Internal friction behavior of an unidirectionally solidified Al2O3/YAG eutectic at high temperature

The internal friction behavior of a unidirectionally solidified Al2O3/YAG eutectic was examined between room temperature and 1400 °C. No internal friction was observed up to 1200 °C. Above 1200 °C, the internal friction drastically increased with increasing temperature and the number of torsional loading cycles. For the 1400 °C test, the internal friction gradually increased with the number of loading cycles and then saturated after 103 cycles.