The influence of precipitation on plastic deformation of Al–Cu–Li alloys

Deschamps, A.; Decreus, B.; Geuser, F. de; Dorin, Thomas; Weyland, Matthew

doi:10.1016/j.actamat.2013.03.015

Cited by 247 publications

(94 citation statements)

References 27 publications

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“…Nonetheless, the disappearance of plastic instability in these alloys usually occurs in the underaged states [22,38,62] and can be attributed to the precipitation of more potent strengthening precipitates such as T 1 and S 0 . When strengthening from these phases becomes dominant, the order hardening mechanism and the pseudo-locking mechanism described above will be suppressed.…”

Section: Discussionmentioning

confidence: 98%

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New insights into plastic instability in precipitation strengthened Al–Li alloys

Ovri

Lilleodden

2015

Acta Materialia

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A mechanistic model that describes the microscopic mechanisms underlying plastic instability in precipitation strengthened Al-Li based alloy systems is proposed in this work. The model is based on experimental observations from high resolution nanoindentation tests and transmission electron microscopy (TEM) based methods, including in situ TEM tensile straining. These experiments show that dynamic strain aging (DSA), which is widely accepted as the underlying mechanism for plastic instability, cannot sufficiently account for the occurrence of plastic instability in Al-Li based alloy systems. It is proposed that an altogether different mechanism controls plastic instability, namely a diffusion-controlled pseudo-locking mechanism that accompanies order hardening. This mechanism does not require the concurrent operation of DSA by Li, which may be a nonviable mechanism given the low binding energy of Li to dislocation cores, for plastic instability to occur.

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Section: Discussionmentioning

confidence: 98%

“…On the other hand, the wavy and heterogeneous nature of slip in the NA temper suggests that a mechanism other than order hardening is prevalent. Recent reports associate the high yield strength in the NA temper with the presence of Cu-rich clusters [38].…”

Section: Precipitate Shearingmentioning

confidence: 99%

New insights into plastic instability in precipitation strengthened Al–Li alloys

Ovri

Lilleodden

2015

Acta Materialia

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“…The dispersion strengthening associated with these plates can be even less than the dispersion strengthening attributed to the θ 0 -phase [19]. In general, the effect of the T8 process on the precipitation and mechanical properties strongly depends on the alloy and pre-strain [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Effect of pre-straining on the aging behavior and mechanical properties of an Al–Cu–Mg–Ag alloy

Газизов

Kaibyshev

2015

Materials Science and Engineering: A

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a b s t r a c tThe effects of cold deformation prior to aging on the precipitation behavior, microstructure and mechanical properties of an Al-5.6Cu-0.72 Mg-0.5Ag-0.32Mn-0.17Sc-0.12Zr (in wt%) alloy were investigated. Pre-straining disrupts the formation of Mg-Ag co-clusters, modifying the normal precipitation sequence. A strong increase in the dislocation density by a factor of 100 leads to a $ 40% decrease in the number density, N V , of the Ω-phase at pre-strains of εZ1% (εZ 0.01). The aspect ratios of the platelets in this phase increased from $ 21 to $ 42 after a negligible pre-strain of r1% (ε r0.01) and further decreased to $ 25 in the pre-strain interval of 1-80% (ε $ 0.01-1.61). In addition, the nucleation of the Cu-rich θ 0 -phase occurs on dislocations. The heterogeneous nucleation of the thick Ω-phase particles with low aspect ratios ( $ 12) and equiaxed particles of S-phase with dimensions r5 nm on the deformation-induced boundaries was found. After peak aging, the yield stress (YS) and ultimate tensile strength (UTS) increased from 4787 4 MPa and 522 78 MPa for the as-quenched alloy to 516 7 4 MPa and 568 7 6 MPa in the longitudinal and 5547 5 MPa and 601 73 MPa in the transversal directions, respectively, for the alloy subjected to pre-straining with a rolling reduction of 80% (ε $ 1.61). Cold rolling prior to aging induces the anisotropy in mechanical behavior through the formation of deformation bands.

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“…Then, the present effect is quite probably induced by the slip irreversibility due to sheared precipitates as reported in Ref. [43].…”

Section: Elastoplastic Transitionmentioning

confidence: 83%

“…This effect is due to the slip irreversibility phenomena already mentioned in Refs. [10,12,43]. With a classical version of the kinematic hardening this effect cannot be modelled because by increasing the backstress as in the experiments the hardening slope would become too high compared to experimental one.…”

Section: Elastoplastic Transitionmentioning

confidence: 86%

Cyclic behaviour of a 6061 aluminium alloy: Coupling precipitation and elastoplastic modelling

et al. 2015

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The influence of precipitation on plastic deformation of Al–Cu–Li alloys

Cited by 247 publications

References 27 publications

New insights into plastic instability in precipitation strengthened Al–Li alloys

New insights into plastic instability in precipitation strengthened Al–Li alloys

Effect of pre-straining on the aging behavior and mechanical properties of an Al–Cu–Mg–Ag alloy

Cyclic behaviour of a 6061 aluminium alloy: Coupling precipitation and elastoplastic modelling

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