Grain growth in nanograined aluminum oxide by high-pressure torsion: Phase transformation and plastic strain effects

Ikuro Fujita; Kaveh Edalati; Xavier Sauvage; Zenji Horita

doi:10.1016/j.scriptamat.2018.04.003

Grain growth in nanograined aluminum oxide by high-pressure torsion: Phase transformation and plastic strain effects

Ikuro Fujita, Kaveh Edalati, Xavier Sauvage, Zenji Horita

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

18 Citations (Scopus)

Abstract

Application of severe plastic deformation (SPD) to different materials usually leads to significant grain refinement and accelerated phase transformations. This study reports the occurrence of grain growth in nanocrystalline Al₂O₃ by SPD processing via high-pressure torsion (HPT) due to a phase transformation from γ with the cubic structure to α with the rhombohedral structure. This transformation was significantly enhanced by pressure and plastic strain and occurred at ~650 K below the γ → α transition temperature. The γ phase after HPT processing could be detected only in nanograins or in the nano-sized laths with the (13¯1)γ//(014¯)α and [001]γ//[100]α coherent orientation relationship.

Original language	English
Pages (from-to)	11-14
Number of pages	4
Journal	Scripta Materialia
Volume	152
DOIs	https://doi.org/10.1016/j.scriptamat.2018.04.003
Publication status	Published - Jul 15 2018

All Science Journal Classification (ASJC) codes

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

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10.1016/j.scriptamat.2018.04.003

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title = "Grain growth in nanograined aluminum oxide by high-pressure torsion: Phase transformation and plastic strain effects",

abstract = "Application of severe plastic deformation (SPD) to different materials usually leads to significant grain refinement and accelerated phase transformations. This study reports the occurrence of grain growth in nanocrystalline Al2O3 by SPD processing via high-pressure torsion (HPT) due to a phase transformation from γ with the cubic structure to α with the rhombohedral structure. This transformation was significantly enhanced by pressure and plastic strain and occurred at ~650 K below the γ → α transition temperature. The γ phase after HPT processing could be detected only in nanograins or in the nano-sized laths with the (13¯1)γ//(014¯)α and [001]γ//[100]α coherent orientation relationship.",

author = "Ikuro Fujita and Kaveh Edalati and Xavier Sauvage and Zenji Horita",

note = "Funding Information: This study was supported in part by WPI-I2CNER and in part by the MEXT, Japan (Grants 16H04539 and 26220909 ). The HPT process was performed in IRC-GSAM at Kyushu University. TEM experiments were carried out on a GENESIS facility, supported by the R{\'e}gion Normandie, France, and by the French National Research Agency (ANR-11-EQPX-0020). Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

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doi = "10.1016/j.scriptamat.2018.04.003",

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T1 - Grain growth in nanograined aluminum oxide by high-pressure torsion

T2 - Phase transformation and plastic strain effects

AU - Fujita, Ikuro

AU - Edalati, Kaveh

AU - Sauvage, Xavier

AU - Horita, Zenji

N1 - Funding Information: This study was supported in part by WPI-I2CNER and in part by the MEXT, Japan (Grants 16H04539 and 26220909 ). The HPT process was performed in IRC-GSAM at Kyushu University. TEM experiments were carried out on a GENESIS facility, supported by the Région Normandie, France, and by the French National Research Agency (ANR-11-EQPX-0020). Publisher Copyright: © 2018 Elsevier Ltd

PY - 2018/7/15

Y1 - 2018/7/15

N2 - Application of severe plastic deformation (SPD) to different materials usually leads to significant grain refinement and accelerated phase transformations. This study reports the occurrence of grain growth in nanocrystalline Al2O3 by SPD processing via high-pressure torsion (HPT) due to a phase transformation from γ with the cubic structure to α with the rhombohedral structure. This transformation was significantly enhanced by pressure and plastic strain and occurred at ~650 K below the γ → α transition temperature. The γ phase after HPT processing could be detected only in nanograins or in the nano-sized laths with the (13¯1)γ//(014¯)α and [001]γ//[100]α coherent orientation relationship.

AB - Application of severe plastic deformation (SPD) to different materials usually leads to significant grain refinement and accelerated phase transformations. This study reports the occurrence of grain growth in nanocrystalline Al2O3 by SPD processing via high-pressure torsion (HPT) due to a phase transformation from γ with the cubic structure to α with the rhombohedral structure. This transformation was significantly enhanced by pressure and plastic strain and occurred at ~650 K below the γ → α transition temperature. The γ phase after HPT processing could be detected only in nanograins or in the nano-sized laths with the (13¯1)γ//(014¯)α and [001]γ//[100]α coherent orientation relationship.

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JO - Scripta Materialia

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Grain growth in nanograined aluminum oxide by high-pressure torsion: Phase transformation and plastic strain effects

Abstract

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