Fast In Situ X-Ray Microtomography Observations of Solidification and Semisolid Deformation of Al-Cu Alloys

Suéry, M.; Terzi, S.; Mireux, Bastien; Salvo, Luc; Adrien, Jérôme; Maire, Éric

doi:10.1007/s11837-011-0219-7

Cited by 24 publications

(20 citation statements)

References 12 publications

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“…4 The mechanical behavior of alloys in the mushy state has recently been intensively studied using x-ray microtomography. In one study, in situ tensile test experiments were performed by Terzi et al 5,6 on alloys in the mushy state at the x-ray synchrotron of the European Synchrotron Radiation Facility (ESRF). The major drawbacks of such in situ tensile tests are that they are carried out in isothermal conditions, and not during cooling, because x-ray microtomography imaging requires time for image acquisition and the liquid state cannot be investigated owing to the rotations required for imaging.…”

Section: Introductionmentioning

confidence: 99%

Determination of Coherency and Rigidity Temperatures in Al-Cu Alloys Using In Situ Neutron Diffraction During Casting

Drezet

Mireux

Száraz

et al. 2014

JOM

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The rigidity temperature of a solidifying alloy is the temperature at which the solid phase is sufficiently coalesced to transmit tensile stress. It is a major input parameter in numerical modeling of solidification processes as it defines the point at which thermally induced deformations start to generate internal stresses in a casting. This temperature has been determined for an Al-13 wt.% Cu alloy using in situ neutron diffraction during casting in a dog-bone-shaped mold. This setup allows the sample to build up internal stress naturally as its contraction is not possible. The cooling on both sides of the mold induces a hot spot at the middle of the sample that is irradiated by neutrons. Diffraction patterns are recorded every 11 s using a large detector, and the very first change of diffraction angles allows for the determination of the rigidity temperature. We measured rigidity temperatures equal to 557°C and 548°C depending on the cooling rate for grain refined Al-13 wt.% Cu alloys. At a high cooling rate, rigidity is reached during the formation of the eutectic phase. In this case, the solid phase is not sufficiently coalesced to sustain tensile load and thus cannot avoid hot tear formation.

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Section: Introductionmentioning

confidence: 99%

Determination of Coherency and Rigidity Temperatures in Al-Cu Alloys Using In Situ Neutron Diffraction During Casting

Drezet

Mireux

Száraz

et al. 2014

JOM

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“…[3] and [4] to solve for qðtÞ and V(t). While the solvability condition [3] yields the constancy of the product qV 2 , the solute balance at intermediate scale [4] incorporates the time evolution of the solute field surrounding the tip through the time dependent flux intensity factor F ðtÞ. Reformulating Eqs.…”

Section: Solidification Modelingmentioning

confidence: 99%

“…[1] These techniques are particularly relevant to metallic alloys, and have been extensively employed in solidification processing, [2][3][4][5] three-dimensional (3D) rendering of microstructures and their evolution, [2] and in experimental mechanics. [6] X-ray imaging, in particular 3D tomography, has reached a sufficient level of maturity to be capable of providing quantitative measurements.…”

Section: Introductionmentioning

confidence: 99%

From Solidification Processing to Microstructure to Mechanical Properties: A Multi-scale X-ray Study of an Al-Cu Alloy Sample

Tourret

Mertens

Lieberman

et al. 2017

Metall Mater Trans A

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We follow an Al-12 at. pct Cu alloy sample from the liquid state to mechanical failure, using in situ X-ray radiography during directional solidification and tensile testing, as well as three-dimensional computed tomography of the microstructure before and after mechanical testing. The solidification processing stage is simulated with a multi-scale dendritic needle network model, and the micromechanical behavior of the solidified microstructure is simulated using voxelized tomography data and an elasto-viscoplastic fast Fourier transform model. This study demonstrates the feasibility of direct in situ monitoring of a metal alloy microstructure from the liquid processing stage up to its mechanical failure, supported by quantitative simulations of microstructure formation and its mechanical behavior.

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“…The mechanical behavior of alloys in the mushy state has recently been intensively studied using X-ray microtomography [5][6][7][8][9][10][11]. In one study, in situ tensile test experiments were performed by Terzi et al [5,6] on Al-Cu alloys in the mushy state at the European Synchrotron Radiation Facility (ESRF).…”

Section: Introductionmentioning

confidence: 99%

<i>In Situ</i> X-Ray Diffraction during Casting: Study of Hot Tearing in Al-Zn Alloys

Drezet

Mireux

Kurtuldu

2015

AMR

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Abstract. During solidification of metallic alloys, coalescence corresponds to the formation of solid bridges between grains when both solid and liquid phases are percolated. As such, it represents a key transition with respect to the mechanical behaviour of solidifying alloys and to the prediction of solidification cracking. Coalescence starts at the coherency point when the grains begin to touch each other, but are unable to sustain any tensile loads. It ends up at the rigidity temperature when the solid phase is sufficiently coalesced to transmit macroscopic tensile strains and stresses. This temperature, also called mechanical or tensile coherency temperature, is a major input parameter in numerical modelling of solidification processes as it defines the point at which thermally induced deformations start to generate internal stresses in a casting. The rigidity temperature has been determined in Al Zn alloys using in situ X-ray diffraction (XRD) during casting in a dog bone shaped mould. This set-up allows the sample to build up internal stress naturally as its contraction is prevented. The cooling on both extremities of the mould induces a hot spot at the middle of the sample which is irradiated by X-rays. Diffraction patterns were recorded every 0.5 s using a detector covering a 426 x 426 mm 2 area. The change of diffraction angles allowed us to observe agglomeration/decohesion of growing grain clusters and to determine a solid volume fraction at rigidity around 98 % depending on solidification time for grain refined Al 6.2 wt% Zn alloys.

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Fast In Situ X-Ray Microtomography Observations of Solidification and Semisolid Deformation of Al-Cu Alloys

Cited by 24 publications

References 12 publications

Determination of Coherency and Rigidity Temperatures in Al-Cu Alloys Using In Situ Neutron Diffraction During Casting

Determination of Coherency and Rigidity Temperatures in Al-Cu Alloys Using In Situ Neutron Diffraction During Casting

From Solidification Processing to Microstructure to Mechanical Properties: A Multi-scale X-ray Study of an Al-Cu Alloy Sample

<i>In Situ</i> X-Ray Diffraction during Casting: Study of Hot Tearing in Al-Zn Alloys

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