The Influence of Specimen Thickness on the Lüders Effect of a 5456 Al-Based Alloy: Experimental Observations

Cai, Yong; Yang, Suhui; Fu, Shaojing; Zhang, Qingchuan

doi:10.3390/met6050120

Cited by 26 publications

(10 citation statements)

References 38 publications

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“…As is typical of an SSSS sample, the tensile deformation curve of the FSPed specimen (440-W) exhibits two unusual behaviors ( Figure 3). The first behavioral phenomenon is the appearance of a stress plateau at the yield point, which is often a result of interactions between the gliding dislocations and solute atoms and is caused by grain refinement, as is the case with the Piobert-Lüders effect [29][30][31]. The second phenomenon is the appearance of a serrated flow, where serrated flow instability occurs at a critical point corresponding to a critical strain (ε c ).…”

Section: High Improvement Of Tensile Ductility In the Fsped Sample VImentioning

confidence: 99%

“…For the 440-W specimen, the stress-strain curve showed a plateau at the initial stage just after the end of elastic deformation. In the literature [37], this is called the yield-point phenomenon as well as the Piobert-Lüders effect [29][30][31]. Tensile deformation is followed by a serrated Lüders extension.…”

Section: High Improvement Of Tensile Ductility In the Fsped Sample VImentioning

confidence: 99%

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Examination of the High Tensile Ductility Improvement in an As-Solutionized AA7075 Alloy with the Aid of a Friction Stir Process

Hung

Lui

2019

Metals

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The ductility enhancement of an AA7075 aluminum alloy aided by a friction stir process (FSP) and various heat treatments was investigated and compared in terms of outcome with full annealing (O). The results indicate that a big improvement in the tensile ductility was achieved by freezing the sample at temperatures below 0 °C after the solution treatment and water quenching (W treatment), and further improvement could be acquired via a friction stir process due to grain refinement (<6 μm). Thus, the observed improvement in tensile ductility can be explained by the fact that the W treatment and friction stir processing scheme had an increased strain-hardening effect and decreased the presence of intermetallic particles that are harmful to uniform tensile deformation, consequently causing strain localization in the early stage of tensile deformation, which suggests that these treatment are a potential solution for insufficient formability. In general, the elongation to failure values for the W and FSP-treated specimens (>40%) were at least 1.5-fold greater than that of the annealed alloy. In addition, serrated flow could be observed in the tensile flow curves, and both the Piobert–Lüders effect and the Portevin–LeChatelier (PL) effect could be observed. The enhancement in the tensile ductility was examined in terms of the existence of intermetallic particles and the supersaturated concentration of the solid solution.

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Section: High Improvement Of Tensile Ductility In the Fsped Sample VImentioning

confidence: 99%

Section: High Improvement Of Tensile Ductility In the Fsped Sample VImentioning

confidence: 99%

Examination of the High Tensile Ductility Improvement in an As-Solutionized AA7075 Alloy with the Aid of a Friction Stir Process

Hung

Lui

2019

Metals

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“…The formation time of the Lüders band needs to be further investigated. Several experimental studies have been performed on the Lüders behavior using digital image correlation (DIC) [10][11][12]. In this study, our aim is to try to answer the two questions through in-situ observation using a digital image correlation (DIC) technique that has been proven useful [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

In-Situ Observation of Lüders Band Formation in Hot-Rolled Steel via Digital Image Correlation

Qiu

Inoue

Ueji

2020

Metals

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Although the Lüders yield phenomenon has been investigated for more than 150 years, some understanding of Lüders band formation lack substantial support from experimental evidence. In-situ observation of Lüders band formation in hot-rolled steel experimentally clarified the following facts: (i) When stress reaches the true upper yield stress, the Lüders band begins to nucleate. True upper yield stress is greater than nominal upper yield stress. (ii) Gross stress concentration promotes the Lüders band formation, and the size of the gross stress concentration region determines the initial width of the Lüders band. (iii) The Lüders band nucleates far ahead of the gross yield point.

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“…This phenomenon was observed in the 1950s [8,9], but it could not be fully explained at the time. Today, this phenomenon is being intensively investigated [10][11][12][13][14][15] with the development of modern testing methods. Lüders bands appear after the proportionality limit has been reached, and therefore it is important to study which factors affect the proportionality limit.…”

Section: Introductionmentioning

confidence: 99%

The Application of a Factorial Experiment with Repeated Measurements in the Investigation of Parameters Influencing the Properties of Niobium Microalloyed Cold Drawn Welded Steel Tubes

Rešković

Grizelj

Brlić

et al. 2020

TFAMENA

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It has been observed that inhomogeneous deformations occur at the beginning of the plastic material flow during the cold drawing of welded tubes and after the proportionality limit R p has been reached. Therefore, it is important to determine the most influential factor at the beginning of the plastic material flow. Tests were carried out on a welded joint and on the base material. The study was performed on two steels with different contents of the microalloying element niobium. Tubes were drawn with two different degrees of reduction. The factorial experiment consisting of three factors at two levels 2 3 with repeated measurements showed that the degree of reduction has the greatest influence on the proportionality limit.

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The Influence of Specimen Thickness on the Lüders Effect of a 5456 Al-Based Alloy: Experimental Observations

Cited by 26 publications

References 38 publications

Examination of the High Tensile Ductility Improvement in an As-Solutionized AA7075 Alloy with the Aid of a Friction Stir Process

Examination of the High Tensile Ductility Improvement in an As-Solutionized AA7075 Alloy with the Aid of a Friction Stir Process

In-Situ Observation of Lüders Band Formation in Hot-Rolled Steel via Digital Image Correlation

The Application of a Factorial Experiment with Repeated Measurements in the Investigation of Parameters Influencing the Properties of Niobium Microalloyed Cold Drawn Welded Steel Tubes

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