Low-temperature anatase-to-rutile phase transformation and unusual grain coarsening in titanium oxide nanopowders by high-pressure torsion straining

Kaveh Edalati; Qing Wang; Hadi Razavi-Khosroshahi; Hoda Emami; Masayoshi Fuji; Zenji Horita

doi:10.1016/j.scriptamat.2018.11.044

Low-temperature anatase-to-rutile phase transformation and unusual grain coarsening in titanium oxide nanopowders by high-pressure torsion straining

Kaveh Edalati, Qing Wang, Hadi Razavi-Khosroshahi, Hoda Emami, Masayoshi Fuji, Zenji Horita

Materials Physics and Engineering

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

21 Citations (Scopus)

Abstract

Simultaneous effect of pressure, temperature and plastic strain on structural evolution of titania ceramic nanopowder was investigated using the high-pressure torsion (HPT) method. Unlike static annealing, in which the anatase-to-rutile phase transformation occurred at 1173 K, the transformation was observed at low temperatures as 473–573 K by HPT processing. The formation of rutile phase accompanied with dynamic recrystallization and an unusual grain growth, indicating that severe plastic deformation at low homologous temperatures does not necessarily result in grain refinement of metastable nanoceramics. Besides the coarsened grains of rutile phase, a high-pressure TiO₂-II columbite phase was also detected in small nanograins.

Original language	English
Pages (from-to)	341-344
Number of pages	4
Journal	Scripta Materialia
Volume	162
DOIs	https://doi.org/10.1016/j.scriptamat.2018.11.044
Publication status	Published - Mar 15 2019

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.2018.11.044

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title = "Low-temperature anatase-to-rutile phase transformation and unusual grain coarsening in titanium oxide nanopowders by high-pressure torsion straining",

abstract = "Simultaneous effect of pressure, temperature and plastic strain on structural evolution of titania ceramic nanopowder was investigated using the high-pressure torsion (HPT) method. Unlike static annealing, in which the anatase-to-rutile phase transformation occurred at 1173 K, the transformation was observed at low temperatures as 473–573 K by HPT processing. The formation of rutile phase accompanied with dynamic recrystallization and an unusual grain growth, indicating that severe plastic deformation at low homologous temperatures does not necessarily result in grain refinement of metastable nanoceramics. Besides the coarsened grains of rutile phase, a high-pressure TiO2-II columbite phase was also detected in small nanograins.",

author = "Kaveh Edalati and Qing Wang and Hadi Razavi-Khosroshahi and Hoda Emami and Masayoshi Fuji and Zenji Horita",

note = "Funding Information: The authors thank Grants-in-Aid for Scientific Research from the MEXT, Japan (16H04539, 26220909). The HPT processing was conducted at IRC-GSAM, Kyushu University, Japan. Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

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doi = "10.1016/j.scriptamat.2018.11.044",

language = "English",

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T1 - Low-temperature anatase-to-rutile phase transformation and unusual grain coarsening in titanium oxide nanopowders by high-pressure torsion straining

AU - Edalati, Kaveh

AU - Wang, Qing

AU - Razavi-Khosroshahi, Hadi

AU - Emami, Hoda

AU - Fuji, Masayoshi

AU - Horita, Zenji

N1 - Funding Information: The authors thank Grants-in-Aid for Scientific Research from the MEXT, Japan (16H04539, 26220909). The HPT processing was conducted at IRC-GSAM, Kyushu University, Japan. Publisher Copyright: © 2018 Elsevier Ltd

PY - 2019/3/15

Y1 - 2019/3/15

N2 - Simultaneous effect of pressure, temperature and plastic strain on structural evolution of titania ceramic nanopowder was investigated using the high-pressure torsion (HPT) method. Unlike static annealing, in which the anatase-to-rutile phase transformation occurred at 1173 K, the transformation was observed at low temperatures as 473–573 K by HPT processing. The formation of rutile phase accompanied with dynamic recrystallization and an unusual grain growth, indicating that severe plastic deformation at low homologous temperatures does not necessarily result in grain refinement of metastable nanoceramics. Besides the coarsened grains of rutile phase, a high-pressure TiO2-II columbite phase was also detected in small nanograins.

AB - Simultaneous effect of pressure, temperature and plastic strain on structural evolution of titania ceramic nanopowder was investigated using the high-pressure torsion (HPT) method. Unlike static annealing, in which the anatase-to-rutile phase transformation occurred at 1173 K, the transformation was observed at low temperatures as 473–573 K by HPT processing. The formation of rutile phase accompanied with dynamic recrystallization and an unusual grain growth, indicating that severe plastic deformation at low homologous temperatures does not necessarily result in grain refinement of metastable nanoceramics. Besides the coarsened grains of rutile phase, a high-pressure TiO2-II columbite phase was also detected in small nanograins.

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JO - Scripta Materialia

JF - Scripta Materialia

ER -

Low-temperature anatase-to-rutile phase transformation and unusual grain coarsening in titanium oxide nanopowders by high-pressure torsion straining

Abstract

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