TY - JOUR
T1 - Suppression of Hydrogen Embrittlement due to Local Partitioning of Hydrogen to Dispersed Intermetallic Compound Particles in Al-Zn-Mg-Cu Alloys
AU - Fujihara, Hiro
AU - Shimizu, Kazuyuki
AU - Toda, Hiroyuki
AU - Takeuchi, Akihisa
AU - Uesugi, Masayuki
N1 - Funding Information:
This study was supported by the Japan Science and Technology Agency (JST) CREST Grant Number JPMJCR1995, Japan and JST under Collaborative Research Based on Industrial Demand, “Heterogeneous Structure Control: Toward Innovative Development of Metallic Structural Materials”, Grant Number JPMJSK1412, Japan. The synchrotron radiation experiments were performed at the BL20XU at SPring-8, with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2019A0076, 2020A1531). The study was also partially supported by JSPS KAKENHI Grant Number JP20J11740 and 21K14037. The authors would also like to thank Mr. Masashi Ikemi for his contribution to the experimental parts.
Publisher Copyright:
© 2022 The Japan Institute of Light Metals.
PY - 2022
Y1 - 2022
N2 - Recent studies have revealed that hydrogen embrittlement in Al-Zn-Mg alloys appears to be dominated by hydrogen partitioning to MgZn2 precipitates. A method has recently been proposed for reducing the hydrogen concentration at MgZn2 precipitates by adding specific intermetallic compound particles that have high hydrogen trap energy. In the present study, the effectiveness of Al7Cu2Fe particles on suppression of hydrogen embrittlement in Al-Zn-Mg-Cu alloys was evaluated using X-ray microtomography. Quasi-cleavage cracks were found to be initiated in regions where local volume fractions of the Al7Cu2Fe particles were relatively low. Hydrogen partitioning to the MgZn2 precipitate interface was suppressed, even in high hydrogen concentration material, by adding Al7Cu2Fe particles. However, the fractional area of the quasi-cleavage fracture in the material with high hydrogen concentration was higher due to insufficient hydrogen diffusion inside the Al7Cu2Fe particles and at the interface between the aluminum matrix and the particles. It appears that finely distributed small Al7Cu2Fe particles might effectively suppress hydrogen embrittlement.
AB - Recent studies have revealed that hydrogen embrittlement in Al-Zn-Mg alloys appears to be dominated by hydrogen partitioning to MgZn2 precipitates. A method has recently been proposed for reducing the hydrogen concentration at MgZn2 precipitates by adding specific intermetallic compound particles that have high hydrogen trap energy. In the present study, the effectiveness of Al7Cu2Fe particles on suppression of hydrogen embrittlement in Al-Zn-Mg-Cu alloys was evaluated using X-ray microtomography. Quasi-cleavage cracks were found to be initiated in regions where local volume fractions of the Al7Cu2Fe particles were relatively low. Hydrogen partitioning to the MgZn2 precipitate interface was suppressed, even in high hydrogen concentration material, by adding Al7Cu2Fe particles. However, the fractional area of the quasi-cleavage fracture in the material with high hydrogen concentration was higher due to insufficient hydrogen diffusion inside the Al7Cu2Fe particles and at the interface between the aluminum matrix and the particles. It appears that finely distributed small Al7Cu2Fe particles might effectively suppress hydrogen embrittlement.
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U2 - 10.2320/matertrans.MT-L2022007
DO - 10.2320/matertrans.MT-L2022007
M3 - Article
AN - SCOPUS:85139487382
VL - 63
SP - 1406
EP - 1415
JO - Materials Transactions
JF - Materials Transactions
SN - 0916-1821
IS - 10
ER -