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Twenty-five years of ultrafine-grained materials: achieving exceptional properties through grain refinement
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TLDR
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
Citations
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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
Using finite element modeling to examine the temperature distribution in quasi-constrained high-pressure torsion
Roberto B. Figueiredo,Pedro Henrique R. Pereira,Maria Teresa Paulino Aguilar,Paulo Roberto Cetlin,Terence G. Langdon,Terence G. Langdon +5 more
TL;DR: In this article, the authors used finite element modeling with an analytical component to evaluate the thermal characteristics in quasi-constrained high pressure torsion (HPT) processing.
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Relationship between texture and low temperature superplasticity in an extruded AZ31 Mg alloy processed by ECAP
TL;DR: In this article, the development of low temperature superplasticity and texture is examined in an AZ31 Mg alloy after extrusion and processing by equal-channel angular pressing (ECAP).
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Factors influencing the equilibrium grain size in equal-channel angular pressing: Role of Mg additions to aluminum
TL;DR: In this article, the equal-channel angular (ECA) pressing of Al-1 pct Mg and Al-3 pct mg solid-solution alloys with pure Al was compared.
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Influence of stacking-fault energy on microstructural characteristics of ultrafine-grain copper and copper-zinc alloys
Levente Balogh,Tamás Ungár,Yonghao Zhao,Yuntian Zhu,Zenji Horita,Cheng Xu,Terence G. Langdon,Terence G. Langdon +7 more
TL;DR: In this article, the influence of stacking-fault energy (SFE) on microstructural development when processing using high-pressure torsion (HPT) was evaluated using transmission electron microscopy, X-ray diffraction and hardness measurements.
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On the die corner gap formation in equal channel angular pressing
TL;DR: In this article, the DEFORM2D code is used to investigate the corner gap formation between the die and workpiece during the plane strain angular pressing (ECAP) process, where the adjustment of the corner angle from the die corner angle to the arc curvature of the workpiece is necessary for a better prediction of the strain during ECAP.