TY - JOUR
T1 - An archaeometallurgical study of Mixtec silver gold alloy foils from Tomb No. 7, Monte Alban, Oaxaca, México
AU - Ortega-Avilés, M.
AU - Tenorio-Castilleros, D.
AU - Segura-Venzor, I. L.
AU - Miranda-Hernández, José G.
AU - Velasco, M. A.
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/2/15
Y1 - 2020/2/15
N2 - This work evaluates four groups of silver gold alloy foil samples from Tomb No. 7 from Monte Albán, Oaxaca. These were classified as received according to coloration as LG1, LG2, LG3, and LG4. These samples were called silver gold alloy foils because of their main elemental composition. These were analyzed (without alterations) via optical microscopy, scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). It was necessary to prepare them by focused ion beam (FIB) cross section to know their real microstructure and finally to test their indentation hardness (HIT) and indentation modulus (EIT) to measure mechanical properties. The experimental results revealed that silver gold alloys were cold-worked and annealed using a mixed technique of hammering with intermediate annealing for grain-size refinement. These were modified in their mechanical properties. The LG2 sample was the thinnest (27 μm) and hardest foil (HIT = 1781.7 MPa). It has the highest Au content (56.9 wt%) and the lowest Cu content (1.5 wt%) unlike LG4, which was the softest foil (HIT = 325.1 MPa). This sample showed non-recrystallized grains: This was the major superficial damage and led to a deficient work metal.
AB - This work evaluates four groups of silver gold alloy foil samples from Tomb No. 7 from Monte Albán, Oaxaca. These were classified as received according to coloration as LG1, LG2, LG3, and LG4. These samples were called silver gold alloy foils because of their main elemental composition. These were analyzed (without alterations) via optical microscopy, scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). It was necessary to prepare them by focused ion beam (FIB) cross section to know their real microstructure and finally to test their indentation hardness (HIT) and indentation modulus (EIT) to measure mechanical properties. The experimental results revealed that silver gold alloys were cold-worked and annealed using a mixed technique of hammering with intermediate annealing for grain-size refinement. These were modified in their mechanical properties. The LG2 sample was the thinnest (27 μm) and hardest foil (HIT = 1781.7 MPa). It has the highest Au content (56.9 wt%) and the lowest Cu content (1.5 wt%) unlike LG4, which was the softest foil (HIT = 325.1 MPa). This sample showed non-recrystallized grains: This was the major superficial damage and led to a deficient work metal.
KW - Au/Ag/Cu
KW - Indentation hardness (H)
KW - Indentation modulus (E)
KW - Microstructure
KW - Monte Albán
UR - http://www.scopus.com/inward/record.url?scp=85076758353&partnerID=8YFLogxK
U2 - 10.1016/j.matchemphys.2019.122475
DO - 10.1016/j.matchemphys.2019.122475
M3 - Artículo
AN - SCOPUS:85076758353
SN - 0254-0584
VL - 242
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
M1 - 122475
ER -