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Twenty-five years of ultrafine-grained materials: achieving exceptional properties through grain refinement
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In this article, an overview of the more recent developments in this field, with special emphasis on the opportunities for achieving homogeneity in the as-processed materials and on the general characteristics of the mechanical properties achieved after SPD processing.About:
This article is published in Acta Materialia.The article was published on 2013-11-01. It has received 614 citations till now.read more
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Heterogeneous lamella structure unites ultrafine-grain strength with coarse-grain ductility.
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.
Journal ArticleDOI
Review on superior strength and enhanced ductility of metallic nanomaterials
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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A review on high-pressure torsion (HPT) from 1935 to 1988
TL;DR: In this article, the authors reviewed the findings of Bridgman and his successors from 1935 to 1988 using the HPT method and summarized their historical importance in recent advancement of materials, properties, phase transformations and HPT machine designs.
Journal ArticleDOI
Producing Bulk Ultrafine-Grained Materials by Severe Plastic Deformation: Ten Years Later
Ruslan Z. Valiev,Ruslan Z. Valiev,Yuri Estrin,Yuri Estrin,Zenji Horita,Terence G. Langdon,Terence G. Langdon,Michael J. Zehetbauer,Yuntian Zhu,Yuntian Zhu +9 more
TL;DR: The use of severe plastic deformation (SPD) has been extensively studied in the last decade as discussed by the authors, leading to the introduction of a range of nanostructural features, including nonequilibrium grain boundaries, deformation twins, dislocation substructures, vacancy agglomerates, and solute segregation and clustering.
Journal ArticleDOI
Fundamentals of superior properties in bulk NanoSPD materials
Ruslan Z. Valiev,Yuri Estrin,Zenji Horita,Terence G. Langdon,Terence G. Langdon,Michael J. Zehetbauer,Yuntian Zhu,Yuntian Zhu +7 more
TL;DR: In this article, the authors provide a critical overview of the properties of bulk nanoSPD materials, with a focus on the fundamentals for the observed extraordinary properties, including the unique nanostructures that lead to the superior properties, the underlying deformation mechanisms, critical issues that remain to be investigated, future research directions, and the application potential of such materials.
References
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Journal ArticleDOI
Twenty-five years of severe plastic deformation: recent developments in evaluating the degree of homogeneity through the thickness of disks processed by high-pressure torsion
TL;DR: In this article, the hardness values on the surfaces of disks gradually evolve with increasing strain to give a reasonably high level of homogeneity, and experiments were conducted to determine whether this high level homogeneity extends also through the thickness of the disks or whether inhomogeneities occur in the axial direction.
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Influence of high-pressure torsion on microstructural evolution in an Al–Zn–Mg–Cu alloy
Zhi Chao Duan,Xiaozhou Liao,Megumi Kawasaki,Roberto B. Figueiredo,Terence G. Langdon,Terence G. Langdon +5 more
TL;DR: A commercial age-hardenable Al-7136 alloy was successfully processed by high-pressure torsion (HPT) at room temperature through 1/8 to 4 turns as mentioned in this paper.
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Identifying creep mechanisms in plastic flow
TL;DR: In this article, the authors classified the mechanisms occurring in plastic flow at elevated temperatures into three distinct classes depending upon whether they are intragranular dislocation mechanisms, grain boundary sliding including superplasticity or diffusion creep occurring through vacancy flow.
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Finite element analysis of the effect of the inner corner angle in equal channel angular pressing
Seung Chae Yoon,Hyoung Seop Kim +1 more
TL;DR: The inner corner angle (ICA) is one of the major factors affecting deformation homogeneity in workpieces during equal channel angular pressing (ECAP), and the effect of ICA on the plastic deformation behavior in ECAP was investigated using the finite element method as mentioned in this paper.
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Effect of aging on microstructural development in an Al–Mg–Si alloy processed by high-pressure torsion
Aicha Loucif,Roberto B. Figueiredo,Megumi Kawasaki,Megumi Kawasaki,Thierry Baudin,François Brisset,R. Chemam,Terence G. Langdon,Terence G. Langdon +8 more
TL;DR: In this article, the microstructural evolution of a commercial Al-0.6 % Mg 0.4 % Si alloy processed using high-pressure torsion for up to 20 turns was evaluated.