The role of plastic deformation on the competitive microstructural evolution and mechanical properties of a novel Al–Li–Cu–X alloy

Gable, Brian M.; Zhu, A. W.; Csontos, A.; Starke, E.A.

doi:10.1016/s1471-5317(00)00002-x

Cited by 228 publications

(88 citation statements)

References 18 publications

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“…[6,7] For C47A-T8, the precipitate microstructure was not characterized; however, a peak-aged alloy of similar composition (Al-2.7Cu-1.8Li-0.6Zn-0.3Mg-0.3Mn-0.08Zr, wt pct) contained d¢ (Al 3 Li), T 1 (Al 2 CuLi), and h¢ (Al 2 Cu). [33] These two-alloy microstructures were selected to favor intense slip localization, produced by two different fine-scale microstructures.…”

Section: Methodsmentioning

confidence: 99%

Crystallography of Fatigue Crack Propagation in Precipitation-Hardened Al-Cu-Mg/Li

Agnew

Gangloff

2007

Metall Mater Trans A

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A combined electron backscatter diffraction (EBSD)/stereology method successfully quantifies the orientation of fatigue crack surfaces for Al-Li-Cu and Al-Cu-Mg alloys stressed at low DK, in which deformation is localized in slip bands and cracking is highly faceted. The method orients features as small as~1 lm in complex microstructures. Vacuum fatigue facets align within 15 deg of up to four variants of {111} slip planes, governed by the distribution of crack tip resolved shear stress. The small fraction of precisely oriented {111} facets suggests that cracking involves complex intraband and multiple-band interface paths. Water vapor and NaCl solution affect a similar dramatic change in the crack path; near-{111} facets are never observed, at odds with mechanisms for H-enhanced slip localization and associated slip band cracking. Rather, two environmental crack facet morphologies, broad flat and repeating step, exhibit a wide range of orientations between {001} and {110}, as governed by crack tip resolved normal stresses. The repetitive stepped facets appear to contain areas parallel to {100}/{110} on thẽ 1-lm scale, coupled with surface curvature consistent with a mechanism of discontinuous fatigue crack growth involving H-enhanced {100}/{110} cleavage and intermingled crack tip plasticity. Broad-flat faceted regions are parallel to a variety of planes, consistent with a mechanism combining high crack tip tensile stresses and H trapped at the dislocation structure from cyclic deformation, within 1 lm of the crack tip.

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Section: Methodsmentioning

confidence: 99%

Crystallography of Fatigue Crack Propagation in Precipitation-Hardened Al-Cu-Mg/Li

Agnew

Gangloff

2007

Metall Mater Trans A

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“…The precipitates appearing during the creep-ageing of both WQ and T34 materials should be similar, mainly including Cu clusters, θ', S and T1 [11,32,33]. However, the evolution progress of those precipitates will show differences because of the lacking of natural-ageing and pre-stretch in the WQ material.…”

Section: Effect Of Initial Temper On Creep-ageing Behaviourmentioning

confidence: 99%

“…Kumar et al [8] have investigated the ageing process of Al-Cu-Li alloys with initial tempers of T3 and T4 and concluded that both precipitates from natural ageing and dislocations from pre-stretch in the initial temper would influence the subsequent ageing process. In addition, it has been reported that dislocations induced by the pre-stretch facilitate the nucleation of T1 precipitates, thus accelerating ageing progress and promoting strength [10,11]. By contrast, little research has been published on the creep behaviour of Al-Cu-Li alloys.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of tension and compression creep-ageing behaviour of AA2050 with different initial tempers

Shi

Lin

et al. 2016

Materials Science and Engineering: A

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“…[16,38,[45][46][47][48] Typically, this involves the introduction of heterogeneous nucleation sites, such as matrix dislocations or fine solute clusters or zones. Accordingly, these processing changes affect the resulting precipitate density, aging kinetics, and competitive precipitation between phases and, ultimately, the mechanical properties of the material.…”

Section: The Role Of Heterogeneous Nucleation Sites On Competitivementioning

confidence: 99%

Alloy development for the enhanced stability of Ω precipitates in Al-Cu-Mg-Ag alloys

Gable

Shiflet

Starke

2006

Metall Mater Trans A

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The coarsening resistance and thermal stability of several V plate-dominated microstructures were controlled through altering the chemistry and thermomechanical processing of various Al-Cu-Mg-Ag alloys. Quantitative comparisons of V nucleation density, particle size, and thermal stability were used to illustrate the effects of alloy composition and processing conditions. The long-term stability of V plates was found to coincide with relatively high levels of silver and moderate magnesium additions, with the latter limiting the competition for solute with S-phase precipitation. This analysis revealed that certain microstructures initially dominated by V precipitation were found to remain stable through long-term isothermal and double-aging heat treatments, which represents significant improvement over the previous generation of Al-Cu-Mg-Ag alloys, in which V plates dissolved sacrificially after long aging times. The quantitative precipitate data, in conjunction with a thermodynamic database for the aluminum-rich corner of the Al-Cu-Mg-Ag quaternary system, were used to estimate the chemistry of the a/V-interphase boundary. These calculations suggest that silver is the limiting species at the a/V interfacial layer and that V plates form with varying interfacial chemistries during the early stages of artificial aging, which is directly related to the overall stability of certain plates.

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The role of plastic deformation on the competitive microstructural evolution and mechanical properties of a novel Al–Li–Cu–X alloy

Cited by 228 publications

References 18 publications

Crystallography of Fatigue Crack Propagation in Precipitation-Hardened Al-Cu-Mg/Li

Crystallography of Fatigue Crack Propagation in Precipitation-Hardened Al-Cu-Mg/Li

Experimental investigation of tension and compression creep-ageing behaviour of AA2050 with different initial tempers

Alloy development for the enhanced stability of Ω precipitates in Al-Cu-Mg-Ag alloys

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