Fatigue crack propagation in ultrafine grained Al–Mg alloy

The fatigue crack growth rates in ultrafine grained (UFG) Al–7.5Mg were investigated and were compared to those observed in powder-metallurgy (P/M) Al–7Mg and ingot-metallurgy (I/M) Al–7Mg. Fatigue crack growth rates in UFG Al–7.5Mg are significantly higher than those of P/M Al–7Mg, which, in turn,...

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Bibliographic Details
Published in:International journal of fatigue 2005-10, Vol.27 (10), p.1164-1169
Main Authors: Pao, P.S., Jones, H.N., Cheng, S.F., Feng, C.R.
Format: Article
Language:English
Subjects:
Aluminum
Applied sciences
Exact sciences and technology
Fatigue
Fatigue crack growth
Fatigue crack growth threshold
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Microstructure
Ultrafine grained material
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Summary:The fatigue crack growth rates in ultrafine grained (UFG) Al–7.5Mg were investigated and were compared to those observed in powder-metallurgy (P/M) Al–7Mg and ingot-metallurgy (I/M) Al–7Mg. Fatigue crack growth rates in UFG Al–7.5Mg are significantly higher than those of P/M Al–7Mg, which, in turn, are significantly higher than those of I/M Al–7Mg. The fatigue crack growth threshold is the lowest in the UFG Al–7.5Mg, followed by P/M Al–7Mg, and is the highest in I/M Al–7Mg. The higher fatigue crack growth rates and lower thresholds in UFG Al–7.5Mg may be attributed to the much smoother fracture surface morphology and lower roughness-induced crack closure and crack deflection.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2005.06.027