Abstract Environment Induced Cracking (EIC) has been observed in three dimensions (3D) at high spatial and temporal resolution for AA5083 H131 alloy using in situ synchrotron X-ray CT. The initiation of EIC cracks occurred in humid air at ∼0.5σy and started from corrosion sites associated with intermetallic particle clusters. Time-resolved monitoring of the crack growth confirmed cracks grow below threshold KIEIC and are susceptible to arrest under fixed displacement conditions. Even when the cracks exceed threshold KIEIC and enter sustained propagation they exhibit very uneven growth rates. Failure occurs when the K of the largest crack exceeds the fracture toughness KIC.

中文翻译：

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环境诱导裂纹 (EIC) 的萌生、扩展和失效：AA5083 H131 的 3D 原位延时研究

摘要 已使用原位同步加速器 X 射线 CT 在 AA5083 H131 合金的高空间和时间分辨率下在三个维度 (3D) 上观察到环境诱导开裂 (EIC)。EIC 裂纹的萌生发生在约 0.5σy 的潮湿空气中，并从与金属间粒子簇相关的腐蚀位置开始。裂纹扩展的时间分辨监测证实裂纹扩展到低于阈值 KIEIC 并且在固定位移条件下易于停止。即使当裂纹超过阈值 KIEIC 并进入持续扩展时，它们也会表现出非常不均匀的增长速度。当最大裂纹的 K 超过断裂韧性 KIC 时，就会发生失效。