An overview of tailoring strain delocalization for strength-ductility synergy

Wu, Hao; Fan, Guohua

doi:10.1016/j.pmatsci.2020.100675

Cited by 318 publications

(78 citation statements)

References 439 publications

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“…If this is the primary reason for the increased SCC resistance in the T7 tempers is somewhat uncertain. However, our results are in agreement with other studies that have previously suggested that these precipitates alter the deformation mode (slip characteristics) and influence the strain localisation at the grain boundaries [23,39]. Higher strain localisation is likely to influence the crack propagation, but also the hydrogen diffusion and trapping behaviour.…”

Section: Discussionsupporting

confidence: 93%

Stress Corrosion Cracking in an Extruded Cu-Free Al-Zn-Mg Alloy

Lervik

Walmsley

Lodgaard

et al. 2020

Metals

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Stress corrosion cracking (SCC) in Cu-free Al-Zn-Mg (7xxx) aluminium alloys limits its use in many applications. In this work, we study in detail the microstructure of a peak and slightly overaged condition in an AA7003 alloy using transmission- and scanning electron microscopy in order to provide a comprehensive understanding of the microstructural features related to SCC. The SCC properties have been assessed using the double cantilever beam method and slow strain rate tensile tests. Grain boundary particles, precipitate free zones, and matrix precipitates have been studied. A difference in the SCC properties is established between the two ageing conditions. The dominating difference is the size and orientation of the hardening phases. Possible explanations correlating the microstructure and SCC properties are discussed.

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Section: Discussionsupporting

confidence: 93%

Stress Corrosion Cracking in an Extruded Cu-Free Al-Zn-Mg Alloy

Lervik

Walmsley

Lodgaard

et al. 2020

Metals

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“…Wherein the tensile stress increased to anapprox. 551mpa as compared to 244mpa of wrought annealed 316LSS [9].The selective laser melting process has a distinctive characteristic of immediate cooling and heating while the mechanism happens. This results in an extremely fine granular structure of the particle as visible on studying a sample of Al-12Si where the microstructure consists of very fine 0.5-1 mm cellular aluminum surrounded by a network of nano-sized Si particles.…”

Section: Role Of 3d Printing In Increasing Ductility and Strengthmentioning

confidence: 98%

“…The grain boundaries are incoherent thus it is difficult for one grain to force through another grain and move forward. This increase in strength comes at the cost of reduced ductility [9]. In SLM the structure of grains is epitaxial and columnar [10].…”

Section: Impact Of Grain Size On Ductility and Strengthmentioning

confidence: 99%

A comprehensive study to select suitable method to enhance mechanical properties during 3D printing of metallic materials

Chandra¹,

Porwal²

2020

E3S Web Conf.

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Metallic metals are governed by their mechanical properties. Ductility and Strength two most significant properties behave as two opposite poles while metal is manufactured by conventional methods. Additive manufacturing however acts as a bridge binding two into more of a proportional relationship. Additive manufacturing commonly referred as 3D Printing reduces the tact time along with high dimensional accuracies hence it has turned out to be the most researched technologies in the recent times. Out of several 3D Printing methods Selective laser melting and Electron beam melting prove more efficient in increasing the strength along with ductility by significantly altering the grain structure thus creating an array of properties which are different from their contemporaries. The paper deals with the effects of the two processes along with the challenges faced due to the defects risen during the processing in order to optimally decide the process to be taken up for a selected metallic metal

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“…[36] Irrespective of the microstructural evolution pathway taken, the ability to refine the grains towards the nanoscale via SPD methods has been amply demonstrated, along with the expected concurrent improvements in strength. [22,54] Materials processed by SPD methods have also been found to have exceptional combinations of strength and ductility, [55][56][57] high-strain rate properties, [58,59] creep resistance, [60] and fatigue properties [61] based on a variety of SPD-induced features outside of the grain size alone. These and other mechanisms and properties have been well covered in reviews by Meyers et al [62] and Ovid'ko et al [63] As such, the focus for this study will return to the original guiding question: what effects do the grain size and boundary have on the strengthening of nanocrystalline metals?…”

Section: The Current State Of Severe Plastic Deformation Approachmentioning

confidence: 99%

“…[252] The primary observed benefit of this class of nanostructured materials is the excellent balance of strength and ductility as a result of the interlinked, non-homogeneous flow between the constituent microstructures. The specific critical microstructure that enables the enhanced mechanical response in heterogenous materials are nascent [57,255] and will likely depend strongly on the material's crystal structure and composition, and processing method to achieve the end combination of nanocrystalline and coarse-grained features. Several reports and perspective pieces [252,254,256] address the current state of heterostructured materials.…”

Section: B Prospects For Heterostructured Materialsmentioning

confidence: 99%

Building on Gleiter: The Foundations and Future of Deformation Processing of Nanocrystalline Metals

Mathaudhu

2020

Metall Mater Trans A

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In 1989, fueled by his prior reports and findings, Prof. Herbert Gleiter published a seminal work on the synthesis, processing, and possibilities for nanocrystalline materials. This spark exploded into the field of bulk nanocrystalline metals by severe plastic deformation processing, with the primary driver being attaining the ultimate strength of a metal through refinement of the grain sizes to a level approaching the theoretically possible limits. This paper will briefly explore the historical development of SPD and based on Turnbull's strategy of ''energizing and quenching'' materials to attain a desirable metastable state, present thoughts on incipient-related areas of exploration, including thermal stabilization through solute additions, the role of trace impurities and interstitials, the smallest grain size achievable (both theoretically and practically), and the captivating yet hazy character and role of the grain boundary. Lastly, some new approaches to making and then controlling the behavior of nanocrystalline materials will be presented. At each stage, opportunities for future study will be raised. On the 50th Anniversary of Metallurgical and Materials Transactions A, it is hoped that this report will build off the seed planted by Gleiter and inspire new work and collaborations in the years to come.

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An overview of tailoring strain delocalization for strength-ductility synergy

Cited by 318 publications

References 439 publications

Stress Corrosion Cracking in an Extruded Cu-Free Al-Zn-Mg Alloy

Stress Corrosion Cracking in an Extruded Cu-Free Al-Zn-Mg Alloy

A comprehensive study to select suitable method to enhance mechanical properties during 3D printing of metallic materials

Building on Gleiter: The Foundations and Future of Deformation Processing of Nanocrystalline Metals

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