Archaeological Arsenical Bronzes and Equilibrium in the As-Cu System

作者：Modlinger, Marianne^*; Cziegler, Andreas; Maccio, Daniele; Schnideritsch, Holger; Sabatini, Benjamin

来源：Metallurgical and Materials Transactions B-Process Metallurgy and Materials Processing Science, 2018, 49(5): 2505-2513.

DOI：10.1007/s11663-018-1322-8

• PHASE-EQUILIBRIA
• THERMODYNAMIC CALCULATION
• NI SYSTEM
• COPPER
• ALLOYS
• METAL
• MODEL

Understanding the effects of impurities, segregation, undercooling, and solidification velocity is necessary to reconstruct prehistoric As-Cu alloy manufacturing processes and practices. Moreover, these alloys often contain a wide variety of minor and trace elements such that the binary As-Cu equilibrium phase diagram does not adequately represent arsenical bronze artifacts as-cast in ancient molds. Furthermore, the variable cooling rates present in as-cast alloys of predominantly arsenic and copper, due to the thermal properties of differing mold materials, would have had profound effects on the formation of inversely segregated arsenic. Alloys with 1 to 15 wt pct arsenic were prepared and studied using differential thermal analysis, metallography, and scanning electron microscopy with energy-dispersive X-ray spectroscopy. Equilibrium diagrams were established and the potential influence of trace elements discussed. A new liquidus curve for the equilibrium diagram in this compositional range, measuring slightly higher in temperature, was established.

• 出版日期2018-10
• 单位MIT; 中国科学技术大学