Cooperative enhancements in ductility and strain hardening of a solution-treated Al–Cu–Mn alloy at cryogenic temperatures

Cheng, Wangjun; Liu, Wei; Fan, Xiaobo; Yuan, Shijian

doi:10.1016/j.msea.2020.139707

Cited by 44 publications

(4 citation statements)

References 24 publications

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“…Meanwhile, a higher work hardening rate is obtained and local necking is delayed. Liu Wei et al [20] found that the Al-Cu-Mn alloy exhibits cooperatively enhanced ductility and strain-hardening at cryogenic temperatures. The reason for the enhancement of ductility is the reduction in the accumulation of movable dislocations along the grain boundary and increased storage capacity in the grain.…”

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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“…Due to its limited plasticity at room temperature, aluminum alloy components may fracture, consequently restricting their application [4]. Numerous studies have demonstrated that low temperatures may greatly increase the strain hardening, plasticity, and strength of aluminum alloys [5][6][7][8]. Aluminum and its alloys experience plastic deformation at room temperature and low temperatures primarily due to the slip of dislocations along crystallographic planes.…”

Section: Introductionmentioning

confidence: 99%

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

Tang,

Shi,

Zhang

2024

Materials

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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.

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“…On the contrary, aluminum alloys tend to increase plasticity and toughness at cryogenic temperatures [7,8]. Cryogenic forming can significantly improve the strength and plasticity of aluminum alloy materials simultaneously [9][10][11], which is expected to become a revolutionary processing technology. Kumar et al [12][13][14] studied the difference in tensile properties between cryogenic rolling and room-temperature rolling and found that the 2 of 15 yield strength and tensile strength of cryogenic-rolled alloys were significantly higher than those of room-temperature-rolled alloys.…”

Section: Introductionmentioning

confidence: 99%

Cryogenic Deformation Behavior and Microstructural Characteristics of 2195 Alloy

Zhang

Tan

Wang

et al. 2021

Metals

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Cryogenic deformation can improve the strength and plasticity of Al–Li alloy, although the underlying mechanism is still not yet well understood. The effects of cryogenic temperature on the tensile properties and microstructure of an Al–Cu–Li alloy were investigated by means of tensile property test, roughness measurement, scanning electron microscope (SEM), optical microscope (OM), electron backscatter diffraction (EBSD), and transmission electron microscope (TEM). The results indicated that the strength and elongation of the as-annealed (O-state) and solution-treated (W-state) alloys increased with the decrease in deformation temperature, where the increasing trend of elongation of the W-state alloy was more significant than that of the O-state alloy. In addition, a temperature range was observed at approximately 178 K that caused the strength of the W-state alloy to slightly decrease. The decrease in temperature inhibited the dynamic recovery of the Al–Cu–Li alloy, which increased the dislocation density and the degree of work hardening, thus improving the strength of the alloy. At cryogenic temperatures, the internal grain structure was more involved in the deformation and the overall deformation was more uniform, which caused the alloy to have higher plasticity. This study provides a theoretical basis for the cryogenic forming of Al–Li alloy.

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Cooperative enhancements in ductility and strain hardening of a solution-treated Al–Cu–Mn alloy at cryogenic temperatures

Cited by 44 publications

References 24 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

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

Cryogenic Deformation Behavior and Microstructural Characteristics of 2195 Alloy

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