Microstructural evolution in high purity aluminum processed by ECAP

Megumi Kawasaki, Zenji Horita, Terence G. Langdon

Research output: Contribution to journalArticle

181 Citations (Scopus)

Abstract

High purity (99.99%) aluminum was processed by equal-channel angular pressing (ECAP) through 1-12 passes and examined using orientation imaging microscopy. The results reveal two distinct processing regimes: from 1 to 4 passes the microstructure evolves from elongated subgrains to an essentially equiaxed array of ultrafine grains and from 4 to 12 passes there is no measurable change in the average grain size and grain aspect ratio. The boundary misorientation angle and the fraction of high-angle boundaries increase rapidly up to 4 passes and at a slower rate from 4 to 12 passes. Anomalously large grains were visible in the central region of the billet pressed through 12 passes due to dynamic recovery and grain growth. The results suggest optimum processing is achieved by pressing through 4-8 passes.

Original languageEnglish
Pages (from-to)143-150
Number of pages8
JournalMaterials Science and Engineering A
Volume524
Issue number1-2
DOIs
Publication statusPublished - Oct 25 2009

Fingerprint

Equal channel angular pressing
Microstructural evolution
pressing
Aluminum
purity
aluminum
Processing
Grain growth
Aspect ratio
Microscopic examination
Imaging techniques
Recovery
billets
Microstructure
misalignment
aspect ratio
grain size
recovery
microscopy
microstructure

All Science Journal Classification (ASJC) codes

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

Cite this

Microstructural evolution in high purity aluminum processed by ECAP. / Kawasaki, Megumi; Horita, Zenji; Langdon, Terence G.

In: Materials Science and Engineering A, Vol. 524, No. 1-2, 25.10.2009, p. 143-150.

Research output: Contribution to journalArticle

Kawasaki, Megumi ; Horita, Zenji ; Langdon, Terence G. / Microstructural evolution in high purity aluminum processed by ECAP. In: Materials Science and Engineering A. 2009 ; Vol. 524, No. 1-2. pp. 143-150.
@article{237d7712b87d482db9f8efbf748100ad,
title = "Microstructural evolution in high purity aluminum processed by ECAP",
abstract = "High purity (99.99{\%}) aluminum was processed by equal-channel angular pressing (ECAP) through 1-12 passes and examined using orientation imaging microscopy. The results reveal two distinct processing regimes: from 1 to 4 passes the microstructure evolves from elongated subgrains to an essentially equiaxed array of ultrafine grains and from 4 to 12 passes there is no measurable change in the average grain size and grain aspect ratio. The boundary misorientation angle and the fraction of high-angle boundaries increase rapidly up to 4 passes and at a slower rate from 4 to 12 passes. Anomalously large grains were visible in the central region of the billet pressed through 12 passes due to dynamic recovery and grain growth. The results suggest optimum processing is achieved by pressing through 4-8 passes.",
author = "Megumi Kawasaki and Zenji Horita and Langdon, {Terence G.}",
year = "2009",
month = "10",
day = "25",
doi = "10.1016/j.msea.2009.06.032",
language = "English",
volume = "524",
pages = "143--150",
journal = "Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing",
issn = "0921-5093",
publisher = "Elsevier BV",
number = "1-2",

}

TY - JOUR

T1 - Microstructural evolution in high purity aluminum processed by ECAP

AU - Kawasaki, Megumi

AU - Horita, Zenji

AU - Langdon, Terence G.

PY - 2009/10/25

Y1 - 2009/10/25

N2 - High purity (99.99%) aluminum was processed by equal-channel angular pressing (ECAP) through 1-12 passes and examined using orientation imaging microscopy. The results reveal two distinct processing regimes: from 1 to 4 passes the microstructure evolves from elongated subgrains to an essentially equiaxed array of ultrafine grains and from 4 to 12 passes there is no measurable change in the average grain size and grain aspect ratio. The boundary misorientation angle and the fraction of high-angle boundaries increase rapidly up to 4 passes and at a slower rate from 4 to 12 passes. Anomalously large grains were visible in the central region of the billet pressed through 12 passes due to dynamic recovery and grain growth. The results suggest optimum processing is achieved by pressing through 4-8 passes.

AB - High purity (99.99%) aluminum was processed by equal-channel angular pressing (ECAP) through 1-12 passes and examined using orientation imaging microscopy. The results reveal two distinct processing regimes: from 1 to 4 passes the microstructure evolves from elongated subgrains to an essentially equiaxed array of ultrafine grains and from 4 to 12 passes there is no measurable change in the average grain size and grain aspect ratio. The boundary misorientation angle and the fraction of high-angle boundaries increase rapidly up to 4 passes and at a slower rate from 4 to 12 passes. Anomalously large grains were visible in the central region of the billet pressed through 12 passes due to dynamic recovery and grain growth. The results suggest optimum processing is achieved by pressing through 4-8 passes.

UR - http://www.scopus.com/inward/record.url?scp=69249104520&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=69249104520&partnerID=8YFLogxK

U2 - 10.1016/j.msea.2009.06.032

DO - 10.1016/j.msea.2009.06.032

M3 - Article

AN - SCOPUS:69249104520

VL - 524

SP - 143

EP - 150

JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

SN - 0921-5093

IS - 1-2

ER -