Dynamic Response and Microstructure Evolution of AA2219-T4 and AA2219-T6 Aluminum Alloys

Olasumboye, Adewale; Owolabi, Gbadebo; Odeshi, A.G.; Zeytinci, A.; Yılmaz, Nadir

doi:10.1007/s40870-018-0141-y

Cited by 10 publications

(7 citation statements)

References 31 publications

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“…Generally, aluminum alloys are considered strain rate insensitive within commonly tested conditions, which is either the low quasi‐static (less than 1 s −1 ) or high dynamic (higher than 1000 s −1 ) range at room temperature. [ 8,35 ] Literature reported range of the strain rate sensitivity parameter C generally falls within 0.001–0.04 for aluminum alloys. [ 36,37 ] In the calibrated material model in this study, parameter C is near the top of the reported range.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Behavior and Microstructure Evolution during Hot Torsion Deformation of Aluminum Alloy AA2219

Gilmore

Liu

2022

Adv Eng Mater

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This study comprehensively analyzes the mechanical behavior and microstructural evolution of aluminum alloy AA2219-T87 undergoing high deformation and strain rates at elevated temperatures via hot torsion tests. An integrated experimental and modeling approach is employed, where a finite element model (FEM) is developed with ABAQUS to address local deformation and nonuniform temperature distribution along the specimen gauge section. A Johnson-Cook constitutive material model is calibrated based on the calculated and measured torque curves at different conditions. The grain structure distribution is characterized through optical microscopy and electron backscatter diffraction (EBSD) analysis. Combined with the ABAQUS calculated local thermomechanical conditions, microstructure modeling, using established literature-based equations, is established to provide insights into grain size distribution and recrystallization mechanisms. The calibrated material constitutive model, recrystallization model, and grain size model can be utilized to model various manufacturing processes, which involve hot deformation of aluminum alloys in the intermediate strain rate range of 14-78 s À1 . The constitutive model shows adequate matching of the experimental torque curves at 400, 450, and 500 °C. The recrystallization prediction model functions at over 94% accuracy and the grain size model provides an average deviation between predicted and measured grain size reduction of 11.5%.

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Section: Resultsmentioning

confidence: 99%

Mechanical Behavior and Microstructure Evolution during Hot Torsion Deformation of Aluminum Alloy AA2219

Gilmore

Liu

2022

Adv Eng Mater

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“…The observed ASBs in aluminum alloys are commonly categorized into deformed bands including elongated grains and transformed bands formed by equiaxed ultrafine grains depending on the severity of loading [26]. Olasumboye et al [29] have recently investigated the dynamic response and microstructure evolution of AA2219-T4 and AA2219-T6 aluminum alloys. They characterized the plastic deformation of the T4 and the T6 tempered alloys by intense shear localization at 3500 s −1 strain rate leading to fracture.…”

Section: Introductionmentioning

confidence: 99%

High Strain Rate Behavior of Ultrafine Grained AA2519 Processed via Multi Axial Cryogenic Forging

Azimi

Owolabi

Fallahdoost

et al. 2019

Metals

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The present work deals with studies on the dynamic behavior of ultrafine grained AA2519 alloy synthesized via cryogenic forging (CF) and room temperature forging (RTF) techniques. A split-Hopkinson pressure bar was used to perform high strain rate tests on the processed samples and the microstructures of the samples were characterized before and after impact tests. Electron backscatter diffraction (EBSD) maps demonstrated a significant grain size refinement from ~740 nm to ~250 nm as a result of cryogenic plastic deformation showing higher dislocation densities and stored strains in the CF sample when compared to the RTF sample. This microstructure modification caused the increase of dynamic flow stress in this alloy. In addition, the aluminum matrix of the CF alloy is more densely populated with fragmented particles than the RTF alloy due to the heavier plastic deformation applied to the cryogenically forged alloy. The results obtained from the stress–strain curve for the RTF sample showed intense thermomechanical instabilities in the RTF sample which led to a severe thermal softening and the subsequent sharp drop in the flow stress. However, no significant decrease was observed in the stress–strain curve of the CF alloys with ultrafine grains which means that thermal softening would probably not be the most effective failure mechanism. Furthermore, higher level of sensitivity of CF alloys to strain rates was observed which is ascribed to transition of rate-controlling plastic deformation mechanisms. In the post-mortem microstructure investigation, deformed and transformed adiabatic shear bands (ASBs) were identified on the RTF alloy when the strain rate is over 4000 s−1 at which it had experienced a significant thermal softening. On the other hand, circular path and aligned split arcs are the various shapes of the deformed ASB seen at no earlier than 4500 s−1 in the CF alloys. This is associated with the crack failure caused by grain boundary sliding.

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“…The literature presents a wide range of research and results obtained from analyzes on the behavior of materials subjected to shock stresses. The analyzed materials are homogeneous metallic or non-metallic [1][2][3][4][5][6], composite or fabric of different types of natural or artificial fibers [7][8][9][10][11]20]. Also, the penetrator may be a solid of various geometry [12,13], it may be a shock wave propagated through a gaseous [14,15], liquid [16,17] or solid [12] medium, a molten state, a plasma state material [18], or a laser wave [19,20].…”

Section: Introductionmentioning

confidence: 99%

“…Last but not least, the penetrator is a shock wave propagating in the gaseous medium [18] or liquid [10,16] studies assessing the behavior of the structure and obtaining conclusions about the degree of protection provided by it. A separate class of studies addresses structural changes in solid or gaseous target material by impact with a laser wave [5,6,9] in order to identify new processing technologies.…”

Section: Introductionmentioning

confidence: 99%

Study of structural changes in metallic materials subjected to shock stress

Cristea

Bibu

2018

MATEC Web Conf.

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Behavior analysis of materials subjected to extreme demands remains a topical field for a wide range of engineering applications. The materials in discussion are in increasing numbers composites or layered materials, but homogeneous materials are not neglected either. The paper addresses the topic of a homogeneous metallic material subjected to shock loads. Two different thicknesses of alloy steel of known composition were used. Thicknesses used were of 4 mm and 6 mm respectively. After the loads were applied, the samples were cut in the direction of planes passing through the impact point; the microdurity was measured in the crosssection obtained and the medium microdurity areas were plotted. The obtained results allowed the identification of particularities in material behavior, in relation with the thickness, for the same values of the shock energy load and same shape of the penetrator.

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Dynamic Response and Microstructure Evolution of AA2219-T4 and AA2219-T6 Aluminum Alloys

Cited by 10 publications

References 31 publications

Mechanical Behavior and Microstructure Evolution during Hot Torsion Deformation of Aluminum Alloy AA2219

Mechanical Behavior and Microstructure Evolution during Hot Torsion Deformation of Aluminum Alloy AA2219

High Strain Rate Behavior of Ultrafine Grained AA2519 Processed via Multi Axial Cryogenic Forging

Study of structural changes in metallic materials subjected to shock stress

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