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Which consequence results when stress surpasses a crystal's yield strength?

A)Permanent plastic deformation will occur
B)Elastic strain returns to zero
C)Crystal lattice remains perfectly immobile
D)The material perfectly maintains original shape

💡 Explanation

Permanent plastic deformation is observed because dislocation slip within the crystal structure occurs above the yield strength limits the crystal's structure. Therefore, yielding causes dislocations; rather than perfect elasticity that would return the shape, as material strength is exceeded.

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