Room temperature recovery of cryogenically deformed aluminium alloys

Gruber, Belinda; Grabner, Florian; Falkinger, Georg; Schökel, Alexander; Spieckermann, Florian; Uggowitzer, Peter J.; Pogatscher, Stefan

doi:10.1016/j.matdes.2020.108819

Cited by 28 publications

(5 citation statements)

References 64 publications

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“…Many factors affect the DRX mechanism, including the stacking fault energy (SFE), the TMP conditions, the distribution of the grain size, the chemical composition of the second phase, and the distribution and size of the second phase [ 26 ]. It is well known that Al is a face centered cubic (FCC) close packed structure with a high SFE [ 27 , 28 ]. When subjected to large plastic deformation processes, such as extrusion or rolling, metals with a high SFE tend to facilitate cross-slips to form substructures like cells or subgrains during the formation of dislocation cell subdivisions, rather than undergoing twinning and twin fragmentation [ 26 , 29 ].…”

Section: Discussionmentioning

confidence: 99%

Recrystallization of Hot-Rolled 2A14 Alloy during Semisolid Temperature Annealing Process

et al. 2023

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In this study, in order to provide proper parameters for the preparation of semisolid billets, the semisolid annealing of hot-rolled 2A14 Al alloy was investigated. The microstructure was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) with an X-ray energy dispersive spectrometer (EDS) and electron backscattered diffraction (EBSD), and scanning transmission electron microscopy (STEM). The XRD results showed that, with an increase in temperature, the θ-Al2Cu equilibrium gradually dissolved in the matrix. The EDS results of SEM and STEM showed a coarse θ-Al2Cu phase, ultrafine precipitate Al(MnFeSi) or (Mn, Fe)Al6 phase, and atomic clusters in the microstructure. The EBSD results showed that the recrystallization mechanism was dominated by continuous static recrystallization (CSRX), homogeneous nucleation occurred when the sample was heated to near solidus temperature, and CSRX occurred at a semisolid temperature. In the process of recrystallization, the microtexture changed from the preferred orientation to a random orientation. Various experimental results showed that static recrystallization (SRX) occurred at a semisolid temperature due to the blocking effect of atomic clusters on the dislocation slip, and the Zener drag effect of fine precipitates on low-angle grain boundaries (LAGBs) disappeared with melting at a semisolid temperature.

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Section: Discussionmentioning

confidence: 99%

Recrystallization of Hot-Rolled 2A14 Alloy during Semisolid Temperature Annealing Process

et al. 2023

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“…[25]. It is well known that Al is a face centered cubic (FCC) close packed structure with high SFE [26,27]. When subjected to large plastic deformation such as extrusion or rolling, metals with high SFE tend to facilitate cross-slip to form substructures like cells or sub-grains in the formation of dislocation cell subdivision rather than twinning and twin fragmentation [25,28].…”

Section: The Deformed Statementioning

confidence: 99%

Recrystallization of Hot-Rolled 2A14 Alloy During Semi-Solid Temperature Annealing Process

Liu¹,

Jiang²,

Zhang³

et al. 2023

Preprint

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In this paper, in order to provide proper parameters for the preparation of semi-solid billets, the semi-solid annealing of hot-rolled 2A14 Al alloy was investigated. The microstructure was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) with X-ray energy dispersive spectrometer (EDS) and electron backscattered diffraction (EBSD), scanning transmission electron microscope (STEM). XRD results show that with the increase of temperature, equilibrium θ-Al2Cu gradually dissolved in the matrix. The EDS results of SEM and STEM show that there were coarse θ-Al2Cu phase, ultra-fine precipitate Al(MnFeSi) or (Mn, Fe)Al6 phase and atomic clusters in the microstructure. EBSD results show that the recrystallization mechanism was dominated by continuous static recrystallization (CSRX), the homogeneous nucleation occurred when the sample was heated to near solidus temperature, and CSRX happened in the semi-solid temperature. In the process of recrystallization, the micro-texture changed from preferred orientation to random orientation. A variety of experimental results show that static recrystallization (SRX) occurred at semi-solid temperature due to the blocking effect of atomic clusters on dislocation slip and the Zener drag effect of fine precipitates on low angle grain boundaries (LAGBs) disappeared with melting at semi-solid temperature.

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“…Readers are invited to refer to the following studies for in-depth insights into the other cold forming processes itemized above. [58][59][60][61][62][63][64][65][66][67] Several experimental and theoretical studies have been carried out to assess the potential of WT forming for the production of industrial parts from precipitation-hardenable aluminum alloys. In another study, [57] for example, WT forming was compared to cold forming in the T6 condition in the precipitation-hardenable aluminum alloy AA7075 by forming an automotive B-pillar using an industrial tool.…”

Section: Cold Forming Of Aluminummentioning

confidence: 99%

“…Readers are invited to refer to the following studies for in‐depth insights into the other cold forming processes itemized above. [ 58–67 ]…”

Section: Forming Strategies To Overcome the Forming Limit Of Aluminum...mentioning

confidence: 99%

Hot Sheet Metal Forming Strategies for High‐Strength Aluminum Alloys: A Review—Fundamentals and Applications

et al. 2023

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In the past decade, aluminum alloys have become important structural materials in the automotive industry, thanks to their low density, high strength, high fracture toughness, and good fatigue performance. However, an important limitation of aluminum alloys is their poor formability at room temperature; as a result, numerous studies have been conducted with the aim of developing forming techniques to overcome this and facilitate the forming of more complex‐shaped components. Following an overview on the metallurgical background of aluminum alloys, this article reviews recent developments in forming processes for aluminum alloys. The focus is on process variants at room temperature and at higher temperatures and on a new hot forming technique promising considerable improvements in formability. This review summarizes the influence of different process parameters on microstructures and mechanical properties. Particular emphasis is given to process design and to the underlying microstructural phenomena governing the strengthening mechanisms.

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Room temperature recovery of cryogenically deformed aluminium alloys

Cited by 28 publications

References 64 publications

Recrystallization of Hot-Rolled 2A14 Alloy during Semisolid Temperature Annealing Process

Recrystallization of Hot-Rolled 2A14 Alloy during Semisolid Temperature Annealing Process

Recrystallization of Hot-Rolled 2A14 Alloy During Semi-Solid Temperature Annealing Process

Hot Sheet Metal Forming Strategies for High‐Strength Aluminum Alloys: A Review—Fundamentals and Applications

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