Microstructural mechanisms controlling fatigue crack growth in Al–Si–Mg cast alloys

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 468; pp. 237 - 245
• Main Authors: Lados, Diana A., Apelian, Diran, Jones, Peggy E., Major, J. Fred
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 15.11.2007; Elsevier
• Subjects: Applied sciences; Crack closure; Exact sciences and technology; Fatigue crack growth mechanisms; Fracture toughness; Fractures; Hypoeutectic and eutectic cast Al–Si–Mg alloys; Long and small cracks; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Microstructure; Plastic zone; Threshold; Hypoeutectic and eutectic cast Al–Si–Mg alloys; Fatigue crack growth mechanisms; Microstructure; Long and small cracks; Crack closure; Threshold; Fracture toughness; Plastic zone; Propagation velocity; Silicon alloy; Roughness; Crack closure effect; Aluminium alloy; Cast alloy; Dendrite; Fatigue crack; Crack propagation; Plasticity zone; Short crack; Hypoeutectic and eutectic cast Al-Si-Mg alloys; Magnesium alloy; Crack tip; Fractography

Fatigue crack growth behavior of long and small cracks was investigated for hypoeutectic and eutectic Al–Si–Mg cast alloys. Crack growth response in the near-threshold regime and Regions II and III was related to microstructural constituents namely primary α-Al dendrites and volume fraction and morp...