Microstructural evolution in high purity aluminum processed by ECAP

Megumi Kawasaki; Zenji Horita; Terence G. Langdon

doi:10.1016/j.msea.2009.06.032

Microstructural evolution in high purity aluminum processed by ECAP

Megumi Kawasaki, Zenji Horita, Terence G. Langdon

Research output: Contribution to journal › Article › peer-review

219 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 language	English
Pages (from-to)	143-150
Number of pages	8
Journal	Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume	524
Issue number	1-2
DOIs	https://doi.org/10.1016/j.msea.2009.06.032
Publication status	Published - Oct 25 2009

All Science Journal Classification (ASJC) codes

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

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10.1016/j.msea.2009.06.032

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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.",

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T1 - Microstructural evolution in high purity aluminum processed by ECAP

AU - Kawasaki, Megumi

AU - Horita, Zenji

AU - Langdon, Terence G.

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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.

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Microstructural evolution in high purity aluminum processed by ECAP

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