Effect of large deformations on the microstructure of aluminium alloys

Richert, M.; Richert, J.; Zasadziński, J.; Hawryłkiewicz, Sonia; Długopolski, J.

doi:10.1016/s0254-0584(03)00066-x

Cited by 33 publications

(26 citation statements)

References 8 publications

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“…As a result, at the highest applied deformation, the microhardness of aluminium reached the level of about 50 MPa, while that of AlCu4Zr alloy was about 100 MPa. This result is comparable with hardening of the AlCu4Zr alloy, attained in the CEC (cyclic extrusion compression) process, after the true deformation of about 14 [9].…”

Section: Investigation Resultssupporting

confidence: 81%

“…At the highest deformation it attains nanometric dimensions and is comparable with the width of microbands obtained in AlCu4Zr alloy deformed by the CEC method, to considerably higher deformations, but with much smaller deformation rates [8,9].…”

Section: Discussionsupporting

confidence: 70%

“…In the area of the bands, the level of the produced heat exceeds the degree of its dissipation to the surrounding material. The maximum temperature, attained locally as a result of this phenomenon, could be of the order of some hundreds degrees, above the temperature of the surrounding material [8]. This paper is concentrated on the investigations of the development of the banded structure, formed in the dynamically compressed aluminium and AlCu4Zr alloy.…”

Section: Introductionmentioning

confidence: 99%

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Structure and properties of dynamically compressed Al99.5 and AlCuZr alloy

Richert¹,

Leszczyńska²

2004

Journal of Alloys and Compounds

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Section: Investigation Resultssupporting

confidence: 81%

Section: Discussionsupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

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Structure and properties of dynamically compressed Al99.5 and AlCuZr alloy

Richert¹,

Leszczyńska²

2004

Journal of Alloys and Compounds

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“…In deformed material, many shear bands appear on a macroscopic scale as a result of mutual intersections that create faults [19]. Structural transformations are the result of accumulated resilient stresses in the material and uneven distribution of energy in its volume.…”

Section: Introductionmentioning

confidence: 99%

Multi-axial forging of Fe3Al-base intermetallic alloy and its mechanical properties

2016

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Tri-axial plane-strain forging was applied to the Fe-28Al-5Cr-0.8Zr-0.04B intermetallic alloy, in order to study its grain refinement and possible improvement in mechanical properties. The forging temperature range was from 20 to 600°C. The maximum number of forging passes was 67. The deformed microstructure was investigated using electron backscatter diffraction in a scanning electron microscope. At forging temperatures \500°C, the alloy was very prone to brittle cracking. At the temperature range of 500-600°C, the overall plasticity of material increased and the cracking tendency was reduced but not completely eliminated. Extensive processes of dynamic recovery/recrystallization were observed during forging at 600°C after 10-40 passes. Recrystallized areas with an average grain size of a few micrometers were observed. However, even after severe deformation at 600°C, resulting from 40 forging passes (e * 11.3), dynamic recrystallization was incomplete and the fraction of low-angle boundaries was still high. The Vickers microhardness substantially increased from 280 HV0.1 to 450 HV0.1 at the center of the sample after both deformations at room temperature as well as after 20-40 cycles at 500-600°C. However, a further increase of strain for a sample deformed at 600°C after 67 passes (e * 28) led to quite a significant hardness decrease at the center of the sample. This phenomenon could be associated with the initiation of dynamic recrystallization. None of the samples forged at the 500-600°C range exhibited any ductility improvement during subsequent tensile testing at room temperature, most likely, owing to the absence of a uniform ultrafine-grained structure developed during forging.

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“…In the previous studies, experiments were carried out for extrusion ratios reaching up to 40; their results showed that after the extrusion procedure, a 70-80% deformation occurred [26][27][28]. The structure of aluminium subjected to low ratios of extrusion is similar to that of the cast aluminium (coarse-grained).…”

Section: Introductionmentioning

confidence: 96%