An analysis of the surface quality of AA5182 at different testing temperatures

Schneider, Robert J.; Grant, R.J.; Heine, Burkhard; Börret, Rainer; Bürger, Stefan; Zouaoui, Zoubir

doi:10.1016/j.matdes.2014.08.028

Cited by 33 publications

(7 citation statements)

References 12 publications

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“…Schneider et al [18] described an increase in uniform elongation of 75% for the Al-Mg alloy EN AW 5182 when the temperature is lowered to 77 K. In a multiaxial stress state, realized by limiting dome height experiments, a significant improvement was also achieved. Cryogenic temperatures also suppress the PLC effect thus preventing an uneven surface due to band formation and generate higher surface quality [25]. This makes it appropriate for the automotive industry to deploy Al-Mg alloys in outer panels, and renders a unialloy system possible.…”

Section: Introductionmentioning

confidence: 99%

Room Temperature Recovery of Cryogenically Deformed Aluminium Alloys

Gruber

Grabner

Falkinger³

et al. 2020

SSRN Journal

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Increased formability of aluminium alloys has been demonstrated via cryogenic deformation. In previous studies, the microstructures of samples deformed at low temperatures were analysed after reheating to room temperature (RT) and storage. However, after heating the dislocation structure and density of the deformed material do not reflect the cryogenic situation. In this work, we investigate the evolution of flow stress during recovery in Al-Mg and Al-Mg-Si alloys. We examine the RT recovery behaviour of samples pre-strained at 77 K to different strain levels, and evaluate the structural stability upon subsequent deformation. We also study microstructural evolution via in-situ synchrotron X-ray diffraction, starting from initial conditions at cryogenic temperatures to long-term RT-recovery. Recovery of cryogenically deformed samples at RT results in reduction of the flow stress, in dependence on RT storage. The recovery process can be divided into three distinct sections, each based on a different mechanism characterized by either the arranging or the annihilation of dislocations. Subsequent further straining at room temperature after cryogenic forming also generates plastic instabilities and premature fracture due to unfavourable hardening and recovery assisted softening interplay.

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Section: Introductionmentioning

confidence: 99%

Room Temperature Recovery of Cryogenically Deformed Aluminium Alloys

Gruber

Grabner

Falkinger³

et al. 2020

SSRN Journal

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“…The PLC effect results in parallel bands appearing on the surface of the formed sheet, which are considered to be unacceptable surface defects. However, cryogenic forming of AA5182 sheet prevents the formation of the PLC bands [21,22].…”

Section: Resultsmentioning

confidence: 99%

Improved Formability of AA5182 Aluminium Alloy Sheet at Cryogenic Temperatures

Sotirov

Falkinger

Grabner

et al. 2015

Materials Today: Proceedings

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This study describes the forming behaviour of work hardening AA5182 sheet alloy at various low temperatures. The material parameters including flow curves, Lankford parameters and forming limit curves were obtained by experimental testing in the temperature range from room temperature to -196 °C, which were then used for isothermal forming simulations using the finite element method (FEM). It was found that strength, elongation and forming limits increase with decreasing temperature. The finite element model was validated using deformed Nakajima strips. Numerical results presented in this study demonstrate the potential of cryogenic forming for manufacturing of complex automotive components.

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“…In order to reduce or avoid Lüders elongation and DSA it is crucial to identify the influencing factors. While some measures, such as changing the deformation temperature [18,19,20,21,22] or the deformation rate [23,24,25] might influence the extent of DSA (see Figure 1), they are usually not applicable for the serial production of, e.g., outer car parts. Other feasible ways to minimize Lüders elongation and DSA and their optical manifestations are still needed.…”

Section: Introductionmentioning

confidence: 99%

Effect of Compositional and Processing Variations in New 5182-Type AlMgMn Alloys on Mechanical Properties and Deformation Surface Quality

Ebenberger

Uggowitzer

Gerold³

et al. 2019

Materials

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Laboratory-scale sheets of 5182-type AlMgMn alloys with varying Mg and Mn contents and additions of different amounts of Zn, Cu, Zr and Er were studied. The sheets were produced using two different cold-rolling degrees and two soft-annealing treatment procedures: air-circulated furnace annealing at 370 °C with subsequent furnace cooling, and salt-bath annealing with subsequent water quenching. Mechanical properties and deformation surface quality were studied via tensile tests with simultaneous visual surface characterization. The influence of the chemical composition and the processing route on grain size, mechanical properties, and surface quality is discussed in the study. A reduction in the Mg content improves the surface quality after plastic deformation, but at the expense of the mechanical properties. The results suggest the presence of an optimum Mn content in terms of optical appearance and mechanical properties. Adding Zr largely inhibits recrystallization, which is reflected in a textured microstructure. Adding Er affects neither the surface quality nor the mechanical properties. Specific combinations of Zn or Cu addition, cold-rolling degree, and heat treatment generate significant improvements in the mechanical and optical properties. In general, annealing at high temperature with subsequent quenching leads to enhanced surface quality and mechanical properties, and adding Zn enables further noteworthy improvements.

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An analysis of the surface quality of AA5182 at different testing temperatures

Cited by 33 publications

References 12 publications

Room Temperature Recovery of Cryogenically Deformed Aluminium Alloys

Room Temperature Recovery of Cryogenically Deformed Aluminium Alloys

Improved Formability of AA5182 Aluminium Alloy Sheet at Cryogenic Temperatures

Effect of Compositional and Processing Variations in New 5182-Type AlMgMn Alloys on Mechanical Properties and Deformation Surface Quality

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