Chapter 7: Problem 19

List four major differences between deformation by twinning and deformation by slip relative to mechanism, conditions of occurrence, and final result.

Short Answer

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Short Answer: Deformation by twinning involves coordinated atom rearrangement, occurs under high strain rates, low temperatures, and high stresses, and results in a new crystal structure with a twin boundary. Deformation by slip involves dislocation movement causing atomic planes to slide, occurs at lower stresses and higher temperatures, and results in a changed lattice shape without a new crystal structure or orientation change.

Step by step solution

1. Definition of Deformation by Twinning and Deformation by Slip

Deformation by twinning is a type of deformation that occurs when a crystal lattice is rearranged due to external stress. In this process, all atoms in a specific region of a crystal lattice rearrange their positions simultaneously, forming a twin boundary. Deformation by slip, on the other hand, is a deformation process in which dislocations move within the crystal lattice, causing atomic planes to slide past one another.

2. Mechanism of Deformation by Twinning and Deformation by Slip

In deformation by twinning, the mechanism involves the entire volume of a region of the lattice partaking in the deformation. The atoms within this region rearrange themselves in a coordinated and discrete manner over a distinct twin boundary. In contrast, deformation by slip occurs by the movement of dislocations through the crystal lattice. This movement causes the atomic planes to slide past each other in a continuous manner.

3. Conditions of Occurrence for Deformation by Twinning and Deformation by Slip

Deformation by twinning occurs under specific conditions such as high strain rates, low temperatures, and high stresses. These conditions tend to be more severe than the conditions under which deformation by slip occurs. Deformation by slip is more common and generally occurs at lower stresses and higher temperatures than twinning.

4. Final Result of Deformation by Twinning and Deformation by Slip

The final result of deformation by twinning is a new crystal structure with a mirror image twin boundary. This twin boundary will create an orientation change across it, which can be observed using polarized light microscopy. In contrast, the final result of deformation by slip is a change in the shape of the crystal lattice, with the atomic planes shifted relative to one another, but no new crystal structure or orientation change.

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List four major differences between deformation by twinning and deformation by slip relative to mechanism, conditions of occurrence, and final result.

Short Answer

Step by step solution

1. Definition of Deformation by Twinning and Deformation by Slip

2. Mechanism of Deformation by Twinning and Deformation by Slip

3. Conditions of Occurrence for Deformation by Twinning and Deformation by Slip

4. Final Result of Deformation by Twinning and Deformation by Slip

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