Creep-fatigue behaviour of a particulate metal matrix composite

Results of a study of the behavior of an MMC in the creep-fatigue regime are presented. The study was carried out in order to identify a suitable constitutive model to evaluate the damage deriving from the interaction of the aforementioned phenomena. The examined material is a recently introduced MMC intended for aeronautical components to improve the performances of air-engine systems. It is a composite obtained by HIPing titanium alloy powders (Ti6Al2Sn4Zr2Mo) reinforced by dispersed TiC particles with a volume fraction of 10 percent. The fatigue tests were carried out both at room temperature and two creep temperature values, while the constant load creep test was carried out at 600 C only. The fatigue test data were processed using a Bayesan linear regression analysis, whereas the creep data were interpreted with a linear model. We defined a criterion in order to evaluate the creep fatigue damage at 600 C, which needs further experimental verifications through the use of the aforementioned testing procedure