Effect of artificial aging on the fatigue crack propagation resistance of 2000 series aluminum alloys

Bray, G. H.; Glazov, M.V.; Rioja, R. J.; Li, D; Gangloff, Richard P.

doi:10.1016/s0142-1123(01)00159-1

Cited by 75 publications

(43 citation statements)

References 16 publications

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“…However, in 2xxx aluminium alloys, fatigue crack propagation resistance is known to decrease with significant artificial ageing [3]. The specific fatigue behaviour of low solute, artificially aged 2xxx alloys is largely unknown whereas the fatigue behaviour of naturally aged 2xxx aluminium alloys has been extensively studied (see e.g.…”

Section: Introductionmentioning

confidence: 99%

Influence of grain structure and slip planarity on fatigue crack growth in low alloying artificially aged 2xxx aluminium alloys

Kamp

Gao

Starink

et al. 2007

International Journal of Fatigue

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The fatigue crack growth behaviour under constant amplitude loading of three low alloying artificially aged 2xxx aluminium alloys with distinct microstructures is analysed. Fatigue crack growth tests show a correlation between fatigue performance and the occurrence of crack closure. Fractography and fracture surface measurements show that rougher surfaces give higher closure levels suggesting a dominating influence of roughness induced crack closure in these alloys. The relationship between the crack path and the microstructure, i.e. grain structure and slip planarity, is assessed semi-quantitatively. A criterion to evaluate the propensity for slip band formation is derived and reasonable correlation is found between the fatigue fracture behaviour of the three alloys and this criterion.

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Section: Introductionmentioning

confidence: 99%

Influence of grain structure and slip planarity on fatigue crack growth in low alloying artificially aged 2xxx aluminium alloys

Kamp

Gao

Starink

et al. 2007

International Journal of Fatigue

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“…The alloy achieves its maximum hardness at 140 °C when aged for 12 or 10 h. Thereafter, a decrease occurs as the time is increased. An account for increase of the hardness values can be explained by the solubility of MgZn 2 that was formed during the T6 treatment, increasing markedly with solution treatment resulting in a higher amount of dissolved MgZn 2 in aluminum matrix [21][22][23] . During quenching, this Mg-Zn was kept in a solution.…”

Section: Resultsmentioning

confidence: 99%

Effect of Quenching Rate and Pre-strain on the Strain Ageing Behaviors of 7075 Aluminum Alloys

Kaçar

Güleryüz

2015

Mat. Res.

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The mechanical properties of aluminum alloys are strongly dependent on the thermo-mechanical process so, the strain ageing behavior of 7075 Al-alloy was investigated in this study. A set of test pieces was solution heat treated at 480 °C for 2 h, water quenched (SHTWQ) then pre-strained for 8% in tension. The test samples were aged at 140 °C for 0.5, 1,2,3,4,6,8,10,12,24, 48, 72 and 96 h in a furnace. The other set of test samples were solution heat treated at 480 °C for 2 h, quenched in sand (SHTSQ) then pre-strained for 8% in tension. They were also aged at 140 °C for same intervals. The effect of strain ageing, on the mechanical properties of Al-alloy, was investigated by mean of hardness, and tensile tests. The results shown that, the quenching rate after solution heat treatment, ageing time and temperature, as well as pre-strain, play a very important role in the precipitationhardening associated with ageing process of the 7075 Al-alloy.

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“…7 [18]. At low ΔK, materials heat treated at 150°C/12h yielded slightly better FCG resistance than those aged at 190°C/12h.…”

Section: Mechanical Properties After Simulated Age Formingmentioning

confidence: 95%

Relations between microstructure, precipitation, age-formability and damage tolerance of Al–Cu–Mg–Li (Mn, Zr, Sc) alloys for age forming

Starink

Gao

Kamp³

et al. 2006

Materials Science and Engineering: A

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Age forming of Al based alloys for damage tolerant applications requires an alloy with good age formability and good post-forming mechanical properties. To investigate optimisation of this balance, several newly designed Al-Cu-Mg-Li (Mn,Zr,Sc) alloys were subjected to artificial ageing representative of age-forming. It was seen that combinations of yield strength and fatigue crack growth resistance could be achieved that are at least comparable to the incumbent damage tolerant material for such applications, whilst creep rates at the ageing temperatures applied were better than those achieved in commercially applied age forming processes of heat treatable Al based alloys. Coarse grain structure and high Li content are associated with good fatigue crack growth resistance but reduce age formability. The underlying physical aspects responsible for the balance between creep rates and resulting properties are discussed. The metallurgical and micromechanical mechanisms analysed and discussed provide a framework for optimisation of composition and forming conditions for age forming of damage tolerant parts.

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Effect of artificial aging on the fatigue crack propagation resistance of 2000 series aluminum alloys

Cited by 75 publications

References 16 publications

Influence of grain structure and slip planarity on fatigue crack growth in low alloying artificially aged 2xxx aluminium alloys

Influence of grain structure and slip planarity on fatigue crack growth in low alloying artificially aged 2xxx aluminium alloys

Effect of Quenching Rate and Pre-strain on the Strain Ageing Behaviors of 7075 Aluminum Alloys

Relations between microstructure, precipitation, age-formability and damage tolerance of Al–Cu–Mg–Li (Mn, Zr, Sc) alloys for age forming

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