Metallographical Characterisation of a Traditionally Shaped High Tin Bronze Eating Bowl / Metallographische Untersuchung einer traditionell geformten Eßschale aus Bronze mit hohem Zinngehalt

R. M. Pillai · S. G. K. Pillai · A. D. Damodaran

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Metallurgy and Cultural Artifacts Cultural Heritage Materials Analysis Metallurgical and Alloy Processes

Abstract

Metallographical characterisation of a traditionally shaped high tin bronze eating bowl is presented. The bowl was made up of Cu-22 wt% tin alloy shaped by thermomechanical processing in the β phase region followed by quenching to arrest precipitation of brittle δ phase resulting in a reasonably ductile and tough material for the intended usage. Microhardness values of α and β phases fall between 160 and 170 VPN and between 240 and 270 VPN respectively. Microstructure consists of fully recrystallised and twinned α phase and quenched β phase, the latter having typical martensitic structure.

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