The effect of size on the plastic deformation of annealed cast aluminium microwires

Verheyden, S.; Veiga, L. Pires Da; Deillon, Léa; Mortensen, Alicja

doi:10.1016/j.scriptamat.2018.10.009

Cited by 13 publications

(4 citation statements)

References 16 publications

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“…Such condition could be achieved if either the dislocation density is already very low after synthesis or could be effectively reduced due to heat treatments. This is indeed found experimentally for defect scarce, as-cast microwires, 13) testing of small sample volumes where the probability to probe existing dislocation sources is low (e.g., prepared by ion-ablation 14) ), but also for polycrystals consisting of very fine grains and thus large fractions of extremely effective dislocation sinks. Although dislocation storage is already less likely in submicron or nanoscale grains, annealing may further reduce this probability and the lack of existing mobile dislocation segments results in an enhancement of the yield strength, i.e., a hardening by recovery.…”

Section: Introductionsupporting

confidence: 56%

“…Although during cold working of metals only a small portion (<10%) of the spent energy is stored within the microstructure, the material has a tendency to recover upon subsequent annealing, i.e., to return to the defect-scarce state. 13) Accordingly, properties and microstructures are subject to change and thus recovery and related annealing processes such as subgrain growth or recrystallization have been studied extensively for almost a century. 36) Understanding and predicting these processes is crucial to design microstructures with desired properties or crystallographic textures.…”

Section: Introductionmentioning

confidence: 99%

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Anneal Hardening in Single Phase Nanostructured Metals

Renk

Pippan

2023

Mater. Trans.

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Recovery of cold worked metals is associated with a loss of strength due to the reduction of the defect density. However, already in the 1960s analytical models and few experiments suggested that this may not generally be the case and even a hardening rather than a softening might occur. With the availability of severe plastic deformation and deposition techniques this anneal hardening phenomenon has been observed frequently. In this overview we summarize early findings on this topic before focusing on general observations and potential origins, with a special focus to show the similarities for nanostructures across different grain size scales (i.e., structures prepared by deposition and severe plastic deformation techniques, respectively). Comparison of different results indicate a grain size dependent hardening increment that could be additionally affected by segregation or the processing variables. Considering the agreement of the peak hardening temperatures with that for dislocation annihilation at grain boundaries, anneal hardening can be rationalized by the loss of intragranular defects and grain boundary relaxation. Grain boundary diffusivity hence plays a crucial role and particular solutes could amplify the hardening process even further. As anneal hardening already occurs for grain sizes at the micron scale, its effect on properties is even of technological relevance. Beneficial effects on the fatigue strength are evident, but the strain softening of anneal hardened specimens drastically shorten ductility. Nevertheless, some strategies to overcome this adverse effect seem promising to create metallic structures with exceptional combinations of strength and ductility.

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Section: Introductionsupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Anneal Hardening in Single Phase Nanostructured Metals

Renk

Pippan

2023

Mater. Trans.

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“…Because of the constraints imposed by TEM and the more recent synchrotron X-ray Laue microdiffraction facilities (Verheyden et al, 2019), it is very difficult to accurately measure evolution of dislocation density (ρ) during hot deformation and to obviate the problem, Lin and Liu (2003) proposed a dislocation evolution model, by using a normalised dislocation density ̅ :…”

Section: Dislocation Density Evolution Modelmentioning

confidence: 99%

A CDRX-based material model for hot deformation of aluminium alloys

Jiang

et al. 2020

International Journal of Plasticity

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During hot deformation, continuous dynamic recrystallisation (CDRX) is believed to occur, and even dominates microstructural evolution in many metallic materials with high stacking fault energy, such as aluminium alloys. A unique material model for hot deformation of aluminium alloys is proposed in this paper, based on consideration of two processes: (i) increase of dislocation density, induced by plastic deformation, leading to generation, rotation and migration of low angle grain boundaries (LABs) and their transformation into high angle grain boundaries (HABs); (ii) migration of HABs leading to annihilation of both LABs and HABs. At large strain, the above counteracting processes, guided by different mechanisms, lead to saturation of HABs fraction. The model is applied to hot deformation of AA5052 and AA7050 alloys under various temperatures and strain rates, and calculated flow stress, HABs fraction and grain size evolution for both alloys agree well with the corresponding experimental data. The capability of predicting saturation of HABs fraction and average subgrain misorientation angle of both alloys under large strains demonstrate the potential applicability of the model to a wide range of hot forming process conditions.

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“…We report stress relaxation data appertaining to as-cast (27) and annealed (2) aluminium microwires produced through a microcasting process. For an interpretation and discussion of the data on annealed microwires the reader is referred to “ The effect of size on the plastic deformation of annealed cast aluminium microwires” (Verheyden et al, In Press) [1] . For full descriptions of the production process of aluminium microwires or of the tensile testing equipment and procedure the reader is referred to Krebs et al (2017) [2] .…”

mentioning

confidence: 99%

Stress relaxation in the presence of sudden strain bursts: Methodology and stress relaxation data of microcast aluminium microwires

2018

Self Cite

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This data article presents a methodology and the corresponding code developed to perform and process stress relaxation tests where samples display superimposed (i) classical, continuous logarithmic relaxation together with (ii) sudden displacements manifest as abrupt stress decreases. The method extracts the activation area characteristic of the thermally activated mechanism that drives continuous plastic deformation in the material. We report stress relaxation data appertaining to as-cast (27) and annealed (2) aluminium microwires produced through a microcasting process. For an interpretation and discussion of the data on annealed microwires the reader is referred to “ The effect of size on the plastic deformation of annealed cast aluminium microwires” (Verheyden et al., In Press) [1]. For full descriptions of the production process of aluminium microwires or of the tensile testing equipment and procedure the reader is referred to Krebs et al. (2017) [2].

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The effect of size on the plastic deformation of annealed cast aluminium microwires

Cited by 13 publications

References 16 publications

Anneal Hardening in Single Phase Nanostructured Metals

Anneal Hardening in Single Phase Nanostructured Metals

A CDRX-based material model for hot deformation of aluminium alloys

Stress relaxation in the presence of sudden strain bursts: Methodology and stress relaxation data of microcast aluminium microwires

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