Materials Science Questions and Answers – Slip Systems

This set of Materials Science Multiple Choice Questions & Answers (MCQs) focuses on “Slip Systems”.

1. Slip plane along with the direction of slip is called a slip system.
a) True
b) False
View Answer

Answer: a
Explanation: Slip system is a combination of a slip plane and the slip direction for which the dislocation moves easily and leads to plastic deformation. For each crystal structure there exists its own set of slip systems.

2. How many slip system are there in FCC lattice?
a) 12
b) 6
c) 10
d) 18
View Answer

Answer: a
Explanation: The number of slip planes are four and the number of slip direction are three in an FCC lattice. Therefore the total number of slip system is given by their multiplication that is twelve.

3. Slip planes do not occur where ______
a) Atom density is high
b) Atom density is low
c) Atoms are closely placed
d) direction of slip plane is the same as the translation vector which is the shortest
View Answer

Answer: b
Explanation: Slip planes occur in planes where the atom density is high and hence the atoms are closely packed. Further, the direction of slip plane is the same as that of the translation vector which is the shortest.
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4. Which law is related to slip plane and slip direction?
a) Bragg’s law
b) Fick’s law
c) Schmid’s law
d) Such a law doesn’t exist
View Answer

Answer: c
Explanation: Schmid’s law gives us a relation between critically resolved shear stress and stress applied on the material. Where critical resolved shear stress is that component of shear stress which is in the slip direction.

5. Which of the following factors are more accurate when used for polycrystal metals?
a) Schmid’s factor
b) Taylor factor
c) Independent factor
d) Max factor
View Answer

Answer: b
Explanation: Schmid’s factor is accurate for FCC crystal but for polycrystal metals use of the Taylor factor gives us a more accurate result.
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6. Value of critical resolved shear stress for a given material at a given temperature ______
a) Increases with time
b) Decreases with time
c) Decreases harshly with time
d) Remains constant
View Answer

Answer: d
Explanation: The critical resolved shear stress is independent of time and for a given material at a given temperature its value remains constant. It varies with a change in temperature.

7. Which of the following stresses is required for the slip to occur?
a) Tensile stress
b) Compressive stress
c) Critical resolved shear stress
d) Slip doesn’t occur due to stress
View Answer

Answer: c
Explanation: A critical resolved shear stress is that component of shear stress which is in the slip direction and hence needed for a slip to occur. Tensile or compressive stress aren’t needed for a slip.
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8. How many slip systems are there in BCC lattice?
a) 36
b) 48
c) 24
d) 18
View Answer

Answer: b
Explanation: The number of slip plane is 48 for a BCC material. There are 6 planes of type {110} with 2 direction which gives us 12, in addition, there are 24 systems of {123} and 12 systems of {112}. Hence we get a total of 48.

9. How many slip systems are there in hexagonal closed packed crystal?
a) 3
b) 6
c) 9
d) 18
View Answer

Answer: a
Explanation: In a hexagonal closed packed structure the slip is limited in comparison to bcc or fcc and allows slip in dense basal planes where the number of slip planes are calculated to be 3.
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10. Slip is important for deformation to occur.
a) True
b) False
View Answer

Answer: a
Explanation: The above statement is true. Slip is the mechanism that is followed by the dislocation when under plastic force to undergo deformation which can be seen on a three-dimensional level due to these microscopic slips.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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