# ch08 - Chapter 8 Deformation and Strengthening Mechanisms...

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Chapter 8 Deformation and Strengthening Mechanisms Concept Check 8.1 Question: Which of the following is the slip system for the simple cubic crystal structure? Why? {100}<110> {110}<110> {100}<010> {110}<111> ( Note: a unit cell for the simple cubic crystal structure is shown in Figure 3.42. ) Answer: The slip system for some crystal structure corresponds to the most densely packed crystallographic plane, and, in that plane, the most closely packed crystallographic direction. For simple cubic, the most densely packed atomic plane is the {100} type plane; the most densely packed direction within this plane is an <010> type direction. Therefore, the slip system for simple cubic is {100}<010>.

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Concept Check 8.2 Question: Explain the difference between resolved shear stress and critical resolved shear stress . Answer: Resolved shear stress is the shear component of an applied tensile (or compressive) stress resolved along a slip plane that is other than perpendicular or parallel to the stress axis. The critical resolved shear stress is the value of resolved shear stress at which yielding begins; it is a property of the material.
Concept Check 8.3 Question: When making hardness measurements, what will be the effect of making an indentation very close to a preexisting indentation? Why? Answer: The hardness measured from an indentation that is positioned very close to a preexisting indentation will be high. The material in this vicinity was cold-worked when the first indentation was made.

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Concept Check 8.4
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ch08 - Chapter 8 Deformation and Strengthening Mechanisms...

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