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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
Stable and Unstable Flow in Materials Processed by Equal-Channel Angular Pressing with an Emphasis on Magnesium Alloys
Roberto B. Figueiredo,Roberto B. Figueiredo,Paulo Roberto Cetlin,Terence G. Langdon,Terence G. Langdon +4 more
TL;DR: In this paper, the authors used finite element modeling (FEM) to examine the flow process during ECAP with an emphasis on the importance of the strain-rate sensitivity m. The simulations show that the presence of a back pressure increases the ability of the billet to fill the exit channel but does not remove the development of plastic instabilities such as shear concentrations.
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Long-length ultrafine-grained titanium rods produced by ECAP- conform
TL;DR: In this paper, a new technique of continuous severe plastic deformation (SPD)-processing, i.e., ECAP (equal channel angular pressing)-Conform, is applied for the first time to produce long-length rods of commercial purity Ti with ultrafine-grained structure.
Journal ArticleDOI
Analysis of plastic flow during high-pressure torsion
Roberto B. Figueiredo,Maria Teresa Paulino Aguilar,Paulo Roberto Cetlin,Terence G. Langdon,Terence G. Langdon +4 more
TL;DR: In this paper, a finite element modeling (FEM) was used to simulate processing by high-pressure torsion under quasi-constrained conditions using three different material conditions: strain-hardening, perfect-plastic, and flow-softening.
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Hardness homogeneity and micro-tensile behavior in a magnesium AZ31 alloy processed by equal-channel angular pressing
Jie Xu,Jie Xu,Mahmood Shirooyeh,Jittraporn Wongsa-Ngam,Debin Shan,Bin Guo,Terence G. Langdon,Terence G. Langdon +7 more
TL;DR: A magnesium AZ31 alloy was processed by equal-channel angular pressing (ECAP) at a temperature of 473 K using a die with a channel angle of 110° as mentioned in this paper.
Journal ArticleDOI
Grain boundary sliding in a superplastic zinc-aluminum alloy processed using severe plastic deformation
TL;DR: In this paper, a Zn-22% Al eutectoid alloy was processed by Equal Channel Angular Processing (ECAP) to produce a grain size of?0.8?m.