Abstract
A study has been made of the crystallographic nature of fatigue crack propagation in pure Al-Cu alloys. For a wide range of crack growth rate and microstructure the fatigue fracture surfaces observed appear indicative of ‘classical’ cleavage fracture. X-ray diffraction studies indicate that the crystallographic facets lie on {100} planes, consistent with failure by cleavage in this system. However, the results of environmental and mean stress experiments show conclusively that a true cleavage mechanism cannot be operating. A restricted-slip mechanism is proposed which successfully accounts for the observed plane of fracture.
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