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Home / Questions / 1. Suppose a metal single crystal ioaded (.784px;”>s lstressed) in the [1 0 1] direction.a. If th

1. Suppose a metal single crystal ioaded (.784px;”>s lstressed) in the [1 0 1] direction.a. If th

1. Suppose a metal single crystal ioaded (.784px;”>s lstressed) in the [1 0 1] direction.a. If the critical resolved shear stress for this material is 0.34 MPa, what magnitude ofapplied stress is necessary for dislocations to begin to move in the (1 1 1)[-1 1 0] slipsystem?b. If the slip system listed in part a is valid, does this metal have the FCC, HCP, or BCCcrystal structure?2. Suppose you have an FCC metal single crystal which is known to have a critical resolvedshear stress of 55.2 MPa.a. Find the largest normal stress that could be applied to a bar of this material in the[1 1 2] direction before dislocations begin to move in the [1 0 -1] direction on the(1 1 1) plane.b. How does your answer change if it is a BCC crystal and the slip system is[1 1 1](1 0 -1) (with the same shear stress)?3. Consider the crystal structure for CaTiO3 (the perovskite structure) in which Ca2+ ions arelocated at the simple cubic positions, O2- ions are located at the six face centers, and theTi4+ ion is at the 1/2, 1/2, 1/2 position. Determine the direction and length of the lowest-energyBurgers vector for this compound.

 

Apr 16 2020 View more View Less

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