scholarly journals Effect of strain rate in severe plastic deformation on microstructure refinement and stored energies

2011 ◽  
Vol 26 (3) ◽  
pp. 395-406 ◽  
Author(s):  
Shashank Shekhar ◽  
Jiazhao Cai ◽  
Saurabh Basu ◽  
Sepideh Abolghasem ◽  
M. Ravi Shankar
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Strain Rate ◽  
Microstructure Refinement ◽  
Image Position

Abstract

Severe plastic deformation of copper by machining: Microstructure refinement and nanostructure evolution with strain

2007 ◽  
Vol 56 (12) ◽  
pp. 1047-1050 ◽  
Author(s):  
S. Swaminathan ◽  
T.L. Brown ◽  
S. Chandrasekar ◽  
T.R. McNelley ◽  
W.D. Compton
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Microstructure Refinement

Superplasticity in a 5024 Aluminium Alloy Processed by Severe Plastic Deformation

2012 ◽  
Vol 735 ◽  
pp. 353-358 ◽  
Author(s):  
Anna Mogucheva ◽  
Diana Tagirova ◽  
Rustam Kaibyshev
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Strain Rate ◽  
Aluminium Alloy ◽  
Initial Strain Rate ◽  
Strain Rates ◽  
Superplastic Behaviour ◽  
Angular Pressing ◽  
Elongation To Failure ◽  
Zr Alloy

The superplastic behaviour of an Al-4.6%Mg-0.35%Mn-0.2%Sc-0.09%Zr alloy was studied in the temperature range 250-500°C at strain rates ranging from 10-4 to 10-1 s-1. The AA5024 was subjected to equal channel angular pressing (ECAP) at 300°C up to ~12. The highest elongation-to-failure of ∼3300% was attained at a temperature of 450°C and an initial strain rate of 5.6×10-1 s-1. Regularities of superplastic behaviour of the 5024 aluminium alloy are discussed.

Mapping dislocation densities resulting from severe plastic deformation using large strain machining

2018 ◽  
Vol 33 (22) ◽  
pp. 3762-3773
Author(s):  
Sepideh Abolghasem ◽  
Saurabh Basu ◽  
Shashank Shekhar ◽  
M. Ravi Shankar
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Large Strain ◽  
Dislocation Densities ◽  
Image Position

Abstract

High strain rate superplasticity of submicrometer grained 5083 Al alloy containing scandium fabricated by severe plastic deformation

2003 ◽  
Vol 341 (1-2) ◽  
pp. 273-281 ◽  
Author(s):  
Kyung-Tae Park ◽  
Duck-Young Hwang ◽  
Young-Kook Lee ◽  
Young-Kuk Kim ◽  
Dong Hyuk Shin
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Al Alloy ◽  
5083 Al Alloy

Effect of Severe Plastic Deformation in Machining Elucidated via Rate-Strain-Microstructure Mappings

2012 ◽  
Vol 134 (3) ◽  
Author(s):  
S. Shekhar ◽  
S. Abolghasem ◽  
S. Basu ◽  
J. Cai ◽  
M. R. Shankar
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Strain Rate ◽  
Deformation Zone ◽  
Fine Grained ◽  
Orthogonal Machining ◽  
Deformation Parameters ◽  
Strain And Strain Rate ◽  
One To One ◽  
Surface Microstructures

Machining induces severe plastic deformation (SPD) in the chip and on the surface to stimulate dramatic microstructural transformations which can often result in a manufactured component with a fine-grained surface. The aim of this paper is to study the one-to-one mappings between the thermomechanics of deformation during chip formation and an array of resulting microstructural characteristics in terms of central deformation parameters–strain, strain-rate, temperature, and the corresponding Zener–Hollomon (ZH) parameter. Here, we propose a generalizable rate-strain-microstructure (RSM) framework for relating the deformation parameters to the resulting deformed grain size and interface characteristics. We utilize Oxley’s model to calculate the strain and strain-rate for a given orthogonal machining condition which was also validated using digital imaging correlation-based deformation field characterization. Complementary infrared thermography in combination with a modified-Oxley’s analysis was utilized to characterize the temperature in the deformation zone where the SPD at high strain-rates is imposed. These characterizations were utilized to delineate a suitable RSM phase-space composed of the strain as one axis and the ZH parameter as the other. Distinctive one-to-one mappings of various microstructures corresponding to an array of grain sizes and grain boundary distributions onto unique subspaces of this RSM space are shown. Building on the realization that the microstructure on machined surfaces is closely related to the chip microstructure derived from the primary deformation zone, this elucidation is expected to offer a reliable approach for controlling surface microstructures from orthogonal machining.

A study of the interactive effects of strain, strain rate and temperature in severe plastic deformation of copper

2009 ◽  
Vol 57 (18) ◽  
pp. 5491-5500 ◽  
Author(s):  
Travis L. Brown ◽  
Christopher Saldana ◽  
Tejas G. Murthy ◽  
James B. Mann ◽  
Yang Guo ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Strain Rate ◽  
Interactive Effects

scholarly journals Dynamic High Pressure Torsion (DHPT)—A Novel Method for High Strain Rate Severe Plastic Deformation

Proceedings ◽  
2018 ◽  
Vol 2 (8) ◽  
pp. 493 ◽  
Author(s):  
Harishchandra Lanjewar ◽  
Leo Kestens ◽  
Patricia Verleysen
Keyword(s):  
Plastic Deformation ◽  
High Pressure ◽  
Severe Plastic Deformation ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
High Pressure Torsion ◽  
Pure Aluminum ◽  
High Deformation ◽  
Fine Grained

Metals with a fine-grained microstructure have exceptional mechanical properties. Severe plastic deformation (SPD) is one of the most successful ways to fabricate ultrafine-grained (UFG) and nanostructured (NC) materials. Most of the SPD techniques employ very low processing speeds. However, the lowest steady-state grain size which can be obtained by SPD is considered to be inversely proportional with the strain rate at which the severe deformation is imposed. In order to overcome this limitation, methods operating at higher rates have been envisaged and used to study the fragmentation process and the properties of the obtained materials. However, almost none of these methods, employ hydrostatic pressures which are needed to prevent the material from failing at high deformation strains. As such, their applicability is limited to materials with a high intrinsic ductility. Additionally, in some methods the microstructural changes are limited to the surface layers of the material. To circumvent these restrictions, a novel facility has been designed and developed which deforms the material at high strain rate under high hydrostatic pressures. Using the facility, commercially pure aluminum was processed and analysis of the deformed material was performed. The microstructure evolution in this material was compared with that observed in static high pressure torsion (HPT) processed material.

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