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Thermal Fatigue tests of a Ti-24Al-11Nb matrix composite unidirectionally reinforced with SiC fiber, SCS-6/Ti-24Al-11Nb, have been carried out without external load in air and in vacuum, under various thermal cycling conditions. The following characteristics of the material subjected to thermal fatigue and isothermal exposure were investigated: (i) crack nucleation and the change in density with thermal cycling; (ii) change of the fiber/matrix interface morphology by means of Electron Probe Micro Analyzer and Scanning Electron Microscope; (iii) change of the interfacial shear strength by fiber push-out tests, and (iv) effect of environment on the properties from (i) to (iii). Methodologies are also proposed for the characterization of damage due to thermal fatigue.
Ti-24Al-11Nb matrix composite, SiC fiber, thermal fatigue, push-out test, interfacial shear strength, environment, depletion of carbon coating, crack density, damage assessment
Professor, The University of Tokyo, Tokyo,
Chief Researcher, Gifu Technical Institute, Kawasaki Heavy Industries Ltd., Gifu,