thermoset single crystal metallic alloys...
A single crystal in the form of a cube has two possible slip planes. (1) and...
A single crystal in the form of a cube has two possible slip planes. (1) and (2). as shown in the sketch below. Each of these planes has two possible slip directions, (a) and (b), as is also shown. The angle between the tensile load axis and slip plane normal for both slip planes is 450 40 <plane (1)> <plane (2)> a) If a stress is applied to this crystal in the direction noted, specify which particular (eg. plane (1),...
in 5. The following data apply to the C-clamp: a. The screw is ACME with %...
in 5. The following data apply to the C-clamp: a. The screw is ACME with % " Diameter b. Coefficient of thread friction c. Coefficient of collar friction = 0.2 d. Mean collar radius = 0.4 in. e. Max. clamping force 1200 lb Determine: =0.12 The tightening torque The operator force at the end of the handle (Note: Use table 8-3 to determine the screw pitch (p)) (5 points)
answer both plz
5. Circle true of false for the following statements: a) A material can be strengthened by increasing the number of grains. b) Most pure metals are good electrical conductors at relatively low temperatures due to the electron cloud c) Non-crystalline structures do not display long range order. d) Dislocations create defects in polymers e) Grain boundaries are the surfaces that separate individual grains. TF 6. Why are grain boundaries important to solid materiak:?
5. Circle true of...
can you help me with these practice problems
Creep occurs by:- a. constant stress at room temperature, b. high temperatures over 1000C. c. constant stress at temperatures over 0.5 TM in K, d. none of these. Creep rates for polymers at 23C are:- a. high, b. low, c. same as metals. In a low carbon steel the upper yield point depends upon:- a. screw dislocations at grain boundaries, b. carbon atoms at dislocations, c. intersecting slip planes, d. second phases....
Name List two types of dislocations. The atom percentage for an alloy containing 90 wt% Au and 10% Ag is-i For an ASTM grain size of 8, the number of grain per square inchis In Cu single crystal, the surface energy of (001) İs lower than that of (1 1) T A low carbon steel contains 0.1 Swt% C, the number of C in a unit cell is- Scare 2s 2pts) -(2pts). (2pts) F-(2pts) -(2pts) 5 A twin boundary is...
Between the (external) surface energy and grain boundary energy in a solid material, which one is greater? Surface energy is higher Grain boundary energy is higher. Neither. Both are equal. Not enough information to make this comparison Vanadium, molybdenum, and sodium all have a body-centered cubic structure. Given the following atomic radii, which two metals are most likely to form a solid solution? Metal Atomic radii V 0.131 Μο 0.136 Na 0.186 Vanadium, molybdenum Vanadium, sodium Molybdenum, sodium Defects play...
1.1 Which of the following is NOT a combination of slip planes and slip directions of FCC? (A) (111) [10i] (8) (111) (T10] 1.2 Which of the following best explains why FCC metals (Cu, Al, Ni, Ag, Au) are of higher ductility than HCP metals (Mg, Ti, Zn)? (A) Because FCC metals have more free electrons to move around and facilitate dislocation motion; (B) Because FCC metals have more number of slip systems (i.e. slip planes and slip directions) (C)...
3. (5 points) Which type of defect includes an additional half-plane of atoms within a crystal? a) Phase boundary b) Edge dislocation c) Screw dislocation d) Grain boundary 4. (5 points) A mixed dislocation is a type of a) Linear defect b) Interfacial defect c) Point defect d) Volume defect 5. (5 points) The figure shown below is an example of a a) Point defect b) Planar (i.e. two-dimensional) defect c) Linear defect d) Volumetric defect 6. (5 points) Grain...
1) a)
b)
c)
d)
The type of polyethylene where the molecule has many branches and hence cannot crystallize well is HDPE. O True False Crosslinked molecules cannot crystallize easily. O True O False As discussed in the videos, the top flat layer of cooking ranges (where we place a vessel to heat) in a kitchen is generally made of a engineering thermoplastic glass-ceramic Metallic alloys with large grain size and low vacancy concentration glass thermoset single crystal metallic alloys...
A single crystal in the form of a cube has two possible slip planes. (1) and (2). as shown in the sketch below. Each of these planes has two possible slip directions, (a) and (b), as is also shown. The angle between the tensile load axis and slip plane normal for both slip planes is 450 40 <plane (1)> <plane (2)> a) If a stress is applied to this crystal in the direction noted, specify which particular (eg. plane (1),...
in 5. The following data apply to the C-clamp: a. The screw is ACME with % " Diameter b. Coefficient of thread friction c. Coefficient of collar friction = 0.2 d. Mean collar radius = 0.4 in. e. Max. clamping force 1200 lb Determine: =0.12 The tightening torque The operator force at the end of the handle (Note: Use table 8-3 to determine the screw pitch (p)) (5 points)
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