Effects of particles and solutes on strength, work-hardening and ductile fracture of aluminium alloys

Westermann, Ida; Pedersen, Ketill Olav; Furu, Trond; Børvik, Tore; Hopperstad, Odd Sture

doi:10.1016/j.mechmat.2014.08.006

Cited by 55 publications

(35 citation statements)

References 37 publications

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“…The average strain rate in the tests was 41 5·10 s  before necking. The applied force and the diameter at the minimum cross section of the specimen were measured continuously until fracture, using an in-house measuring rig with two perpendicular lasers that accurately measured the specimen diameter (see [12] for details …”

Section: Mechanical Testingmentioning

confidence: 99%

“…Using a laser-based measuring system in combination with finite element simulations of the tensile tests, the work-hardening curve of the material could be determined to failure. In a previous study by the authors, this method was used to investigate the work-hardening and ductile fracture of the same alloys in the cast and homogenized condition [12]. The materials investigated were two AlFe alloys, one AlMn alloy and one AlMgSi alloy.…”

Section: Introductionmentioning

confidence: 99%

“…In [12], the volume fractions of particles and solute elements in the four alloys were estimated using the Alstruc code, which is based on standard solidification and diffusion theory and consists of three modules, i.e. solidification, homogenization and an Mg 2 Si module [13]- [15].…”

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confidence: 99%

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Influence of microstructure on work-hardening and ductile fracture of aluminium alloys

et al. 2015

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The effect of microstructure on the work-hardening and ductile fracture of aluminium alloys was studied using an experimental-numerical approach. Four aluminium alloys with different strength and particle content were tested in uniaxial tension after the following subsequent processing steps: 1) casting and homogenization, 2) extrusion, and 3) cold rolling followed by heat treatment. The latter processing step was carried out to obtain a recrystallized grain structure with random crystallographic texture. The alloys were two AlFe alloys with different Fe content, one AlMn alloy and one AlMgSi alloy. The grain structure, particle distribution and crystallographic texture were determined for all combinations of alloy and processing route using optical and scanning electron microscopy. Tensile tests were carried out on axisymmetric samples to obtain the true stressstrain curves to failure and the true failure strain of the materials, using a laser-based measuring system. Based on numerical simulations of the tensile tests, the equivalent stress-strain curves were determined to failure, assuming J 2 flow theory. The results showed that the microstructure had a marked effect on both work-hardening and ductility, while the ductile fracture mechanism remained unchanged. The plastic anisotropy, induced by the extrusion process and not entirely removed by the cold rolling and heat treatment, led to a wide range of fracture modes of the axisymmetric samples. The failure strain was markedly lower for the cast and homogenized material than for the extruded and the cold rolled and recrystallized materials of the same alloy. The failure strain was further found to decrease linearly with the yield stress for similar microstructure.

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Section: Mechanical Testingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of microstructure on work-hardening and ductile fracture of aluminium alloys

et al. 2015

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“…Ling [30] extrapolated the hardening from before necking and validated it with an FEM simulation of the post-necking deformation. Westermann et al [31] used the same laser gauge measurement and a similar numerical simulation method as in this work, but for isotropic aluminium alloys. However, to the authors' best knowledge, the proposed combination of crystal plasticity, anisotropic material model and optimization technique to obtain the equivalent stress-strain curve all the way to failure for a ductile aluminium alloy has not been used before.…”

Section: Introductionmentioning

confidence: 99%

An experimental–numerical method to determine the work-hardening of anisotropic ductile materials at large strains

Khadyko¹,

Dumoulin²,

Hopperstad³

2014

International Journal of Mechanical Sciences

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The determination of work hardening for ductile materials at large strains is difficult to perform in the framework of usual tensile tests because of the geometrical instability and necking in the specimen at relatively low strains. In this study we propose a combination of experimental and numerical techniques to overcome this difficulty. Extruded aluminium alloys are used as a case since they exhibit marked plastic anisotropy. In the experiments, the minimum diameters of the axisymmetric tensile specimen in two normal directions are measured at high frequency by a laser gauge in the necking area together with the corresponding force, and the true stress-strain curve is found. The anisotropy of the material is determined from its crystallographic texture using the crystal plasticity theory. This data is used to represent the specimen by a 3D finite element model with phenomenological anisotropic plasticity. The experimental true stress-strain curve is then used as a target curve in an optimization procedure for calibrating the hardening parameters of the material model.As a result, the equivalent stress-strain curve of the material up to fracture is obtained.

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“…Srivatsan et al [5] found that macroscopic fracture of AA7150 was by a shear mechanism, whereas microscopic fracture revealed both brittle and ductile failure mechanisms. Westermann et al [6] investigated the influence of particles and solutes on the ductile fracture of four different aluminum alloys in as-cast and homogenized conditions. Hopperstad et al [7], Narasayya et al [8], Chen [9] and Xing et al [10] studied the fracture behavior of some aerospace aluminum alloys, such as 7075, 2219 and 7085.…”

Section: Introductionmentioning

confidence: 99%

Fracture performance of high strength steels, aluminium and magnesium alloys during plastic deformation

Wang

2015

MATEC Web of Conferences

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Abstract.A series of uniaxial tension tests were performed for 5052 and 6061 aluminum alloys, AZ31B magnesium alloy, TRIP600 and DP600 steels, to obtain a better understanding of their fracture performance. Scanning electron microscope (SEM) observation of the microstructure evolution was conducted. The dimple structure, orientation relationship between the fracture surface and tensile direction, necking behavior were analyzed. The fracture mechanism and fracture mode of each material was discussed in detail. The results show that TRIP600 steel is subject to a typical inter-granular ductile fracture combined by shear fracture. DP600 steel belongs to mainly ductility mixed with normal fracture. Both 5052 and 6061 aluminum alloys are subject to a mixed ductility fracture and brittle fracture. AA5052 and AA6061 belong to a typical shear fracture and a normal fracture, respectively. Magnesium AZ31B is typical of a brittle fracture combined with normal fracture.

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Effects of particles and solutes on strength, work-hardening and ductile fracture of aluminium alloys

Cited by 55 publications

References 37 publications

Influence of microstructure on work-hardening and ductile fracture of aluminium alloys

Influence of microstructure on work-hardening and ductile fracture of aluminium alloys

An experimental–numerical method to determine the work-hardening of anisotropic ductile materials at large strains

Fracture performance of high strength steels, aluminium and magnesium alloys during plastic deformation

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