Design and manufacture of a superplastic-formed aluminum-lithium component

Henshall, C. A.; Wadsworth, J.; Reynolds, M.J.; Barnes, A.J.

doi:10.1016/0261-3069(87)90082-3

Cited by 13 publications

(6 citation statements)

References 5 publications

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“…The details of material preparation, the thermomechanical processing (TMP) of 2090 sheet to obtain superplasticity, and the actual forming process have been described in detail [Henshall, 1987] and are only reviewed briefly here since all thermomechanical processing took place before the material was received. The tensile behavior of TMP 2090-T6 at cryogenic temperature has also been reported previously [Glazer, Morris and Nieh, 1987].…”

Section: Thennomechanically-processed Superplastic 2090-t6mentioning

confidence: 99%

“…The part was formed by using gas pressure to form the sheet into a bubble into which a male tool was inserted. The pressure was then gradually reversed to form the sheet around the top of the tool [Henshall et al, 1987].…”

Section: Thennomechanically-processed Superplastic 2090-t6mentioning

confidence: 99%

“…All material (fomied or not) was solution heat treated 0.5 hours, quenched in 5% glycol in cold water, and aged to approximately peak strength at 190°C (375°F) for 8 hours and air cooled. The choice of aging time and characterization of the initial microstructure have been described by Henshall [1987] and by Glazer [1987]. An optical micrograph showing the fme grain size of the material after thermomechanical processing (2-5 JJ.m) is shown in Figure 2.4.…”

Section: Thennomechanically-processed Superplastic 2090-t6mentioning

confidence: 99%

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The strength-toughness combination of the aluminum-lithium alloys 2090 and 2091 at cryogenic temperatures

Glazer¹

1989

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The strength-toughness combination of the aluminum-lithium alloys 2090 (nominal composition Al-2.7 Cu-2.2 Li-0.1 Zr in wt. %) and 2091 (Al-2.2 Cu-2.0 Li-1.5 Mg-0.1 Zr) plate at cryogenic temperatures was investigated. Aluminum-lithium alloys have lower density and higher stiffness than conventional aluminum alloys and were developed for aircraft applications. This study was motivated by the possibility of using aluminumlithium alloys for cryogenic tankage of spacecraft, an application in which light weight, weldability and good cryogenic mechanical properties are at a premium. Alloy 2090-T81 has a strength-toughness combination that improves with decreasing temperature between 300 and 4 K under some conditions. This improvement is accompanied by an increase in the tensile elongation and strain hardening rate, but the large increase in fracture toughness is not reflected in the primary fracture mode. The goal of this study was to develop an understanding of the mechanisms responsible for the increase in fracture toughness at cryogenic temperatures. The mechanical properties of alloy 2090 in other metallurgical conditions and a second alloy, 2091, were also considered.

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Section: Thennomechanically-processed Superplastic 2090-t6mentioning

confidence: 99%

Section: Thennomechanically-processed Superplastic 2090-t6mentioning

confidence: 99%

Section: Thennomechanically-processed Superplastic 2090-t6mentioning

confidence: 99%

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The strength-toughness combination of the aluminum-lithium alloys 2090 and 2091 at cryogenic temperatures

Glazer¹

1989

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“…Its application makes it possible to reduce the number of technological operations, to carry out the forming process with low stresses and to decrease the consumption of materials. The structures produced by this method have smooth surfaces and exhibit only slight surface deviations from the desired geometry, which is of particular importance for thickness variation minimization and for high-precision filling of dies [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Statistical Crystal Plasticity Model Advanced for Grain Boundary Sliding Description

2020

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Grain boundary sliding is an important deformation mechanism, and therefore its description is essential for modeling different technological processes of thermomechanical treatment, in particular the superplasticity forming of metallic materials. For this purpose, we have developed a three-level statistical crystal plasticity constitutive model of polycrystalline metals and alloys, which takes into account intragranular dislocation sliding, crystallite lattice rotation and grain boundary sliding. A key advantage of our model over the classical Taylor-type models is that it also includes a consideration of grain boundaries and possible changes in their mutual arrangement. The constitutive relations are defined in rate form and in current configuration, which makes it possible to use additive contributions of intragranular sliding and grain boundary sliding to the strain rate at the macrolevel. In describing grain boundary sliding, displacements along the grain boundaries are considered explicitly, and changes in the neighboring grains are taken into account. In addition, the transition from displacements to deformation (shear) characteristics is done for the macrolevel representative volume via averaging, and the grain boundary sliding submodel is attributed to a separate structural level. We have also analyzed the interaction between grain boundary sliding and intragranular inelastic deformation. The influx of intragranular dislocations into the boundary increases the number of defects in it and the boundary energy, and promotes grain boundary sliding. The constitutive equation for grain boundary sliding describes boundary smoothing caused by diffusion effects. The results of the numerical experiments are in good agreement with the known experimental data. The numerical simulation demonstrates that analysis of grain boundary sliding has a significant impact on the results, and the multilevel constitutive model proposed in this study can be used to describe different inelastic deformation regimes, including superplasticity and transitions between conventional plasticity and superplasticity.

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“…After 1945, the papers on the superplasticity phenomenon have appeared occasionally. The major increase in the interest of superplasticity was noted from 1962 onwards [13,28]. In 1967, Lee and Backofen achieved the elongation of >1000% for Ti-6wt%Al-4wt%V (Ti-6/4) [37].…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Superplastic Punchless Deep Drawing Process of a Ti-6Al-4V Titanium Alloy

Skrzat¹,

Wójcik²

2020

Adv. Sci. Technol. Res. J.

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The numerical results of superplastic punchless deep drawing of the Ti-6Al-4V titanium alloy were presented in this paper. The material behavior subjected to the forming process was characterized by deformation-microstructure constitutive equations including the grain growth. Superplastic stress-strain characteristics used in the numerical simulations were computed with the application of authorial program. The explicit integration scheme is used in solving differential equations. The numerical simulations of the super-elastic deep drawing were made with finite element method analysis. The von Mises stress distribution in the blow-forming process was obtained. The possible faults of extrusions caused by the improper load history as well as unsuitable pressure were also presented in this paper. The numerical simulations included in this research allow for the proper choice of material and drawing parameters which can help to optimize the superplastic forming process.

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Design and manufacture of a superplastic-formed aluminum-lithium component

Cited by 13 publications

References 5 publications

The strength-toughness combination of the aluminum-lithium alloys 2090 and 2091 at cryogenic temperatures

The strength-toughness combination of the aluminum-lithium alloys 2090 and 2091 at cryogenic temperatures

Statistical Crystal Plasticity Model Advanced for Grain Boundary Sliding Description

Numerical Modeling of Superplastic Punchless Deep Drawing Process of a Ti-6Al-4V Titanium Alloy

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