Evolution of mechanical properties and microstructures with equivalent strain in Pure Fe processed by High Pressure Torsion

Kaveh Edalati, Tadayoshi Fujioka, Zenji Horita

Research output: Contribution to journalArticle

96 Citations (Scopus)

Abstract

Pure Fe (99.96%) was processed by high pressure torsion (HPT) using disc and ring samples. When the microhardness and tensile properties are plotted against the equivalent strain, the individual properties fall well on unique single curves, level off at the equivalent strain of ̃40. At the saturated level, the tensile strength of 1050 MPa and the elongation to failure of 2% are attained. Transmission electron microscopy showed that a subgrain structure containing dislocations develops at an initial stage of straining. More dislocations form within the grains and the subgrain size decreases with further straining. At the saturation stage, the average grain size reaches ̃200 nm, the misorientation angle increases and some grains which are free from dislocations appear. It is suggested that at the saturation stage, a steady state condition should be established through a balance between hardening by dislocation generation and softening by recrystallization.

Original languageEnglish
Pages (from-to)44-50
Number of pages7
JournalMaterials Transactions
Volume50
Issue number1
DOIs
Publication statusPublished - Jan 1 2009

Fingerprint

Torsional stress
torsion
mechanical properties
Mechanical properties
microstructure
Microstructure
Tensile properties
Microhardness
Hardening
Elongation
Tensile strength
Transmission electron microscopy
saturation
tensile properties
misalignment
hardening
softening
microhardness
tensile strength
elongation

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Evolution of mechanical properties and microstructures with equivalent strain in Pure Fe processed by High Pressure Torsion. / Edalati, Kaveh; Fujioka, Tadayoshi; Horita, Zenji.

In: Materials Transactions, Vol. 50, No. 1, 01.01.2009, p. 44-50.

Research output: Contribution to journalArticle

@article{b882f4b406c6423aaf7929020325c340,
title = "Evolution of mechanical properties and microstructures with equivalent strain in Pure Fe processed by High Pressure Torsion",
abstract = "Pure Fe (99.96{\%}) was processed by high pressure torsion (HPT) using disc and ring samples. When the microhardness and tensile properties are plotted against the equivalent strain, the individual properties fall well on unique single curves, level off at the equivalent strain of ̃40. At the saturated level, the tensile strength of 1050 MPa and the elongation to failure of 2{\%} are attained. Transmission electron microscopy showed that a subgrain structure containing dislocations develops at an initial stage of straining. More dislocations form within the grains and the subgrain size decreases with further straining. At the saturation stage, the average grain size reaches ̃200 nm, the misorientation angle increases and some grains which are free from dislocations appear. It is suggested that at the saturation stage, a steady state condition should be established through a balance between hardening by dislocation generation and softening by recrystallization.",
author = "Kaveh Edalati and Tadayoshi Fujioka and Zenji Horita",
year = "2009",
month = "1",
day = "1",
doi = "10.2320/matertrans.MD200812",
language = "English",
volume = "50",
pages = "44--50",
journal = "Materials Transactions",
issn = "0916-1821",
publisher = "The Japan Institute of Metals and Materials",
number = "1",

}

TY - JOUR

T1 - Evolution of mechanical properties and microstructures with equivalent strain in Pure Fe processed by High Pressure Torsion

AU - Edalati, Kaveh

AU - Fujioka, Tadayoshi

AU - Horita, Zenji

PY - 2009/1/1

Y1 - 2009/1/1

N2 - Pure Fe (99.96%) was processed by high pressure torsion (HPT) using disc and ring samples. When the microhardness and tensile properties are plotted against the equivalent strain, the individual properties fall well on unique single curves, level off at the equivalent strain of ̃40. At the saturated level, the tensile strength of 1050 MPa and the elongation to failure of 2% are attained. Transmission electron microscopy showed that a subgrain structure containing dislocations develops at an initial stage of straining. More dislocations form within the grains and the subgrain size decreases with further straining. At the saturation stage, the average grain size reaches ̃200 nm, the misorientation angle increases and some grains which are free from dislocations appear. It is suggested that at the saturation stage, a steady state condition should be established through a balance between hardening by dislocation generation and softening by recrystallization.

AB - Pure Fe (99.96%) was processed by high pressure torsion (HPT) using disc and ring samples. When the microhardness and tensile properties are plotted against the equivalent strain, the individual properties fall well on unique single curves, level off at the equivalent strain of ̃40. At the saturated level, the tensile strength of 1050 MPa and the elongation to failure of 2% are attained. Transmission electron microscopy showed that a subgrain structure containing dislocations develops at an initial stage of straining. More dislocations form within the grains and the subgrain size decreases with further straining. At the saturation stage, the average grain size reaches ̃200 nm, the misorientation angle increases and some grains which are free from dislocations appear. It is suggested that at the saturation stage, a steady state condition should be established through a balance between hardening by dislocation generation and softening by recrystallization.

UR - http://www.scopus.com/inward/record.url?scp=60849118935&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=60849118935&partnerID=8YFLogxK

U2 - 10.2320/matertrans.MD200812

DO - 10.2320/matertrans.MD200812

M3 - Article

AN - SCOPUS:60849118935

VL - 50

SP - 44

EP - 50

JO - Materials Transactions

JF - Materials Transactions

SN - 0916-1821

IS - 1

ER -