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← TechnologyWhich outcome occurs when forging aluminum alloy components near its solidus temperature?
A)Liquidus segregation-induced composition variations
B)Increased intergranular boundary cavitation weakness✓
C)Grain refinement enhancing fatigue resistance
D)Elevated forging die thermal shock cracking susceptibility
💡 Explanation
Intergranular boundary cavitation weakness occurs because forging near the solidus temperature introduces creep voids; these weaken grain boundaries due to increased atomic diffusion via Coble creep. Therefore mechanical properties degrade, rather than improving grain structure or die life, because high temperatures lead to void formation.
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