Which of the following statements concerning dislocations is FALSE? While disloc

Question

Which of the following statements concerning dislocations is FALSE? While dislocations can exist in ionic and covalent ceramic materials, their motion in these materials a extremely difficult compared to metals. Dislocation density (count per volume) generally increases during plastic deformation at room temperature. Dislocations prefer to slip on high density planes and in high density directions within a crystal. Dislocations that are in close proximity tend to mutually prevent one another's motion. Dislocation move in response to local shear stresses within a crystal. The energy required to move a dislocation increases as the magnitude of the Burger's vector associated with a given slip direction increases in a crystal. Dislocations feature strain fields that interact with other strain fields in a crystal (such as those produced by other crystalline defects). Dislocation motion is generally more difficult in BCC metals versus HCP metals.

Explanation / Answer

1. TRUE

2. True . This is due to strain hardening.

3. True

4. False, they support one another's motion.

5. true. Critically resolved shear stress is responsible for this.

6. True

7. False

8. False.

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