Enhanced deep drawing formability and deformation mechanism of aluminum alloy at cryogenic temperature

Dong, Fei; Huang, Shiquan; Yi, Youping; He, Hailin; Huang, Ke; Wang, Chenguang; Gao, Shenglei; Jia, Yanzhen; Yu, Wenwen

doi:10.1016/j.jallcom.2023.171992

Cited by 15 publications

(3 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the last few decades, the shape of the component has become increasingly complex [4,5], hard-to-deform materials are widely employed [6,7], and the accuracy demand is greatly improved [8,9]. The design of the component makes the most of the deformation capacity of the sheet, leading to great changes in the plastic deformation [10,11]. Deformation of the sheet is not uniform and easily generates excessive thinning, wrinkles, or bulking [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Effect of the non-uniform pressure on the deformation and instability of the sheet in flexible-die bulge forming

Wang,

Wang

2024

Preprint

View full text Add to dashboard Cite

In recent years, the application of non-uniform pressure in flexible-die forming, such as viscous pressure forming and magnetorheological pressure forming, has been utilized in manufacturing many thin-walled components. However, the non-uniform pressure is mainly applied to change the shape of the sheet. The effects of the non-uniform pressure on thickness reduction and fracture are still intricate. In this study, the mechanism of the non-uniform pressure to decrease thickness reduction and delay fracture instability in the bulge test is revealed. The non-uniform pressure changes the principal stresses, causing distinct deformation behaviors. There are two opposite effects on thickness reduction and fracture instability. If the pressure at the bulged pole decreases, the shape is more prolate, leading toa decreased average thickness and a decreased polar curvature. The thickness reduction tends to be severe, and the diffuse necking is easy to produce. If the pressure at the bulged pole increases, the shape is more oblate, leading to an increased strain gradient. The thickness reduction tends to be severe, and the localized necking is easy to produce. Characteristics of the pressure to decrease thickness reduction and delay instability are presented. Viscous pressure bulge tests are carried out. Experiment results of the shape, thickness uniformity, polar strain, and fracture verify the theory. The fracture strain increases by 5.6 % compared with the uniform pressure condition. This study proves that non-uniform pressure can promote sheet formability, indicating that non-uniform pressure has broad application prospects in sheet metal forming.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of the non-uniform pressure on the deformation and instability of the sheet in flexible-die bulge forming

Wang,

Wang

2024

Preprint

View full text Add to dashboard Cite

show abstract

“…With the rapid development of the aerospace and automobile industries, there has been great growth in the application of complex thin-walled components [1][2][3][4]. The characteristics of ultra-thin thickness, complex shape, hard-to-deform material, and high dimensional accuracy lead to great challenges in the plastic forming of the sheet components [5][6][7][8]. Deformation of the sheet is not uniform and easily generates excessive thinning, wrinkling, or bulking [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Mechanism and experimental verification of non-uniform pressure in viscous pressure forming

Wang,

2024

Preprint

View full text Add to dashboard Cite

The plastic deformation of the complex thin-walled components is not uniform. Applying a non-uniform load can decrease the thickness reduction and improve the thickness uniformity. In recent years, the application of non-uniform pressure to deform the sheet (such as magnetorheological pressure forming and viscous pressure forming) has attracted researchers’ attention. However, the characteristics of the non-uniform pressure have not been researched. Control of the non-uniform pressure in the forming process lacks theoretical support. In this study, the mechanism of the non-uniform pressure in the viscous pressure bulge test is investigated. The pressure-carrying medium, called viscous medium, is semi-solid and flowable. The inhomogeneous flow behavior of the medium produces non-uniform pressure when the maximum is at the bulged pole. The inhomogeneous deformation behavior of the medium produces non-uniform pressure when the minimum is at the bulged pole. The effects of flow and deformation are opposite. The non-uniform pressure function is derived, and the evolution of the pressure is presented. During forming, the viscosity of the medium increases with the pressure, so the effect of the flow behavior increases, and the pressure weight at the pole increases. Viscous pressure bulge tests are carried out to verify the theory. The gradient and evolution of the pressure can be controlled by the loading velocity and the property of the medium. The results provide theoretical guidance for the control of the pressure in viscous pressure forming, and the methodology is expected to analyze the non-uniform pressure in other flexible die forming processes.

show abstract

“…Dislocation slips and the mechanical characteristics of Al alloy are closely linked; for example, strength is determined by the difficulty of dislocation movement, while plasticity requires easy dislocation motion [9,10]. The work hardening of aluminum alloy is mainly affected by the behavior of dislocation-namely, activation of slip systems, dislocation storage, or recovery [11]. At the same time, the mechanical response is also closely related to the slip mode.…”

Section: Introductionmentioning

confidence: 99%

Temperature-Induced Variations in Slip Behavior of Single Crystal Aluminum: Microstructural Analysis

Tang,

Shi,

Zhang

2024

Materials

View full text Add to dashboard Cite

The simultaneous increase in strength and plasticity of aluminum and its alloys at cryogenic temperatures has been shown in previous research, but the deformation mechanism was still unclear. Therefore, the purpose of this investigation was to reveal the relationship between slip behavior and mechanical response at low temperatures. A quasi-in situ scanning electron microscope was used to observe the evolution of slip bands in the selected aluminum single crystals with two typical orientations at 25 °C, −100 °C, and −180 °C. The results showed that irrespective of orientation, the density of the slip plane was increased with the decline in temperature, which inhibited slip localization and significantly improved plasticity and work hardening. In detail, at RT, the slip bands were widening until the micro-cracks were generated, causing early failure during deformation. When the temperature was decreased to −180 °C, the slip plane density was increased, and the deformation was more homogenous. Moreover, the slip mode was influenced by orientation and temperature. In particular, a single slip system was activated in the sample with the [112] orientation at all the temperatures investigated. Multiple slip systems were found to activate at 25 °C and −100 °C, and only the primary slip system was activated in the sample with [114] orientation at −180 °C. These findings deepen the understanding of slip behavior at cryogenic temperatures, providing new insights into the deformation mechanism of aluminum and its alloys.

show abstract

Enhanced deep drawing formability and deformation mechanism of aluminum alloy at cryogenic temperature

Cited by 15 publications

References 34 publications

Effect of the non-uniform pressure on the deformation and instability of the sheet in flexible-die bulge forming

Effect of the non-uniform pressure on the deformation and instability of the sheet in flexible-die bulge forming

Mechanism and experimental verification of non-uniform pressure in viscous pressure forming

Temperature-Induced Variations in Slip Behavior of Single Crystal Aluminum: Microstructural Analysis

Contact Info

Product

Resources

About