The precipitation behavior of an Al–Cu–Mg–Ag alloy under ECAP

Газизов, М. Б.; Kaibyshev, Rustam

doi:10.1016/j.msea.2013.09.021

Cited by 31 publications

(37 citation statements)

References 37 publications

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“…However, a similar process of phase transformation of the Ω-phase was observed under plastic deformation at 250-300 1C [7,25].…”

Section: Effect Of Pre-straining On the Precipitation Sequencesupporting

confidence: 61%

“…The microstructure of the alloy in as-quenched condition has been described in detail in previous works [7,24,25]. Boundary particles of the primary θ-phase and ternary W-phase play no role in dispersion hardening.…”

Section: Deformation Microstructurementioning

confidence: 99%

“…Age-hardenable aluminum alloys belonging to the Al-Cu-MgAg system are used in the aerospace industry due to their attractive combination of high specific strength, good fracture toughness and enhanced creep resistance attributed to the highly efficient strengthening by the Ω-phase [1][2][3][4][5][6][7][8][9][10]. This phase is a coherent modification of the equilibrium θ-phase (Al 2 Cu) that forms as a uniform dispersion of thin, hexagonal plates with large aspect ratios (diameter/thickness) on the {111} α habit planes [2][3][4][5][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…The edges of the plates can lose coherency through Ω plate thickening [4]. The precipitation sequence of Al-Cu-Mg-Ag can be summarized as follows [4,6,7,11]: SSSS-Guinier-Preston GP ð Þzones-Ω À phase-θ À phase…”

Section: Introductionmentioning

confidence: 99%

“…These aggregates combine with Cu to form {111} α GP zones that continuously evolve into the Ω-phase through direct allotropic transformation [11]. In Stage III, the Ω-phase is replaced by the θ-phase, mainly through the separate nucleation and growth of the θ-phase at a very slow rate under static aging [13] or the in situ allotropic transformation Ω-phase-θ-phase under plastic deformation at intermediate temperatures [7]. Most of the θ-phase particles nucleate homogenously or on grain boundaries.…”

Section: Introductionmentioning

confidence: 99%

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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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“…However, a similar process of phase transformation of the Ω-phase was observed under plastic deformation at 250-300 1C [7,25].…”

Section: Effect Of Pre-straining On the Precipitation Sequencesupporting

confidence: 61%

Section: Deformation Microstructurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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The effect of second-phase particles on grain refinement during equal-channel angular pressing in an Al–Cu–Mg–Ag alloy

2014

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In this work, the effect of second-phase particle distributions on grain refinement during equal-channel angular pressing (ECAP) was studied at 250°C by comparing the microstructural evolution in an Al-Cu-Mg-Ag alloy processed in three different states. The first state (QA) was obtained by water quenching, and the second state was obtained by overaging at 250°C. Both these states contain fine dispersions of X-phase shearable plates with coherent and/or semi-coherent interfaces. The QA plate thickness prior to ECAP was higher by a factor of four than in the OA. The third alloy (HA) contained relatively coarse non-deformable particles of thermodynamically equilibrium phases with incoherent interfaces. It was shown that distribution of the secondary phase particles strongly affects the continuous dynamic recrystallization through the initial formation of geometrically necessary boundaries (GNBs), pinning dislocations and deformationinduced boundaries. The formation of a fully recrystallized structure occurs at the highest rate in the HA material with rounded grains because of 3D networks of low-angle boundaries (LABs) evolve at e * 1 due to the concurrent formation of GNBs belonging to two families. In the QA and OA materials, the shearing of the X-phase plates with the coherent interfaces leads to the strong localization of dislocation slip and the dominant formation of one family of GNBs. Nonshearable nanoscale dispersoids hinder the formation of 3D arrays for GNBs. As a result, only a partially recrystallized structure evolves, even at strains of up to e * 12.

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Microstructure and mechanical properties of two-stage aged Al–Cu–Mg–Ag–Sm alloy

Zhang

Xiao

et al. 2018

Rare Met.

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The precipitation behavior of an Al–Cu–Mg–Ag alloy under ECAP

Cited by 31 publications

References 37 publications

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

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

The effect of second-phase particles on grain refinement during equal-channel angular pressing in an Al–Cu–Mg–Ag alloy

Microstructure and mechanical properties of two-stage aged Al–Cu–Mg–Ag–Sm alloy

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