Combined microtomography, thermal desorption spectroscopy, X-ray diffraction study of hydrogen trapping behavior in 7XXX aluminum alloys

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:655

Article

Bhuiyan, Md. Shahnewaz¹  Toda, Hiroyuki¹  Peng, Zhang¹  Hang, Su¹  Horikawa, Keitaro²  Uesugi, Kentaro³  Takeuchi, Akihisa³  Sakaguchi, Nobuto⁴  Watanabe, Yoshio⁴ 

[1] Kyushu Univ, Dept Mech Engn, Fukuoka 812, Japan

[2] Osaka Univ, Dept Mech Sci & Bioengn, Suita, Osaka 565, Japan

[3] Japan Synchrotron Radiat Inst JASRI, Tokyo, Japan

[4] UACJ Corp, Tokyo, Japan

关键词: Thermal desorption spectroscopy;    Microtomography;    XRD;    Hydrogen trapping;    Hydrogen embrittlement;    Aluminum alloys;   

DOI  :  10.1016/j.msea.2015.12.092

来源: Elsevier

【 摘 要 】

In the present study, combined thermal desorption spectroscopy (TDS), microtomography and X-ray diffraction study has been carried out to identify the hydrogen trap sites in 7XXX aluminum alloys. Through constant heating rate TDS experiments, three distinct trap states have been identified. It is revealed that micropores are the predominant hydrogen trap site in alloys with medium hydrogen content, whereas grain boundaries is the major hydrogen trap site in alloys with low and high hydrogen content. We have clarified that the rate of trap site occupancy in grain boundaries is high compared to dislocations and vacancies. Such high hydrogen coverage at grain boundaries indicates that the hydrogen-assisted fracture would be intergranular. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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