Analysis identifies micro-mechanisms of fatigue crack growth in aluminum-copper alloy, suggesting dislocation structure plays a key role.
To elucidate the micro-mechanism of fatigue crack growth (FCG), this study conducts a direct analysis of the crack tip using several electron microscopic techniques. Particular attention is paid to FCG within a precipitation-hardened alloy, specifically aluminum (Al) - 2.4% copper (Cu). A small specimen containing the target crack tip is cut from a fatigued bulk specimen, and the two-step ion beam polishing method is applied to analyze its cross-section. It was found that FCG is strongly related to the formation of a dislocation cell structure, the size of which depends on the applied stress intensity factor range, ΔK.
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Takahashi et al. (2024) studied this question.
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