Fatigue Behavior of Aluminum Alloys

Aluminium alloys are prized for their high strength-to-weight ratio and corrosion resistance, yet their susceptibility to fatigue under cyclic loading remains a critical design consideration across industries. Fatigue damage initiates at microstructural defects—second-phase particles, grain boundaries or surface imperfections—and progresses through crack initiation, steady-state propagation and final rapid fracture. The growth rate of fatigue cracks is governed by applied stress intensity range, microstructure-induced crack-closure phenomena and environmental interactions. Alloy composition, heat treatment and thermo-mechanical processing establish grain size, crystallographic texture and precipitate distribution, all of which modulate crack-tip plasticity and closure mechanisms. For instance, fine equiaxed grains can retard crack progression in the Paris regime, while strong rolling textures may channel cracks along preferred orientations, accelerating growth. Recent advances in in situ imaging and high-resolution modelling have begun to elucidate how localised slip, roughness-induced closure and anisotropic hardening influence fatigue life. Understanding these interlinked factors is essential for optimising alloy design, manufacturing processes and maintenance protocols in sectors such as aerospace, automotive and renewable energy, where lightweight durability is paramount.

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Fatigue Behavior of Aluminum Alloys publication trend

The graph below shows the total number of articles in fatigue behavior of aluminum alloys across all publications each year (not limited to Nature Index journals).

Technical terms

Fatigue crack propagation: Progressive extension of a crack under cyclic stress, typically described by threshold and Paris regimes.

Texture: Preferred crystallographic grain orientation within a polycrystalline alloy, influencing anisotropic mechanical response.

Brass texture: A rolling-induced component in aluminium alloys characterised by {110}<112> orientation, affecting strength and crack paths.

P-texture: A deformation texture with grains aligning to a specific crystallographic axis, often enhancing crack-closure effects.

Roughness-induced crack closure (RICC): Mechanism by which surface roughness from fatigue striations reduces the effective crack-tip stress intensity range.

References

1. Damage Mechanisms and Anisotropy of an AA7010-T7452 Open-Die Forged Alloy: Fatigue Crack Propagation. Materials (2022).
2. Texture Evolution and Control of 2524 Aluminum Alloy and Its Effect on Fatigue Crack Propagation Behavior. Applied Sciences (2021).
3. P-Texture Effect on the Fatigue Crack Propagation Resistance in an Al-Cu-Mg Alloy Bearing a Small Amount of Silver. Materials (2018).