Hydrogen embrittlement properties of 7075 and 6061 aluminum alloys in humid air

• OSAKI Shuhei

  Graduate School of Science and Engineerig, Yamaguchi University

• IKEDA Jun

  Graduate student, Yamaguchi University

• KINOSHITA Katsuyuki

  Graduate School of Science and Engineerig, Yamaguchi University

• SASAKI Yuzo

  Japan Aluminum Association

Bibliographic Information

Other Title

• 湿潤空気中における７０７５および６０６１アルミニウム合金の水素脆化特性
• シツジュン クウキ チュウ ニ オケル 7075 オヨビ 6061 アルミニウム ゴウキン ノ スイソ ゼイカ トクセイ

Abstract

For 6061-T6 and 7075-T6 aluminum alloys as candidate liner materials for high-pressure hydrogen container, SSRT (slow strain-rate technique) tests in humid air with 90% relative humidity were carried out to evaluate the susceptibility to hydrogen embrittlement (HE) and to reveal the process of HEAC (hydrogen-environment -assisted cracking). 7075-T6 showed a significant susceptibility to HE, resulting in intergranular cracking, while in contrast, 6061-T6 exhibited an excellent resistance required as liner materials. HEAC of 7075-T6 is confirmed to progress as follows; at the first stage micro-cracks originate at inclusions of Al–Fe–(Cu) phase on the specimen surface and then advance to intergranular cracking. 6061-T6 would not give rise to micro-cracks because of less localization of slip deformation enhanced by hydrogen effects, mainly due to the precipitation microstructure.

Journal

• Journal of Japan Institute of Light Metals

  Journal of Japan Institute of Light Metals 56 (12), 721-727, 2006

  The Japan Institute of Light Metals

Keywords

• hydrogen embrittlement
• 6061
• 7075
• SSRT test
• humid air

Details

• CRID: 1390282681315352064
• NII Article ID: 10018660937
• NII Book ID: AN00069773
• DOI: 10.2464/jilm.56.721
• COI: 1:CAS:528:DC%2BD2sXhvVWltLg%3D
• ISSN: 18808018
• ISSN: 04515994
• NDL BIB ID: 8623525
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8623525
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed