Deformation twinning in nanocrystalline materials

doi:10.1016/J.PMATSCI.2011.05.001

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Deformation twinning in nanocrystalline materials

Journal Article•DOI•

Deformation twinning in nanocrystalline materials

Yuntian Zhu¹, Xiaozhou Liao², Xiaolei Wu³•Institutions (3)

North Carolina State University¹, University of Sydney², Chinese Academy of Sciences³

01 Jan 2012-Progress in Materials Science (Pergamon)-Vol. 57, Iss: 1, pp 1-62

TL;DR: In this paper, a review of deformation twinning in nanocrystalline materials is presented, including deformation twins observed by molecular dynamics simulations and experiments, twinning mechanisms, factors affecting the twinning, analytical models on the nucleation and growth of deformations, interactions between twins and dislocations, and the effects of twins on mechanical and other properties.

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About: This article is published in Progress in Materials Science.The article was published on 2012-01-01. It has received 1015 citations till now. The article focuses on the topics: Crystal twinning & Nanocrystalline material.

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Journal Article•DOI•

Heterogeneous lamella structure unites ultrafine-grain strength with coarse-grain ductility.

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Xiaolei Wu¹, Muxin Yang¹, Fuping Yuan¹, Guilin Wu², Yujie Wei¹, Xiaoxu Huang², Yuntian Zhu³, Yuntian Zhu⁴ - Show less +4 more•Institutions (4)

Chinese Academy of Sciences¹, Chongqing University², North Carolina State University³, Nanjing University of Science and Technology⁴

24 Nov 2015-Proceedings of the National Academy of Sciences of the United States of America

TL;DR: A heterogeneous lamella structure in Ti produced by asymmetric rolling and partial recrystallization that can produce an unprecedented property combination: as strong as ultrafine-grained metal and at the same time as ductile as conventional coarse- grained metal.

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Abstract: Grain refinement can make conventional metals several times stronger, but this comes at dramatic loss of ductility. Here we report a heterogeneous lamella structure in Ti produced by asymmetric rolling and partial recrystallization that can produce an unprecedented property combination: as strong as ultrafine-grained metal and at the same time as ductile as conventional coarse-grained metal. It also has higher strain hardening than coarse-grained Ti, which was hitherto believed impossible. The heterogeneous lamella structure is characterized with soft micrograined lamellae embedded in hard ultrafine-grained lamella matrix. The unusual high strength is obtained with the assistance of high back stress developed from heterogeneous yielding, whereas the high ductility is attributed to back-stress hardening and dislocation hardening. The process discovered here is amenable to large-scale industrial production at low cost, and might be applicable to other metal systems.

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1,063 citations

Cites background from "Deformation twinning in nanocrystal..."

...It should be noted that the real strain in the UFG lamella cannot be estimated using the grain geometry change because other deformation mechanisms such as coordinated deformation, grain boundary sliding, and grain rotation may also contribute to plastics strain when the grain sizes are very small (26)....
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Journal Article•DOI•

High entropy alloys: A focused review of mechanical properties and deformation mechanisms

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Easo P. George¹, Easo P. George², William A. Curtin³, Cemal Cem Tasan⁴•Institutions (4)

University of Tennessee¹, Oak Ridge National Laboratory², École Polytechnique Fédérale de Lausanne³, Massachusetts Institute of Technology⁴

15 Apr 2020-Acta Materialia

TL;DR: In this article, the authors provide a detailed review of the deformation mechanisms of HEAs with the complex concentrated alloys (CCAs) with the FCC and BCC structures, highlighting both successes and limitations.

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769 citations

Journal Article•DOI•

Towards strength–ductility synergy through the design of heterogeneous nanostructures in metals

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Evan Ma¹, Ting Zhu²•Institutions (2)

Johns Hopkins University¹, Georgia Institute of Technology²

01 Jul 2017-Materials Today

TL;DR: In this paper, the authors review recent advances in overcoming this tradeoff, by purposely deploying heterogeneous nanostructures in an otherwise single-phase metal, and advocate this broad vision to help guide future innovations towards a synergy between high strength and high ductility.

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611 citations

Journal Article•DOI•

Review on superior strength and enhanced ductility of metallic nanomaterials

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Ilya A. Ovid'ko¹, Ilya A. Ovid'ko², Ruslan Z. Valiev³, Ruslan Z. Valiev¹, Yuntian Zhu⁴, Yuntian Zhu⁵ - Show less +2 more•Institutions (5)

Saint Petersburg State University¹, Saint Petersburg State Polytechnic University², Ufa State Aviation Technical University³, North Carolina State University⁴, Nanjing University of Science and Technology⁵

01 May 2018-Progress in Materials Science

TL;DR: In this article, the authors present an overview of experimental data and theoretical concepts addressing the unique combination of superior strength and enhanced ductility of metallic nanomaterials, and consider the basic approaches and methods for simultaneously optimizing their strength and ductility, employing principal deformation mechanisms, crystallographic texture, chemical composition as well as second-phase nano-precipitates, carbon nanotubes and graphene.

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573 citations

Cites background from "Deformation twinning in nanocrystal..."

...12, for fcc metals, with decreasing grain size in the NC range, twinning first becomes easier, reaches an optimum grain size for twinning, and then becomes more difficult [13,128]....
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...Partial dislocation emission from GBs was first observed by molecular dynamic (MD) simulations [83,95,102,117], and later verified experimentally under high-resolution electron microscopy (HRTEM) [82,92,93]....
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...These two types of mechanisms, namly RAP and CSTP, can be differentiated under HRTEM basing on the morphology of their incoherent twin boundary (see Fig....
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...12 is very important in designing NS fcc metals for high strength and high ductility [13]....
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...HRTEM was also applied for studying the origin of GBs in Ni3Al subjected to severe deformation and annealing [172]....
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Journal Article•DOI•

Mechanical properties of high-entropy alloys with emphasis on face-centered cubic alloys

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Zezhou Li¹, Shiteng Zhao², Robert O. Ritchie², Marc A. Meyers¹•Institutions (2)

University of California, San Diego¹, Lawrence Berkeley National Laboratory²

01 May 2019-Progress in Materials Science

TL;DR: In this paper, the authors review the principal mechanical properties of multi-principal element alloys with emphasis on the face-centered cubic systems, such as the CrCoNi-based alloys, and suggest their favorable mechanical properties and ease of processing by conventional means suggest extensive utilization in many future structural applications.

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567 citations

Cites background from "Deformation twinning in nanocrystal..."

...[131] reviewed nucleation and growth mechanisms of deformation twinning....
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...(d) The sequence of forming a four-layer deformation twin by the slip of four partials with a combination of three Burgers vectors (b1, b2, and b3) on (1 1 1) slip planes [131]....
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References

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Book•

Theory of Dislocations

[...]

John Price Hirth, Jens Lothe

01 Jan 1968

TL;DR: Dislocations in Isotropic Continua: Effects of Crystal Structure on Dislocations and Dislocation-Point-Defect Interactions at Finite temperatures.

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Abstract: Dislocations in Isotropic Continua. Effects of Crystal Structure on Dislocations. Dislocation-Point-Defect Interactions at Finite Temperatures. Groups of Dislocations. Appendixes. Author and Subject Indexes.

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10,220 citations

"Deformation twinning in nanocrystal..." refers background in this paper

...A dislocation whose Burgers vector links the centers of two slip planes is defined here as a stair-rod dislocation (e.g. bd), which follows the definition by Thompson [54,76]....
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...Deformation twinning as a common deformation mechanism has been described in textbooks [53] as well as specialized books dealing with dislocations and deformation of metals [54]....
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...For example, for pure Al, which has high stacking fault energy (122 mJ/m(2) [54,144]) and...
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...40a, for the partial b1 to move, s has to perform a work to overcome increases in both the stacking fault energy and dislocation energy from lengthening segments Aa and Bb [54]....
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...(27) and (30)) as well as parameters used for the calculation [54,57,59]....
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Book•

Recrystallization and Related Annealing Phenomena

[...]

