Journal ArticleDOI
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
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Effects of temperature, strain rate and specimen size on the deformation behaviors at micro/meso-scale in ultrafine-grained pure Al
TL;DR: In this paper, an ultrafine-grained (UFG) high purity (99.999%) aluminum with the average grain size of ~ 1.0μm was processed using equal-channel angular pressing (ECAP) through 8 passes.
Journal ArticleDOI
Tensile and fracture toughness behaviour of ultrafine grained Mg-4Zn-4Gd alloy processed through hot rolling followed by hot pressing
TL;DR: In this paper, a hybrid severe plastic deformation (HSPD) was performed at 450°C to produce ultrafine-grains (UFG) in Mg-4Zn-4Gd, which was compared with conventional 75% hot rolled, solutionized and as-cast (AC) specimens to study the mechanical and microstructural evolution.
Journal ArticleDOI
High temperature thermal stability of nanocrystalline 316L stainless steel processed by high-pressure torsion
Moustafa El-Tahawy,Moustafa El-Tahawy,Yi Huang,Hyelim Choi,Heeman Choe,János L. Lábár,János L. Lábár,Terence G. Langdon,Jenő Gubicza +8 more
TL;DR: Differential scanning calorimetry (DSC) was used to study the thermal stability of the microstructure and the phase composition in nanocrystalline 316L stainless steel processed by high pressure torsion (HPT) for ¼ and 10 turns as mentioned in this paper.
Journal ArticleDOI
Direct Bonding of Aluminum-Copper Metals through High-Pressure Torsion Processing
Jae Kyung Han,Dae Kuen Han,Guang Yuan Liang,Jae-il Jang,Terence G. Langdon,Megumi Kawasaki,Megumi Kawasaki +6 more
TL;DR: In this article, the formation of a new metal system by the direct bonding of separate disks of Al and Cu by processing at room temperature under a compressive pressure of 6.0 GPa and with increasing numbers of HPT turns up to 60.
Journal ArticleDOI
Recent Advances in Processing and Application of Nanostructured Titanium for Dental Implants
Alexander V. Polyakov,Ludĕk Dluhoš,G.S. Dyakonov,Georgy I. Raab,Ruslan Z. Valiev,Ruslan Z. Valiev +5 more
TL;DR: In this article, the use of nano-Ti rods allows for creation of dental implants with improved design and a smaller diameter, and the results of successful clinical trials are presented, with UTS 1330MPa and endurance limit based on 10 7 cycles of 620MPa.
References
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Journal ArticleDOI
The Deformation and Ageing of Mild Steel: III Discussion of Results
TL;DR: In this paper, an attempt is made to explain the observed phenomena in the yielding and ageing of mild steel, described in two previous papers, in the general terms of a grain-boundary theory.
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Bulk nanostructured materials from severe plastic deformation
TL;DR: In this article, the authors present methods of severe plastic deformation and formation of nanostructures, including Torsion straining under high pressure, ECA pressing, and multiple forging.
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Principles of equal-channel angular pressing as a processing tool for grain refinement
TL;DR: In this article, a review examines recent developments related to the use of ECAP for grain refinement including modifying conventional ECAP to increase the process efficiency and techniques for up-scaling the procedure and for the processing of hard-to-deform materials.
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Using high-pressure torsion for metal processing: Fundamentals and applications
TL;DR: High pressure torsion (HPT) is a well-known technique for metal forming as discussed by the authors, where samples are subjected to a compressive force and concurrent torsional straining.
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Diffusional Viscosity of a Polycrystalline Solid
TL;DR: In this article, it is suggested that mosaic boundaries and boundaries between grains of nearly the same orientation may not serve as sources or sinks of the diffusion currents, in which case the creep rate will depend only on the configuration of grain boundaries having a sizable orientation differen...