Journal ArticleDOI
An investigation of ductility and microstructural evolution in an Al−3% Mg alloy with submicron grain size
Jingtao Wang,Zenji Horita,Minoru Furukawa,Minoru Nemoto,Nikolai K. Tsenev,Ruslan Z. Valiev,Yan Ma,Terence G. Langdon +7 more
TLDR
In this paper, a submicrometer-grained (SMG) Al−3% Mg solid solution alloy, with an initial grain size of ∼0.2 μm, was produced by intense plastic straining.Abstract:
A submicrometer-grained (SMG) Al−3% Mg solid solution alloy, with an initial grain size of ∼0.2 μm, was produced by intense plastic straining. Experiments show that tensile specimens of the SMG alloy exhibit high elongations to failure at low testing strain rates at the relatively low temperature of 403 K. The stress exponent is high (∼7–8) and calculations show deformation is within the region of power-law breakdown. The initial microstructure of the alloy consists of diffuse boundaries between highly deformed grains. At strain rates of ∼10−4 s−1 and lower, plastic deformation leads to dynamic recrystallization and the formation of highly nonequilibrium grain boundaries that gradually evolve into a more equilibrated configuration.read more
Citations
More filters
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
Principle of equal-channel angular pressing for the processing of ultra-fine grained materials
TL;DR: In this paper, it has been shown that submicrometer-grained structures may be produced in a wide range of materials (e.g. pure metals, metallic alloys including superalloys, intermetallics, semiconductors) by subjecting these materials to a very high plastic strain using either equal-channel angular (ECA) pressing or torsion straining under high pressure.
Journal ArticleDOI
The process of grain refinement in equal-channel angular pressing
TL;DR: In this article, experiments were conducted on high purity aluminum to investigate the process of grain refinement during equal-channel angular (ECA) pressing, where samples were subjected to 1 to 4 pressings and then sectioned for microstructural examination in three mutually perpendicular directions.
Journal ArticleDOI
An investigation of microstructural evolution during equal-channel angular pressing
TL;DR: In this article, the development of an ultra-fine grain size during equal-channel angular (ECA) pressing of high purity aluminum with an initial grain size of ∼1.0 mm was investigated.
Journal ArticleDOI
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.
References
More filters
Journal ArticleDOI
Plastic deformation of alloys with submicron-grained structure
TL;DR: In this article, the peculiarities of a submicron-grained structure formation in a series of aluminium and magnesium-based alloys by means of a special strain-heat treatment are examined.
BookDOI
Mechanical properties and deformation behavior of materials having ultra-fine microstructures
TL;DR: The fundamental concepts structure and physical properties mechanical response superplasticity nanoindentation synthesis and processing characterization are discussed in this paper. But the focus of this paper is on nano-indentations.
Journal ArticleDOI
The mechanical properties of superplastic materials
TL;DR: The relationship between stress and strain rate is often sigmoidal in superplastic materials, with a low strain rate sensitivity at low and high strain rates (regions I and III, respectively) and a high strain rate sensitive at intermediate strain rate (region II) where the material exhibits optimal super-plasticity as discussed by the authors.
Journal ArticleDOI
Deformation mechanism maps based on grain size
TL;DR: In this article, the relative contributions of various deformation processes are estimated as a function of stress at different grain sizes, and a simple method of constructing these maps is presented, requiring only a knowledge of the relevant constitutive equations for the various mechanisms and a minimum of calculation.