Optimization of mechanical properties in aluminum alloys via hydrogen partitioning control

Hiroyuki Toda, Masatake Yamaguchi, Kenji Matsuda, Kazuyuki Shimizu, Kyosuke Hirayama, Hang Su, Hiro Fujihara, Kenichi Ebihara, Mitsuhiro Itakura, Tomohito Tsuru, Katsuhiko Nishimura, Norio Nunomura, Seungwon Lee, Taiki Tsuchiya, Akihisa Takeuchi, Kentaro Uesugi

研究成果: ジャーナルへの寄稿記事

抄録

Synopsis: This review reports the research activity on the hydrogen embrittlement in high-strength aluminum alloys, especially focusing on hydrogen trapping at various trap sites and its influence on hydrogen embrittlement. We have investigated the three representative hydrogen embrittlement mechanisms in high-zinc-concentration Al-Zn-Mg alloys. One of the three mechanisms is the damage evolution originated from hydrogen precipitated as pores. We have paid marked attention to the existence of age-hardening precipitates as the major hydrogen trap site. Firstly, we have clarified the nanoscopic structures of a few MgZn 2 precipitates and their interface by means of the high-resolution TEM technique. Such information has been utilized to perform a first principles simulation to know trap binding energy values for almost all the possible trap sites. At the same time, detailed fracture micromechanisms and microstructure-property relationships have been investigated by employing both the high resolution X-ray micro-tomography technique and the first principles simulation. The ultra-high-resolution X-ray microscope, which has been realized quite recently, has also been applied. Characteristic localized deformation and subsequent crack initiation and growth through deformed aluminum have been observed. It has also been revealed that hydrogen embrittlement has been suppressed when relatively coarse particles are dispersed. In-situ hydrogen repartitioning during deformation and fracture has been estimated by considering thermal equilibrium among the various trap sites together with the increase in trap site density during deformation. The relationship between the in-situ repartitioning of hydrogen and hydrogen embrittlement with the three different micromechanisms are discussed to explain realistic conditions for hydrogen embrittlement to occur.

元の言語英語
ページ(範囲)118-131
ページ数14
ジャーナルTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
105
発行部数2
DOI
出版物ステータス出版済み - 2 1 2019

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hydrogen embrittlement
Hydrogen embrittlement
aluminum alloys
Hydrogen
Aluminum alloys
traps
mechanical properties
Mechanical properties
optimization
hydrogen
Precipitates
precipitates
high resolution
X ray microscopes
high strength alloys
High strength alloys
precipitation hardening
Age hardening
crack initiation
Binding energy

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

これを引用

Optimization of mechanical properties in aluminum alloys via hydrogen partitioning control. / Toda, Hiroyuki; Yamaguchi, Masatake; Matsuda, Kenji; Shimizu, Kazuyuki; Hirayama, Kyosuke; Su, Hang; Fujihara, Hiro; Ebihara, Kenichi; Itakura, Mitsuhiro; Tsuru, Tomohito; Nishimura, Katsuhiko; Nunomura, Norio; Lee, Seungwon; Tsuchiya, Taiki; Takeuchi, Akihisa; Uesugi, Kentaro.

:: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan, 巻 105, 番号 2, 01.02.2019, p. 118-131.

研究成果: ジャーナルへの寄稿記事

Toda, H, Yamaguchi, M, Matsuda, K, Shimizu, K, Hirayama, K, Su, H, Fujihara, H, Ebihara, K, Itakura, M, Tsuru, T, Nishimura, K, Nunomura, N, Lee, S, Tsuchiya, T, Takeuchi, A & Uesugi, K 2019, 'Optimization of mechanical properties in aluminum alloys via hydrogen partitioning control', Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan, 巻. 105, 番号 2, pp. 118-131. https://doi.org/10.2355/tetsutohagane.TETSU-2018-083
Toda, Hiroyuki ; Yamaguchi, Masatake ; Matsuda, Kenji ; Shimizu, Kazuyuki ; Hirayama, Kyosuke ; Su, Hang ; Fujihara, Hiro ; Ebihara, Kenichi ; Itakura, Mitsuhiro ; Tsuru, Tomohito ; Nishimura, Katsuhiko ; Nunomura, Norio ; Lee, Seungwon ; Tsuchiya, Taiki ; Takeuchi, Akihisa ; Uesugi, Kentaro. / Optimization of mechanical properties in aluminum alloys via hydrogen partitioning control. :: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan. 2019 ; 巻 105, 番号 2. pp. 118-131.
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abstract = "Synopsis: This review reports the research activity on the hydrogen embrittlement in high-strength aluminum alloys, especially focusing on hydrogen trapping at various trap sites and its influence on hydrogen embrittlement. We have investigated the three representative hydrogen embrittlement mechanisms in high-zinc-concentration Al-Zn-Mg alloys. One of the three mechanisms is the damage evolution originated from hydrogen precipitated as pores. We have paid marked attention to the existence of age-hardening precipitates as the major hydrogen trap site. Firstly, we have clarified the nanoscopic structures of a few MgZn 2 precipitates and their interface by means of the high-resolution TEM technique. Such information has been utilized to perform a first principles simulation to know trap binding energy values for almost all the possible trap sites. At the same time, detailed fracture micromechanisms and microstructure-property relationships have been investigated by employing both the high resolution X-ray micro-tomography technique and the first principles simulation. The ultra-high-resolution X-ray microscope, which has been realized quite recently, has also been applied. Characteristic localized deformation and subsequent crack initiation and growth through deformed aluminum have been observed. It has also been revealed that hydrogen embrittlement has been suppressed when relatively coarse particles are dispersed. In-situ hydrogen repartitioning during deformation and fracture has been estimated by considering thermal equilibrium among the various trap sites together with the increase in trap site density during deformation. The relationship between the in-situ repartitioning of hydrogen and hydrogen embrittlement with the three different micromechanisms are discussed to explain realistic conditions for hydrogen embrittlement to occur.",
author = "Hiroyuki Toda and Masatake Yamaguchi and Kenji Matsuda and Kazuyuki Shimizu and Kyosuke Hirayama and Hang Su and Hiro Fujihara and Kenichi Ebihara and Mitsuhiro Itakura and Tomohito Tsuru and Katsuhiko Nishimura and Norio Nunomura and Seungwon Lee and Taiki Tsuchiya and Akihisa Takeuchi and Kentaro Uesugi",
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AU - Toda, Hiroyuki

