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Table 1 Three kinds of effects caused by thermal treatments and together affecting the microstructure and the mechanical strength (σbb, Eb, and HV) of the samples (effect : grain growth, effect : recrystallization, effect : oxidation reactions)

From: Optimizing the thermal treatment for restoration of brittle archaeological silver artifacts

Temperature (°C) Recrystallization Existential effect Dominant effect Trend of mechanical strength (σbb/Eb/HV) Maximum value produced
200–350
350–500 Low efficient S500
500–750 Low efficient
750–800 Highly efficient S800
800–900 Highly efficient
  1. The combination of the three effects causes overall changes in the mechanical strength of the samples and produces maximum values of S500 and S800