Texture and anisotropy in Al-Li alloy 2195 plate and near-net-shape extrusions

Hales, Stephen J.; Hafley, Robert A.

doi:10.1016/s0921-5093(98)00834-x

Cited by 66 publications

(25 citation statements)

References 8 publications

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“…Experimental observations on rolled [1,3,4] and extruded [5] engineering alloys show that crystallographic and morphological textures can induce strongly anisotropic damage growth and fracture behavior. Texture has also been found to result in anisotropic spallation of low-symmetry metals under shock loading [6,7].…”

Section: Introductionmentioning

confidence: 99%

Dilatational viscoplasticity of polycrystalline solids with intergranular cavities

Lebensohn

Idiart

Castañeda

et al. 2011

Philosophical Magazine

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We propose constitutive models for polycrystalline aggregates with intergranular cavities and test them against full-field numerical simulations. Such conditions are prevalent in many engineering applications and failure of metallic components (e.g. HIPing and other forming processes, spallation under dynamic loading conditions, etc.), where the dilatational effects associated with the presence of cavities must be accounted for, and standard polycrystalline models for incompressible plasticity are not appropriate. On the other hand, it is not clear that the use of porous plasticity models with isotropic matrix behavior is relevant, particularly, when large deformations can lead to significant texture evolution and therefore to strong matrix anisotropy. Of course, finite strains can also lead to significant changes in the porosity and pore shape, resulting in additional anisotropy development. In this work, we make use of 'variational linearcomparison' homogenization methods to develop constitutive models simultaneously accounting for texture of the matrix, porosity and average pore shape and orientation. The predictions of the models are compared with full-field numerical simulations based on fast Fourier transforms to study the influence of different microstructural features (e.g. overall porosity, texture of the matrix phase, single-crystal anisotropy, etc.) and type of loading (triaxiality) on the dilatational viscoplastic behavior of voided polycrystals. The results are also compared with the predictions of isotropic-matrix porous plasticity models to assess the effect of the possible matrix anisotropy in textured samples.

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Section: Introductionmentioning

confidence: 99%

Dilatational viscoplasticity of polycrystalline solids with intergranular cavities

Lebensohn

Idiart

Castañeda

et al. 2011

Philosophical Magazine

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“…[22] aluminum alloy. [1][2][3][4] The effects of composition, [1,5,6] aging Although the microhardness, [17] yield strength, [20] fracture conditions, [3,7,8] and processing [4,7,9] on the microstructure toughness, [19] and corrosion behavior [23] of the welded joints and tensile properties of this alloy have been extensively have been reported, the data on the mechanical properties studied, and the high strength and stiffness of the alloy of the HAZ are very limited. In particular, the fatigue behavhave been attributed primarily to the precipitation of finely ior of the HAZ and welded joints of the 2195 alloy has not distributed T 1 (Al 2 CuLi) phase.…”

Section: Introductionmentioning

confidence: 99%

Effects of welding and weld heat-affected zone simulation on the microstructure and mechanical behavior of a 2195 aluminum-lithium alloy

Chen

Chaturvedi

2001

Metall Mater Trans A

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The microstructures, tensile properties, and fatigue properties of a 2195-T8 Al-Li alloy subjected to a weld heat-affected zone (HAZ) simulation and gas-tungsten-arc (GTA) welding using a 4043 filler metal, with and without a postweld heat treatment, were studied. The principal strengthening precipitate in the T8 base alloy was the T 1 (Al 2 CuLi) phase. The HAZ simulation resulted in the dissolution of T 1 precipitates and the formation of T B (Al 7 Cu 4 Li) phase, Guinier-Preston (G-P) zones, and ␦ Ј (Al 3 Li) particles. When the HAZ simulation was conducted at the highest temperature of 600 ЊC, microcracks and voids also formed along the grain boundaries (GBs). In the specimens welded with the 4043 alloy, T (AlLiSi) phase was found to form in the fusion zone (FZ). An elongated T B phase and microcracks were observed to occur along the GBs in the HAZ close to the FZ interface. The T 1 phase was not observed in the HAZ. The postweld heat treatment resulted in the spheroidization of primary T phase and the precipitation of small secondary T particles in the FZ, the dissolution of T B phase, and the reprecipitation of the T 1 phase in the HAZ. Both the HAZ simulation and welding gave rise to a considerable decrease in the hardness, tensile properties, and fatigue strength. The hardness in the FZ was lower than that in the HAZ. Although the postweld heat treatment improved both the hardness and tensile properties due to the reprecipitation of T 1 phase in the HAZ and a smaller interparticle spacing in the FZ, no increase in the fatigue strength was observed because of the presence of microcracks in the HAZ.

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“…It has been reported that the elongation and yield strength are the most sensitive in-plane anisotropic tensile properties, even in crystallographically symmetric FCC metals, such as Al, Al-Li and Nimonic alloys, and such unexpected in-plane anisotropy can be attributed to strong crystallographic texture and grain fibering [6][7][8][9][10][11][12][13][14][15][17][18][19][20][21]. The Nimonic C-263 alloy, exhibits the highest and lowest values of r Y in L and T directions in cold rolled and solutiontreated condition [2][3][4].…”

Section: Tensile Properties and In-plane Anisotropymentioning

confidence: 99%

In-plane anisotropy and tensile deformation behaviour of aluminium alloy AA 2014 forge plates

2019

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Plastic flow behaviour and fracture mechanism of aluminium alloy AA 2014 forged plates under tensile loading conditions are investigated and the results obtained are presented and discussed in the present study. The effects of heat treatment (namely, solution treatment and artificial ageing) on micro-structural homogeneity, tensile behaviour and nature of fracture were studied using hardness, tensile, optical and scanning electron microscopy methods. Experimental engineering stress-engineering strain and true stress-true strain data of the aluminium alloy AA 2014 in different ageing conditions have been analysed using Hollomon, Ludwik and Ludwigson plastic flow relationships. The alloy is found to exhibit moderate degree of in-plane anisotropy and anisotropic index. Further, the alloy in both solution-treated and aged conditions exhibits three different stages of strain-hardening rate and the highest strain-hardening rate occurs at regions of lower strain both in solution-treated and peak-aged conditions. It is also observed that the longitudinal specimen (L parallel to forging direction) exhibits higher strain hardening, while the specimen with T orientation exhibits lowest strain-hardening rates both in solution-treated and aged conditions. The alloy under study in all the heat treatment conditions exhibits ductile fracture mechanism with higher density of uniformly distributed macro-and micro-dimples.Keywords. Aluminium alloy AA 2014; in-plane anisotropy; strain hardening; fracture mechanism; anisotropic index; plastic flow. Sådhanå (2019) 44:22 Ó Indian Academy of Sciences https://doi.org/10.1007/s12046-018-0994-8S adhana(0123456789().,-volV)FT3 ](0123456789().,-volV)

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Texture and anisotropy in Al-Li alloy 2195 plate and near-net-shape extrusions

Cited by 66 publications

References 8 publications

Dilatational viscoplasticity of polycrystalline solids with intergranular cavities

Dilatational viscoplasticity of polycrystalline solids with intergranular cavities

Effects of welding and weld heat-affected zone simulation on the microstructure and mechanical behavior of a 2195 aluminum-lithium alloy

In-plane anisotropy and tensile deformation behaviour of aluminium alloy AA 2014 forge plates

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