Which outcome occurs when sulfide minerals contaminate Bronze Age copper ore during smelting?

💡 Explanation

When sulfide minerals contaminate the ore, sulfur diffuses into the bronze, causing grain boundary embrittlement because the formation of copper sulfides weakens the material. Therefore, embrittlement and casting defects increase, rather than increased hardness, corrosion resistance, or lowered melting point, which require different alloying or heat treatments.

• During winter, which outcome reduces the structural integrity of a Roman aqueduct's arched keystone?
• Which problem increased as early steam engines scaled up to power industrial machinery?
• Which structural consequence arises in a ziggurat foundation undergoing differential settlement when built on alluvial soil?
• Which effect most limited maximum quenching rate in Mesopotamian bronze metallurgy?
• Which structural problem frequently occurred in ancient Mesopotamian mud-brick canals during annual flooding?
• Which mechanism explains why the Romans could build arches from individual voussoirs without mortar?