The purpose of this research is to bring out the microstructural parameters that control the damage of the Ti-6 AI-2 Sn-4 Zr-6 Mo alloy in vibratory fatigue at 20 kHz at stress temperatures of 77 and 300 K. A microstructural characterization was done at various scales size and deformation of the p ex-grains, morphologies of the primary #alpha# phase coming from forging, fine precipitation appearing by decomposition of the p phase during quenching. Comparison for the various thermomechanical treatment ranges of the results of fatigue tests and quantification of the microstructure have ended in a better understanding of the damage mechanisms and in quantifying the influence of the number of #alpha#_p/#beta# interfaces on crack initiation.
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