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← ScienceWhich outcome occurs when rapid thermal cycling stresses solder joints?
A)Creep increases, causing joint failure✓
B)Grain growth enhances joint strength
C)Annealing lowers internal stress uniformly
D)Recrystallization fully restores joint ductility
💡 Explanation
Thermal cycling causes creep because repetitive expansion/contraction accelerates dislocation motion, ultimately leading to fatigue failure. Therefore, creep increases, rather than annealing because stresses are unevenly distributed, and grain growth does not compromise ductility.
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