The influence of microstructure on fatigue short crack-growth behavior in SiAlON at room temperature

摘要

The micromechanisms and characteristics of fatigue crack-growth in SiAlON ceramic with different microstructures were studied. The material with the highest content of large aspect ratio, rod-like β-SiAlON grains showed the highest resistance to fatigue crack growth under cyclic loads at room temperature. Under cyclic loads, stress corrosion, wear degradation of asperities through friction were considered to describe the fatigue crack-growth behavior.