The effect of the Al₂O₃ dust environment on the crack propagation behaviour of 2524‐T3 Al alloy was investigated. The results show that the Al₂O₃ dust environment reduces the fatigue crack growth rate (FCGR) of alloy especially at low ΔK. Many Al₂O₃ particles are deposited and stuck in the crack during fatigue loading which promotes crack closure, while this effect is gradually weakened with the increase of ΔK. The deposited Al₂O₃ particles induce the disorderly arranged slip bands (SBs) ahead of the crack tip which deflects the crack path making it more tortuous in the Al₂O₃ dust.

中文翻译：

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Al2O3颗粒环境下2524-T3铝合金的疲劳裂纹扩展行为

研究了Al ₂ O _3的粉尘环境对2524-T3铝合金裂纹扩展行为的影响。结果表明，Al ₂ O _3的粉尘环境降低了合金的疲劳裂纹扩展速率（FCGR），特别是在低ΔK时。在疲劳加载过程中，许多Al ₂ O ₃颗粒沉积并粘附在裂纹中，从而促进了裂纹的闭合，而随着ΔK的增加，这种作用逐渐减弱。沉积的Al ₂ O ₃颗粒在裂纹尖端之前引起无序排列的滑带（SBs），这使裂纹路径偏转，使其在Al中更加曲折。₂ O ₃灰尘。