Journal
JOURNAL OF ARCHAEOLOGICAL SCIENCE
Volume 74, Issue -, Pages 60-74Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jas.2016.08.005
Keywords
Inverse segregation; As-Cu alloy; Prehistory; SEM-EDXS; Metallography; Solidification; Freezing
Funding
- European Union [656244]
- Marie Curie Actions (MSCA) [656244] Funding Source: Marie Curie Actions (MSCA)
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This study revaluates reported cases of prehistoric As-Cu objects with 'silvery surfaces', which are usually interpreted as the result of inverse segregation. Further possible explanations for such surfaces, such as an arsenic-rich alpha-solid solution, cementation, or post-depositional precipitation, are discussed. The segregation of arsenic was studied in As-Cu ingots produced in chill cast moulds at several compositions, which underwent surface treatment with an NaCI solution. The microstructure and surfaces of the As-Cu alloys were analysed using optical microscopy and SEM-EDXS. Special note of out-of-equilibrium As-Cu phases are discussed, as well as a comparison of inverse segregation to all other means of achieving surface silvering. (C) 2016 Elsevier Ltd. All rights reserved.
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