Which action enabled Mesopotamian bronze smiths to achieve superior hardness in their cast tools and weapons?

💡 Explanation

Strategic tin addition altered the copper-tin alloy composition during smelting, creating bronze, a metal stronger than pure copper because the tin atoms disrupt the copper crystal lattice, inhibiting dislocation movement. Therefore, adding tin resulted in superior hardness and durability, rather than quenching, annealing or powder consolidation, which require differing thermal treatments and advanced processing techniques not available at the time.

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