Deformation behavior of Al–Cu–Mn alloy sheets under biaxial stress at cryogenic temperatures

Cheng, Wangjun; Liu, Wei; Yuan, Shijian

doi:10.1016/j.msea.2019.05.047

Cited by 58 publications

(10 citation statements)

References 48 publications

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“…The variation law of the yield strength ratio of the three types of plates was opposite to the n value, and the rank was ASP sample > DSP sample > TDSP sample; the yield strength ratio at −196 °C was lower than that at 25 °C, as shown in Figure 5b. The increase in the n value and the decrease in yield strength ratio can increase the formability of the plate [23]. 4.…”

Section: Mechanical Propertiesmentioning

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: Mechanical Propertiesmentioning

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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“…Recent studies show the advantages of deformation at sub-zero temperatures [16][17][18][19][20][21][22][23][24]. 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.…”

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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“…Elongation to fracture of typical Al alloys at room and below zero temperatures (data from refs. [17,39,41,43–50]).…”

Section: High Ductility and Good Formability Of Al Alloys At Cryogenic Temperaturementioning

confidence: 99%

“…Therefore, novel forming techniques at cryogenic temperature have been developed to suit the needs. Cheng et al [ 50 ] developed a bulging test for complicated components under a biaxial stress state at cryogenic temperature, by which the formability of Al–Cu–Mn alloy sheets was improved. Youssef et al [ 87 ] used a cryo‐milling technique to prepare Al–5%Mg powders for in situ consolidation mechanical alloying of a bulk nanocrystalline Al–5%Mg alloy.…”

Section: Cryo‐forming Techniquesmentioning

confidence: 99%

Development of High Performance of Al Alloys via Cryo‐Forming: A Review

Xiong

Su²,

Kong

et al. 2021

Adv Eng Mater

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Weight reduction is a major trend in the development of automotive, marine, and aerospace industry. Al alloys are the ideal choice for the lightweight design because of their superior mechanical properties and small mass density. In recent years, research results have demonstrated that plastic processing at cryogenic temperature can improve the mechanical properties of Al alloys. Herein, the mechanical properties of Al alloys at cryogenic environment as well as at room temperature are compared, and then the main progress is introduced in the development of fabrication of high‐performance Al alloys using cryo‐forming methods, such as cryorolling, asymmetric cryorolling, cryo‐extrusion, and cryo‐forging, with subsequent heat treatment. The grain refinement mechanism and the strengthening mechanism of Al alloys during various cryo‐forming processes are discussed. Finally, the potential development prospects of future researches in this field are proposed.

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Deformation behavior of Al–Cu–Mn alloy sheets under biaxial stress at cryogenic temperatures

Cited by 58 publications

References 48 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

Room Temperature Recovery of Cryogenically Deformed Aluminium Alloys

Development of High Performance of Al Alloys via Cryo‐Forming: A Review

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