SiC particle reinforced oxynitride glass: stress relaxation, creep and strain-rate imposed experiments

摘要

The stress relaxation and creep behaviors of particulate composites consisting of SiC particles embedded in an oxynitride glass matrix were characterized for particle size and volume fraction from 3 to 150 μm and 0 to 40/100, respectively. The presence of rigid particles results in significant decreases in the relaxation kinetics and creep rates. Furthermore, the apparent viscosity of the composites exhibits a strain dependence(strain hardening), and a critical strain, depending on both particle size and volume fraction, at which flow is apparently blocked has been successfully introduced to interpret the data. A preliminary study of the behavior at constant strain rates in the 10~-5-10~-1/s range shows a tension-compression flow asymmetry as well as a shear thinning effect for strain rates above 10~-3/s.