F.J. Humphreys, M. Hatherly

07 Nov 1996

TL;DR: In this paper, the authors discuss the extent to which we are able to formulate quantitative, physically-based models which can be applied to metal-forming processes, and the subjects treated in this book are all active research areas and form a major part of at least four regular international conference series.

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Abstract: Paperback. The annealing of deformed materials is of both technological importance and scientific interest. The phenomena have been most widely studied in metals, although they occur in all crystalline materials such as the natural deformation of rocks and the processing of technical ceramics. Research is mainly driven by the requirements of industry, and where appropriate, the book discusses the extent to which we are able to formulate quantitative, physically-based models which can be applied to metal-forming processes.The subjects treated in this book are all active research areas, and form a major part of at least four regular international conference series. However, there have only been two monographs published in recent times on the subject of recrystallization, the latest nearly 20 years ago. Since that time, considerable advances have been made, both in our understanding of the subject and in the techniques available to the researcher.The

...read moreread less

7,149 citations

"Deformation twinning in nanocrystal..." refers background in this paper

...For example, coarse-grained fcc metals with high stacking fault energies such as Al and Ni normally deform by dislocation slip, while fcc metals with low stacking fault energy such as Ag primarily deform by twinning [4,5]....
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Journal Article•DOI•

Bulk nanostructured materials from severe plastic deformation

[...]

Ruslan Z. Valiev¹, Rinat K. Islamgaliev¹, Igor V. Alexandrov¹•Institutions (1)

Ufa State Aviation Technical University¹

01 Mar 2000-Progress in Materials Science

TL;DR: In this article, the authors present methods of severe plastic deformation and formation of nanostructures, including Torsion straining under high pressure, ECA pressing, and multiple forging.

...read moreread less

5,763 citations

Journal Article•DOI•

Mechanical properties of nanocrystalline materials

[...]

Marc A. Meyers¹, A. Mishra¹, David J. Benson¹•Institutions (1)

University of California, San Diego¹

01 May 2006-Progress in Materials Science

TL;DR: The mechanical properties of nanocrystalline materials are reviewed in this paper, with emphasis on their constitutive response and on the fundamental physical mechanisms, including the deviation from the Hall-Petch slope and possible negative slope, the effect of porosity, the difference between tensile and compressive strength, the limited ductility, the tendency for shear localization, fatigue and creep responses.

...read moreread less

3,828 citations

Journal Article•DOI•

Ultrahigh strength and high electrical conductivity in copper

[...]

Lei Lu¹, Yongfeng Shen¹, Xianhua Chen¹, Lihua Qian¹, Kathy Lu¹ - Show less +1 more•Institutions (1)

Chinese Academy of Sciences¹

16 Apr 2004-Science

TL;DR: Pure copper samples with a high density of nanoscale growth twins are synthesized and show a tensile strength about 10 times higher than that of conventional coarse-grained copper, while retaining an electrical conductivity comparable to that of pure copper.

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Abstract: Methods used to strengthen metals generally also cause a pronounced decrease in electrical conductivity, so that a tradeoff must be made between conductivity and mechanical strength. We synthesized pure copper samples with a high density of nanoscale growth twins. They showed a tensile strength about 10 times higher than that of conventional coarse-grained copper, while retaining an electrical conductivity comparable to that of pure copper. The ultrahigh strength originates from the effective blockage of dislocation motion by numerous coherent twin boundaries that possess an extremely low electrical resistivity, which is not the case for other types of grain boundaries.

...read moreread less

2,584 citations