Mechanical properties and surface characteristics of an AA6060 alloy strained in tension at cryogenic and room temperature

Xu, Zebing; Roven, Hans Jørgen; Jia, Zhihong

doi:10.1016/j.msea.2015.09.083

Cited by 62 publications

(13 citation statements)

References 42 publications

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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%

“…This is certainly due to the fact that sample preparation under low temperatures is hardly possible and cold insertion and measurement of the samples in the electron microscope is only feasible with special setups. Electron microscopy studies were conducted [16,17] via deformation at low temperature; heating to RT for sample preparation; and storage and evaluation of the microstructure at RT. Such measurements do not provide a full picture of the deformation state at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

confidence: 99%

Room Temperature Recovery of Cryogenically Deformed Aluminium Alloys

Gruber

Grabner

Falkinger³

et al. 2020

SSRN Journal

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show abstract

“…The results showed that the two alloys presented a shear fracture under RT but a cup‐and‐cone‐shaped fracture at cryogenic temperature, as shown in Figure . Xu et al [ 51 ] observed the tensile fracture surfaces of AA6060 alloy at 77 and 295 K, as shown in Figure . At 77 K, the alloy displays a smaller reduction of area at fracture, a more irregular surface, a more complex topography as well as more “substructure dimples” with a much smaller average diameter.…”

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

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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“…Shi et al [15] attributed this result to the inhibition of dynamic recovery during deformation in a cryogenic environment, which was beneficial for obtaining a higher dislocation density. Xu et al [16,17] studied the tensile properties and surface characteristics of 6000 series aluminum alloy at room and cryogenic temperatures and found that deformation at 77 K significantly improved the strength and elongation of the alloy. This was due to a higher strain hardening exponent and more uniform deformation mode at cryogenic temperatures.…”

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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Mechanical properties and surface characteristics of an AA6060 alloy strained in tension at cryogenic and room temperature

Cited by 62 publications

References 42 publications

Room Temperature Recovery of Cryogenically Deformed Aluminium Alloys

Room Temperature Recovery of Cryogenically Deformed Aluminium Alloys

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

Cryogenic Deformation Behavior and Microstructural Characteristics of 2195 Alloy

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