Development of Microscopic Observation system based on Atomic Force Microscopy of Fatigue Damage Process under Hydrogen Environment And Investigation of Damage Mechanism

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It was observed the behavior of fatigue crack initiation behavior and early propagation in the two-phaseα-βTi-6Al-4V alloy andα-brass. It was clear that the crack deflection behavior was dominated by the relative geometry of the slip surface shape and curvature of the crack front. And also, it was found that fatigue crack inclined along the direction of the continuity of the crack surfaces was kept. In Ti-6Al-4V alloy, the fatigue crack initiated in the large and relatively soft.-grains and propagated along grain boundaries ofα+βphase when it reached at the grain boundaries between.-phase andα+βphase.