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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.
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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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Continuous high-pressure torsion using wires
TL;DR: In this paper, a continuous high-pressure torsion (CHPT) method was used for continuous processing of metallic wires, and the results of hardness measurements were consistent with those of conventional HPT using disk and ring specimens.
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Constructing a deformation mechanism map for a superplastic Pb–Sn alloy processed by equal-channel angular pressing
TL;DR: In this article, the Pb-62% Sn eutectic alloy was processed by equal-channel angular pressing and then tested in tension at a temperature of 413 K. The results showed increasing superplastic elongations with decreasing strain rate including elongations up to >3000% at the lowest strain rate.
Journal Article
AGING BEHAVIOR AND PROPERTIES OF ULTRAFINE- GRAINED ALUMINUM ALLOYS OF Al-Mg-Si SYSTEM
TL;DR: In this paper, the features of ultrafine-grained (UFG) structure formation, mechanical properties and electrical conductivity of the aluminum alloys of Al-Mg-Si system subjected to severe plastic deformation (SPD).
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Development of hardness homogeneity and superplastic behavior in an aluminum–copper eutectic alloy processed by high-pressure torsion
TL;DR: In this paper, an Al-33% Cu eutectic alloy was processed by high pressure torsion (HPT) at a pressure of 6.0 GPa for 1/4 to 10 turns, and tensile tests were conducted at a temperature of 723 K on specimens processed through 5 and 10 turns of HPT.
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Structural and hardness inhomogeneities in Mg–Al–Zn alloys processed by high-pressure torsion
TL;DR: In this paper, experiments were conducted to evaluate the evolution of structure and hardness in processing by high pressure torsion (HPT) of the magnesium AZ91 and AZ31 alloys.