Abstract
Fatigue crack growth in polycrystalline molybdenum at room temperature has been examined. Crack formation occurred preferentially at grain boundaries with less frequent formation of cracks in the intense slip bands within the grains. The Stage I type of crack growth was not observed and the results indicate that the nucleation of fatigue cracks occupies the predominant part of the fatigue life over the entire life range studied. Fracture always occurred by the slow growth of a crack in a series of steps along grain boundaries approximately perpendicular to the stress axis until the crack was sufficiently large to satisfy the criterion for catastrophic cleavage. One unusual mode of crack growth was observed in which each step is believed to occur in a quasi-brittle manner.
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