Which of the following statements concerning dislocations is FALSE? The energy r

Question

Which of the following statements concerning dislocations is FALSE?

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.

Dislocation density (count per volume) generally increases during plastic deformation at room temperature.

Dislocations feature strain fields that interact with other strain fields in a crystal (such as those produced by other crystalline defects).

While dislocations can exist in ionic and covalent ceramic materials, their motion in these materials is extremely difficult compared to metals.

Dislocations move in response to local shear stresses within a crystal.

Dislocations that are in close proximity tend to mutually prevent one another's motion.

Dislocation motion is generally more difficult in BCC metals versus HCP metals.

Dislocations prefer to slip on high density planes and in high density directions 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.

Dislocation density (count per volume) generally increases during plastic deformation at room temperature.

Dislocations feature strain fields that interact with other strain fields in a crystal (such as those produced by other crystalline defects).

While dislocations can exist in ionic and covalent ceramic materials, their motion in these materials is extremely difficult compared to metals.

Dislocations move in response to local shear stresses within a crystal.

Dislocations that are in close proximity tend to mutually prevent one another's motion.

Dislocation motion is generally more difficult in BCC metals versus HCP metals.

Dislocations prefer to slip on high density planes and in high density directions within a crystal.

Explanation / Answer

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.---- FALSE Dislocation density (count per volume) generally increases during plastic deformation at room temperature.-----TRUE Dislocations feature strain fields that interact with other strain fields in a crystal (such as those produced by other crystalline defects).-----TRUE While dislocations can exist in ionic and covalent ceramic materials, their motion in these materials is extremely difficult compared to metals.-----TRUE Dislocations move in response to local shear stresses within a crystal.----TRUE Dislocations that are in close proximity tend to mutually prevent one another's motion.-----TRUE, Same direction dislocations repulse each other, while opposite direction dislocations attract each other. Dislocation motion is generally more difficult in BCC metals versus HCP metals.-----FALSE, opposite is the fact. Dislocations prefer to slip on high density planes and in high density directions within a crystal.-----TRUE

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