Journal ArticleDOI
Development of hardness homogeneity and superplastic behavior in an aluminum–copper eutectic alloy processed by high-pressure torsion
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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.Abstract:
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. Examination after processing showed a gradual evolution to a reasonable level of hardness and microstructural homogeneity after 5 or more turns. Tensile tests were conducted at a temperature of 723 K on specimens processed through 5 and 10 turns of HPT. These specimens exhibited excellent superplastic properties with a maximum elongation of ∼1250% at strain rates lower than 10−3 s−1. The results also showed that the maximum elongation is displaced to a faster strain rate when the HPT processing is conducted to a higher number of turns. An analysis demonstrates that superplastic flow in the Al–Cu alloy processed by HPT is well described by a theoretical relationship that was developed for conventional superplastic materials.read more
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Twenty-five years of ultrafine-grained materials: achieving exceptional properties through grain refinement
TL;DR: 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.
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Different models of hardness evolution in ultrafine-grained materials processed by high-pressure torsion
TL;DR: In this paper, a review of recent discoveries in the experimental results on hardness evolution toward homogeneity during HPT processing and discuss the different models of hardness developments with respect to imposed equivalent strain by HPT for a range of metals and alloys.
Journal ArticleDOI
Advances in ultrafine-grained materials
TL;DR: In this article, the major procedures of equal-channel angular pressing and high-pressure torsion of ultrafine-grained (UFG) materials are discussed and compared.
Journal ArticleDOI
Review: achieving superplastic properties in ultrafine-grained materials at high temperatures
TL;DR: In this article, a review examines recent results that demonstrate the occurrence of exceptional superplastic flow in a series of UFG aluminum and magnesium alloys after ECAP and HPT.
Journal ArticleDOI
Ultrafine-grained magnesium–lithium alloy processed by high-pressure torsion: Low-temperature superplasticity and potential for hydroforming
TL;DR: In this paper, a Mg-Li alloy was processed by severe plastic deformation (SPD) through the process of high pressure torsion (HPT) to achieve ultrafine grains with an average grain size of ~500nm.
References
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Journal ArticleDOI
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.
Journal ArticleDOI
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.
Journal ArticleDOI
Experimental parameters influencing grain refinement and microstructural evolution during high-pressure torsion
Alexander P. Zhilyaev,Alexander P. Zhilyaev,G.V. Nurislamova,B.-K. Kim,Maria Dolors Baró,Jerzy A. Szpunar,Terence G. Langdon +6 more
TL;DR: In this paper, a simple model is proposed to explain the development of a homogeneous microstructure in high pressure torsion (HPT) processing of pure nickel samples, showing that the distributions of grain boundary misorientations are similar in the center and at the periphery of the samples.
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Structure and deformaton behaviour of Armco iron subjected to severe plastic deformation
TL;DR: In this paper, structural evolutions in an Armco iron subjected to severe plastic deformation by torsion under high pressure are anlysed with conventional and high resolution electron microscopes.
Journal ArticleDOI
A unified approach to grain boundary sliding in creep and superplasticity
TL;DR: In this paper, a unified model is developed for Rachinger boundary sliding at all grain sizes, where the rate of sliding is controlled by the rates of accomodation through intragranular slip.