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The orientation dependence of long fatigue crack propagation was investigated for an aluminum-lithium (Al-Li) alloy (1420) at a stress ratio of 0.1. The methods used were three-point bending, compact tension and in situ pulsating fatigue in the scanning electron microscope (SEM) chamber. The in situ fatigue observations were emphasized on crack path morphology during fatigue. The extrinsic toughening...
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