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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
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
Application of equal channel angular pressing with parallel channels for grain refinement in aluminium alloys and its effect on deformation behavior
Ilchat Sabirov,María Teresa Pérez-Prado,Maxim Yu. Murashkin,Jon M. Molina-Aldareguia,Elena V. Bobruk,N.F. Yunusova,Ruslan Z. Valiev +6 more
TL;DR: In this paper, an equiaxed ultra-fine grained (UFG) microstructure is formed in the Al 6061 alloy after ECAP-PC for 4 passes.
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Effect of temperature on the processing of a magnesium alloy by high-pressure torsion
Yi Huang,Roberto B. Figueiredo,Thierry Baudin,Anne-Laure Helbert,François Brisset,Terence G. Langdon,Terence G. Langdon +6 more
TL;DR: In this paper, the evolution of hardness of a magnesium alloy processed by high-pressure torsion at different temperatures was analyzed by determining the hardness of the alloy at different stages of deformation.
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The significance of grain boundary sliding in the superplastic Zn–22 % Al alloy processed by ECAP
TL;DR: In this article, a Zn-22% Al eutectoid alloy was processed by equal-channel angular pressing (ECAP) to reduce the grain size to 0.8μm.
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High-strain dislocation patterning, texture formation and shear banding of wavy glide materials in the LEDS theory
TL;DR: In this article, the authors show that the most common dislocation boundaries are dislocation rotation boundaries separating misoriented volume elements, which form the so widely observed mosaic block alias dislocation cell structures of “wavy glide” materials.
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Micro-extrusion of ultrafine grained copper
TL;DR: In this paper, the authors investigated the possibility of using an ultrafine grained (UFG) metal for micro-extrusion and compared the extrusion force, grain flow, shape representation and surface quality of the extruded micro-components.