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← ScienceWhich outcome occurs when a bimetallic strip undergoes repeated thermal cycling across Curie temperature?
A)Progressive work hardening of crystal lattice
B)Gradual mechanical fatigue and delamination✓
C)Increasing resistance to thermal expansion
D)Enhanced magnetic coupling and sensitivity
💡 Explanation
When cycled across the Curie temperature, repeated phase transitions influence atomic alignment, causing increased stress concentrations along grain boundaries, leading to fatigue. Therefore mechanical fatigue and delamination result, rather than hardening, resistance, or enhanced magnetism, which require different physical processes.
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