A novel deep drawing process for aluminum alloy sheets at cryogenic temperatures

Yuan, Shijian; Cheng, Wangjun; Liu, Wei; Xu, Yang

doi:10.1016/j.jmatprotec.2020.116743

Cited by 70 publications

(14 citation statements)

References 30 publications

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“…The increased strength is attributed to the decrease in the relative slip distance of the activated dislocations, and the suppression of tangles and cells of dislocation collapse during the cryogenic deformation. Yuan Shijian et al [21] studied the deep drawability of Al-Cu-Mn alloy at room and cryogenic temperatures; they found that with the local thinning being weaker after cup drawing at cryogenic temperature, uniform thickness distribution, and a large drawing height and drawing load, the deep drawability was significantly improved. After combining the observation of the microstructure, the reason for the enhancement of deep drawability was clarified.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pretreatment and Cryogenic Temperatures on Mechanical Properties and Microstructure of Al-Cu-Li Alloy

Wang

Zhang

et al. 2021

Materials

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The mechanical properties of Al-Cu-Li alloys after different pretreatments were investigated through tensile testing at 25 and −196 °C, and the corresponding microstructure characteristics were obtained through optical metallography, scanning electron microscopy, electron backscatter diffraction, and transmission electron microscopy. An increasing mechanism of both strength and ductility at cryogenic temperatures was revealed. The results show that the hot deformation pretreatment before homogenization promoted the precipitation of Al3Zr particles, improved particle distribution, and inhibited local precipitation-free zones (PFZ). Both hot deformation pretreatment before homogenization and cryogenic temperature were able to improve strength and ductility. The former improved strength by promoting the precipitation of Al3Zr particles while enhancing the strengthening effect of the second-phase particles and reducing the thickness of the coarse-grained layer. Meanwhile, the increase in ductility is attributable to the decrease in thickness of the coarse-grained layer, which reduced the deformation incompatibility between the coarse and fine grains and increased the strain-hardening index. The latter improved the strength by suppressing dynamic recovery during the deformation process, increasing the dislocation density, and enhancing the work hardening effect. Additionally, the increase in ductility is attributable to the suppression of planar slip and strengthening of grain boundaries, which promoted the deformation in grain interiors and made the deformation more uniform.

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Section: Introductionmentioning

confidence: 99%

Effect of Pretreatment and Cryogenic Temperatures on Mechanical Properties and Microstructure of Al-Cu-Li Alloy

Wang

Zhang

et al. 2021

Materials

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“…In order to explore the limits of the deep drawing process and to achieve a higher drawing ratio, deep drawing at cryogenic temperatures is a well-known process and is being investigated by the GRABNER et al [1], among others like [2]. Drawing ratios β > 2 have been achieved for certain alloys [3]. Inspired by the results and the proven extension of the usable process window by macro-structured tools, a combination of the approaches is investigated in order to achieve a further improvement of the deep drawing process of aluminum materials under cryogenic temperatures via the extension of the process window and an improved distribution of the stresses in the component.…”

Section: Introductionmentioning

confidence: 99%

Influence of Macro-Structured Tools on the Formability of Aluminum Alloys in the Cryogenic Temperature Range

Tulke

Wolf

Lafarge

et al. 2022

KEM

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Aluminum materials are popular materials for research in terms of lightweight construction. How cryogenic forming can be used to increase material utilization in terms of resource efficiency is one of the areas being investigated. Subject of this study are numerical and experimental investigations regarding the formability of the aluminum alloy AA6014-T4 with macro-structured deep drawing tools at cryogenic temperatures. The macro-structure of the deep drawing dies significantly reduces the heat flux between the dies and the blank due to the reduced contact area. For this reason, active cooling or heating of the dies is not required. The process of heat conduction between the tool and the blank, as well as the deep drawing process, is calculated using the FE-method and compared with the experimental investigations. In addition, the induced residual stresses are determined using the hole-drilling method and compared with the computational solution. The presented examination shows an improved deep drawing ratio of the aluminum alloy AA6014-T4 at cryogenic blank temperature without active tool cooling. Additionally, the influence of the blank temperature on the forming regarding the residual stresses in the cups is analyzed and discussed.

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“…The samples exhibited a lower pop-in force and hardness after DCT because the densifiction of shear bands was promoted [23]. Yuan et al [24] studied the drawability of aluminum alloy sheets treated by DCT at different temperatures. The deep drawability was improved as the temperature decreased.…”

Section: Introductionmentioning

confidence: 99%

Effects of Deep Cryogenic Treatment on the Microstructure and Properties of Rolled Cu Foil

et al. 2021

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The development of fifth-generation (5G) communication and wearable electronics generates higher requirements for the mechanical properties of copper foil. Higher mechanical properties and lower resistance are required for flexible copper-clad laminate and high-frequency and high-speed Cu foil. Deep cryogenic treatment (DCT), as a post-treatment method, has many advantages, such as low cost and ease of operation. However, less attention has been paid to the impact of DCT on rolled Cu foil. In this study, the effects of DCT on the microstructure and mechanical properties of rolled Cu foil were investigated. The results show that as the treatment time increased, the tensile strength and hardness first increased and then decreased, reaching a peak value of 394.06 MPa and 1.47 GPa at 12 h. The mechanical property improvement of rolled Cu foil was due to the grain refinement and the increase of dislocation density. The dislocation density of rolled Cu foil after a DCT time of 12 h was determined to have a peak value of 4.3798 × 1015 m−2. The dislocation density increased by 19% and the grain size decreased by 12% after 12 h DCT.

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A novel deep drawing process for aluminum alloy sheets at cryogenic temperatures

Cited by 70 publications

References 30 publications

Effect of Pretreatment and Cryogenic Temperatures on Mechanical Properties and Microstructure of Al-Cu-Li Alloy

Effect of Pretreatment and Cryogenic Temperatures on Mechanical Properties and Microstructure of Al-Cu-Li Alloy

Influence of Macro-Structured Tools on the Formability of Aluminum Alloys in the Cryogenic Temperature Range

Effects of Deep Cryogenic Treatment on the Microstructure and Properties of Rolled Cu Foil

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