AU - Yamaguchi, Masatake

AU - Matsuda, Kenji

AU - Shimizu, Kazuyuki

AU - Hirayama, Kyosuke

AU - Su, Hang

AU - Fujihara, Hiro

AU - Ebihara, Kenichi

AU - Itakura, Mitsuhiro

AU - Tsuru, Tomohito

AU - Nishimura, Katsuhiko

AU - Nunomura, Norio

AU - Lee, Seungwon

AU - Tsuchiya, Taiki

AU - Takeuchi, Akihisa

AU - Uesugi, Kentaro

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N2 - Synopsis: This review reports the research activity on the hydrogen embrittlement in high-strength aluminum alloys, especially focusing on hydrogen trapping at various trap sites and its influence on hydrogen embrittlement. We have investigated the three representative hydrogen embrittlement mechanisms in high-zinc-concentration Al-Zn-Mg alloys. One of the three mechanisms is the damage evolution originated from hydrogen precipitated as pores. We have paid marked attention to the existence of age-hardening precipitates as the major hydrogen trap site. Firstly, we have clarified the nanoscopic structures of a few MgZn 2 precipitates and their interface by means of the high-resolution TEM technique. Such information has been utilized to perform a first principles simulation to know trap binding energy values for almost all the possible trap sites. At the same time, detailed fracture micromechanisms and microstructure-property relationships have been investigated by employing both the high resolution X-ray micro-tomography technique and the first principles simulation. The ultra-high-resolution X-ray microscope, which has been realized quite recently, has also been applied. Characteristic localized deformation and subsequent crack initiation and growth through deformed aluminum have been observed. It has also been revealed that hydrogen embrittlement has been suppressed when relatively coarse particles are dispersed. In-situ hydrogen repartitioning during deformation and fracture has been estimated by considering thermal equilibrium among the various trap sites together with the increase in trap site density during deformation. The relationship between the in-situ repartitioning of hydrogen and hydrogen embrittlement with the three different micromechanisms are discussed to explain realistic conditions for hydrogen embrittlement to occur.

AB - Synopsis: This review reports the research activity on the hydrogen embrittlement in high-strength aluminum alloys, especially focusing on hydrogen trapping at various trap sites and its influence on hydrogen embrittlement. We have investigated the three representative hydrogen embrittlement mechanisms in high-zinc-concentration Al-Zn-Mg alloys. One of the three mechanisms is the damage evolution originated from hydrogen precipitated as pores. We have paid marked attention to the existence of age-hardening precipitates as the major hydrogen trap site. Firstly, we have clarified the nanoscopic structures of a few MgZn 2 precipitates and their interface by means of the high-resolution TEM technique. Such information has been utilized to perform a first principles simulation to know trap binding energy values for almost all the possible trap sites. At the same time, detailed fracture micromechanisms and microstructure-property relationships have been investigated by employing both the high resolution X-ray micro-tomography technique and the first principles simulation. The ultra-high-resolution X-ray microscope, which has been realized quite recently, has also been applied. Characteristic localized deformation and subsequent crack initiation and growth through deformed aluminum have been observed. It has also been revealed that hydrogen embrittlement has been suppressed when relatively coarse particles are dispersed. In-situ hydrogen repartitioning during deformation and fracture has been estimated by considering thermal equilibrium among the various trap sites together with the increase in trap site density during deformation. The relationship between the in-situ repartitioning of hydrogen and hydrogen embrittlement with the three different micromechanisms are discussed to explain realistic conditions for hydrogen embrittlement to occur.

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