Effect of SPD processing on mechanical behavior and dynamic strain aging of an Al-Mg alloy in various deformation modes and wide strain rate range

Valdes-Tabernero, M.A.; Sancho-Cadenas, R.; Sabirov, I.; Murashkin, M. Yu.; Ovid’ko, I. A.; Gálvez, Francisco

doi:10.1016/j.msea.2017.04.024

Cited by 20 publications

(5 citation statements)

References 44 publications

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“…Additionally, the serrated flow has also been observed in the form of pop-ins during nanoindentation testing, which are characterized by displacement bursts in the load vs. displacement graph. A variety of material systems have exhibited this type of behavior [8,9,98,99], including single and polycrystalline metals [100][101][102][103], Al alloys [8,[104][105][106][107][108][109][110][111][112][113][114][115], Cu alloys [116], V alloys [117,118], steels [8,[119][120][121][122][123][124][125][126][127][128][129][130][131], granular systems [132], bulk metallic glasses (BMGs) [8,97,[132][133][134][135][136][137]…”

Section: The Serrated-flow Phenomenonmentioning

confidence: 99%

A Review of the Serrated-Flow Phenomenon and Its Role in the Deformation Behavior of High-Entropy Alloys

Brechtl

Chen

Lee

et al. 2020

Metals

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High-entropy alloys (HEAs) are a novel class of alloys that have many desirable properties. The serrated flow that occurs in high-entropy alloys during mechanical deformation is an important phenomenon since it can lead to significant changes in the microstructure of the alloy. In this article, we review the recent findings on the serration behavior in a variety of high-entropy alloys. Relationships among the serrated flow behavior, composition, microstructure, and testing condition are explored. Importantly, the mechanical-testing type (compression/tension), testing temperature, applied strain rate, and serration type for certain high-entropy alloys are summarized. The literature reveals that the serrated flow can be affected by experimental conditions such as the strain rate and test temperature. Furthermore, this type of phenomenon has been successfully modeled and analyzed, using several different types of analytical methods, including the mean-field theory formalism and the complexity-analysis technique. Importantly, the results of the analyses show that the serrated flow in HEAs consists of complex dynamical behavior. It is anticipated that this review will provide some useful and clarifying information regarding the serrated-flow mechanisms in this material system. Finally, suggestions for future research directions in this field are proposed, such as the effects of irradiation, additives (such as C and Al), the presence of nanoparticles, and twinning on the serrated flow behavior in HEAs.

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Section: The Serrated-flow Phenomenonmentioning

confidence: 99%

A Review of the Serrated-Flow Phenomenon and Its Role in the Deformation Behavior of High-Entropy Alloys

Brechtl

Chen

Lee

et al. 2020

Metals

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“…Not only complementary types are sometimes defined to distinguish some rarer variants of shape of deformation curves associated with the propagation mode, e.g., step-wise curves of type D differing from type A shape by the absence of stress falls (Rodriguez, 1984). Besides, real behaviors often display combinations of types, especially in practically used alloys with complex compositions and initial microstructures (Robinson, 1994;Lebedkina et al, 2014Lebedkina et al, , 2017Andreau et al, 2014;Mogucheva et al, 2016;Valdes-Tabernero et al, 2017). Such a diversity makes difficult the rationalization of various effects of the PLC instability on mechanical behavior of alloys and their relationships with the onset of necking and its progression until failure of tensile samples.…”

Section: Introductionmentioning

confidence: 99%

Interrelation between the Portevin Le-Chatelier effect and necking in AlMg alloys

Zhemchuzhnikova

Lebyodkin

Yuzbekova

et al. 2018

International Journal of Plasticity

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Plastic flow instability caused by the Portevin Le-Chatelier (PLC) effect and its influence on the necking instability were studied in a binary and a precipitation-strengthened AlMg alloy using the digital image correlation (DIC) technique. Coarse-grained structure and two different fine-grained states distinctly distinguished by dislocation density were produced in both alloys using similar routes of thermomechanical processing. The patterns of stress serrations and strain localization observed at different strain rates include virtually all common types of behavior of the PLC effect. Besides, particular spatiotemporal patterns testifying to a concurrency between the propagation and localization of deformation bands are detected at low strain rates. Despite this diversity, the analysis of deformation curves with smoothened-out serrations bears evidence that the onset of necking always corresponds to the geometric Considère condition. Nevertheless, visualization of the evolution of the local strain-rate field using DIC indicates that the two mechanisms of plastic instability are closely interrelated and modify each other's behavior. The neck formation is associated with a progressive immobilization of the PLC bands, ending by the ultimate strain localization. The coexistence of two kinds of instability during necking gives rise to specific spatiotemporal patterns including oscillatory strain localization.

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“…In Figure 1, generally, as the processing temperature increases, the stress decreases. This phenomenon is generally shown in material processing because the dislocation glide becomes easier at higher temperatures and lower stresses [22][23][24]. The easy dislocation glide enables the energy required for deformation to be lower as the flow softening behavior occurs.…”

Section: Discussionmentioning

confidence: 98%

Hot Compression Behavior of New Al-6Mg and Al-8Mg Alloy with Improved Hot Workability Fabricated by Direct Chill Casting Method

Namseok

Choi

Yang

et al. 2021

Metals

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A hot compression test of new Al-6Mg and Al-8Mg alloys was conducted to understand the dynamic recrystallization (DRX) behavior by Mg contents. To investigate the hot workability of Al-Mg with high Mg contents, the hot deformation behavior of Al-6Mg and Al-8Mg alloys was analyzed by a hot compression test in the temperature range of 300–450 °C, and the strain rate range of 10−3–100/s. Subsequently, high-temperature deformation behavior was investigated through the processing map and microstructure observation. In this study, the results have shown that, as the Mg contents increase, the maximum and yield strength increase while rapid flow softening after the peak strain has been observed due to accelerated dynamic recrystallization (DRX). Finally, the increase of Mg contents affects an increase of heat dissipation efficiency to be an indicator of regular deformation.

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Effect of SPD processing on mechanical behavior and dynamic strain aging of an Al-Mg alloy in various deformation modes and wide strain rate range

Cited by 20 publications

References 44 publications

A Review of the Serrated-Flow Phenomenon and Its Role in the Deformation Behavior of High-Entropy Alloys

A Review of the Serrated-Flow Phenomenon and Its Role in the Deformation Behavior of High-Entropy Alloys

Interrelation between the Portevin Le-Chatelier effect and necking in AlMg alloys

Hot Compression Behavior of New Al-6Mg and Al-8Mg Alloy with Improved Hot Workability Fabricated by Direct Chill Casting Method

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