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← ScienceWhich effect arises when exceeding critical temperature for reversible shape memory alloy transitions?
A)Permanent deformation develops from dislocation pinning✓
B)Corrosion rate increases due to martensite formation
C)Electrical resistance decreases from austenite stabilization
D)Thermal conductivity reduces from phase segregation
💡 Explanation
When critical temperature is exceeded, the shape memory alloy loses its ability to fully revert because permanent deformation mechanisms like dislocation pinning prevail above the austenitic finish temperature. Therefore permanent deformation arises, rather than corrosion, decreased electrical resistance or reduced thermal conductivity which require microstructural evolution at lower temperatures.
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