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← HistoryWhich outcome occurs when ancient bronze casting crucibles experience thermal variations?
A)Differential cooling causes thermal stresses✓
B)Alloy purification increases tensile strength
C)Faster heating improves crystalline structures
D)Oxidizing atmosphere yields stronger alloy
💡 Explanation
Localized thermal expansion creates internal tensions triggering cracking, because differential cooling causes uneven solidification, increasing stresses. The resulting fracture worsens the casting, rather than strengthening its microstructure therefore hindering processes that yield stronger bronze.
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