The transition from discontinuous to continuous recrystallization in some aluminium alloys

Jazaeri, H.; Humphreys, F.J.

doi:10.1016/j.actamat.2004.03.031

Cited by 246 publications

(120 citation statements)

References 24 publications

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“…[19][20][21] The significant effects of initial grain size on the post-DRX recrystallization in different materials has also been reported in a number of studies. [14,22] For example, it has been shown that during annealing of a deformed Al alloy, a transition from DDRX to CDRX can occur with a considerable decrease in the initial grain size. [22] Numerous researchers have studied the DRX and post-DRX behaviors of steels and other alloys, considering the effect of different variables, including temperature, chemical composition, and strain rate.…”

Section: A Dehghan-manshadi and Pd Hodgsonmentioning

confidence: 99%

“…[14,22] For example, it has been shown that during annealing of a deformed Al alloy, a transition from DDRX to CDRX can occur with a considerable decrease in the initial grain size. [22] Numerous researchers have studied the DRX and post-DRX behaviors of steels and other alloys, considering the effect of different variables, including temperature, chemical composition, and strain rate. [1,[23][24][25] However, there are few studies on the influence of initial grain size, particularly for very fine initial grain sizes, on these phenomena.…”

Section: A Dehghan-manshadi and Pd Hodgsonmentioning

confidence: 99%

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Dependency of Recrystallization Mechanism to the Initial Grain Size

Dehghan-Manshadi

Hodgson

2008

Metall Mater Trans A

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The effect of initial grain size on the recrystallization behavior of a type 304 austenitic stainless steel during and following hot deformation was investigated using hot torsion. The refinement of the initial grain size to 8 lm, compared with an initial grain size of 35 lm, had considerable effects on the dynamic recrystallization (DRX) and post-DRX phenomena. For both DRX and post-DRX, microstructural investigations using electron backscattered diffraction confirmed an interesting transition from conventional (discontinuous) to continuous DRX with a decrease in the initial grain size. Also, there were unexpected effects of initial grain size on DRX and post-DRX grain sizes.

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Section: A Dehghan-manshadi and Pd Hodgsonmentioning

confidence: 99%

Section: A Dehghan-manshadi and Pd Hodgsonmentioning

confidence: 99%

Dependency of Recrystallization Mechanism to the Initial Grain Size

Dehghan-Manshadi

Hodgson

2008

Metall Mater Trans A

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“…It is generally considered that the static recrystallization (SRX) mechanism operating in deformation-induced UFG/NC metals during annealing is a continuous static recrystallization (c-SRX) [33,34] which may be classified into the three separate stages of recovery, transient recrystallization and normal grain growth [35]. In the present research, three stages were also present in NC Ti during the thermal treatment.…”

Section: The Recrystallization Mechanismmentioning

confidence: 70%

Temperature and strain rate dependence of microstructural evolution and dynamic mechanical behavior in nanocrystalline Ti

Zhang

Wang

Zhilyaev

et al. 2015

Materials Science and Engineering: A

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The mechanical behavior of commercial purity titanium with a nanocrystalline (NC) grain size was investigated using split Hopkinson pressure bar tests at high strain rates and over a range of temperatures. The study was accompanied by detailed microstructural investigations before and after compression testing. The results show that rotary dynamic recrystallization operates during compressive deformation at strain rates of ~3000 and ~4500 s -1 at temperatures from 298 to 573 K but cells form at 673 K. The dynamic mechanical behavior of NC Ti shows a strong dependence on temperature and strain rate such that the flow stress and the strain hardening rate both increase with increasing strain and decreasing temperature. A constitutive equation is derived to relate the flow stress to the temperature, strain rate and true strain and to predict the yield strength and the peak stress of NC Ti subjected to dynamic deformation at elevated temperatures.

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“…No recognizable "nucleation" of the recrystallized grains occurs, and the microstructure evolves relatively homogeneously throughout the material, which process can reasonably be classified as continuous recrystallizaton [9]. Since this phenomenon normally occurs in materials after large strain deformation [9] and cold spray is a large strain deformation process at elevated temperatures [2], so the continuous recrystallization could caused by high dislocation density under large strain and high dislocation movability at elevated temperature. Figure 7 shows the morphologies of Vickers hardness indents on the as-sprayed coating and annealed coatings.…”

Section: Annealed Coating Characterizationmentioning

confidence: 99%

“…Some publications [6][7][8] show substructure was removed through recovery and recrystallization by grain boundary migration and the ductility was significantly improved by annealing. Although some researchers [9,10] discussed about the recrystalization mechanism of the bulk metals after large strain deformation, the recrystallization mechanism of the metal powder particles under high strain deformation is still not understood well.…”

Section: Introductionmentioning

confidence: 99%

Structural Transformation and Mechanical Properties of Cold Sprayed Nickel Coatings after Annealing

et al. 2008

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Cold spray is a relatively new coating technology in which coatings can be produced by powdered particles under large plastic deformation without significant heating. In this paper, nickel coatings were fabricated by cold spray process followed by heat treatment in inert gas. Structural transformation from as-sprayed to annealed coatings was investigated by Electron Backscattering Diffraction (EBSD) in a FEG-SEM. The results show that after cold spraying sub-micron grains and subgrains with high crystal strain appear in the particle bond interface, but not shown in the center of particles. Microstructure was transformed to be uniform and stresses were released after annealing in 400°C for one hour. And ductility and formability were significantly improved due to recovery and recrystallization. Continuous recrystallization after large strain deformation could occur after cold spraying followed by annealing.

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The transition from discontinuous to continuous recrystallization in some aluminium alloys

Cited by 246 publications

References 24 publications

Dependency of Recrystallization Mechanism to the Initial Grain Size

Dependency of Recrystallization Mechanism to the Initial Grain Size

Temperature and strain rate dependence of microstructural evolution and dynamic mechanical behavior in nanocrystalline Ti

Structural Transformation and Mechanical Properties of Cold Sprayed Nickel Coatings after Annealing

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