(a). A straight segment of dislocation line of length L is pinned at two particl
ID: 2250420 • Letter: #
Question
(a). A straight segment of dislocation line of length L is pinned at two particles in a crystal. The application of a shear stress t causes the dislocation to bow outwards as shown in the following figure, descreasing its radius of curvature as it does so. The force per unit length acting on the dislocation is tau b L, where b is Burger's vector. Givent that the dislocation line tension T=Gb^2/2, show that the stress just large enough to fully bow out the dislocation segment into a semi-circle is givenby tau=Gb/L
(b). Estimate the tensile yield stress of aluminum containing an array of equally spaced second-phase precipitates, where the volume fraction of the second phase is 5% and the precipitate diameter is 0.1um. The burger's vector is 0.29nm.
(c). if incorrect heat treatment of the aluminum alloy results in a non-uniform distribution of precipitates, explain the effect this would have on the yield stress.
given by ? G074 dislocation particleExplanation / Answer
The answer of following question is as follows.
The tensile yield stress is 650 Mpa
The yield stress is going to be behave as a fluctuating stress while the amplitude is of the stress is depend on the load applied.
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