TY - JOUR
T1 - Assessment of hydrogen embrittlement via image-based techniques in Al–Zn–Mg–Cu aluminum alloys
AU - Su, Hang
AU - Toda, Hiroyuki
AU - Shimizu, Kazuyuki
AU - Uesugi, Kentaro
AU - Takeuchi, Akihisa
AU - Watanabe, Yoshio
N1 - Funding Information:
The authors gratefully acknowledge the support from the New Energy and Industrial Technology Development Organization (part of the Technological Development of Innovative New Structural Materials, Project HAJJ262715 ) and the Industry-Academia Collaborative R&D Program “Heterogeneous Structure Control” from the Japan Science and Technology Agency, JST ( JPMJSK1412 ). The synchrotron radiation experiments were performed through proposal No. 2016A1199 and 2016B1081 with the approval of JASRI.
Funding Information:
The authors gratefully acknowledge the support from the New Energy and Industrial Technology Development Organization (part of the Technological Development of Innovative New Structural Materials, Project HAJJ262715) and the Industry-Academia Collaborative R&D Program “Heterogeneous Structure Control” from the Japan Science and Technology Agency, JST (JPMJSK1412). The synchrotron radiation experiments were performed through proposal No. 2016A1199 and 2016B1081 with the approval of JASRI.
Publisher Copyright:
© 2019 Acta Materialia Inc.
PY - 2019/9/1
Y1 - 2019/9/1
N2 - Hydrogen repartitioning and the related embrittlement behavior were characterized by studying Al–Zn–Mg–Cu aluminum alloys with different intermetallic particle contents. Using high-resolution X-ray tomography and related microstructural tracking techniques, hydrogen-induced quasi-cleavage cracks and the related strain localization were observed regardless of the content of the intermetallic particles. The area of quasi-cleavage cracks on the fracture surface increased and the strain localization became more intense with a decrease in the content of intermetallic particles, thereby revealing that trapped hydrogen at intermetallic particles increases the resistance to hydrogen embrittlement. In addition, a quantitative assessment of the hydrogen repartitioning taking into account vacancy production and dislocation multiplication during deformation, was applied to characterize the hydrogen embrittlement behavior. Because of the thermal equilibrium among various hydrogen trap sites, internal hydrogen atoms are mainly repartitioned to vacancies and precipitates in the strain localization region during deformation because of their high trap site densities and high hydrogen trap binding energies. Since the concentration of hydrogen trapped at dislocations is extremely limited, it can be assumed that hydrogen repartitioned to precipitates induces decohesion of precipitates along specific crystallographic planes, where quasi-cleavage cracking may originate.
AB - Hydrogen repartitioning and the related embrittlement behavior were characterized by studying Al–Zn–Mg–Cu aluminum alloys with different intermetallic particle contents. Using high-resolution X-ray tomography and related microstructural tracking techniques, hydrogen-induced quasi-cleavage cracks and the related strain localization were observed regardless of the content of the intermetallic particles. The area of quasi-cleavage cracks on the fracture surface increased and the strain localization became more intense with a decrease in the content of intermetallic particles, thereby revealing that trapped hydrogen at intermetallic particles increases the resistance to hydrogen embrittlement. In addition, a quantitative assessment of the hydrogen repartitioning taking into account vacancy production and dislocation multiplication during deformation, was applied to characterize the hydrogen embrittlement behavior. Because of the thermal equilibrium among various hydrogen trap sites, internal hydrogen atoms are mainly repartitioned to vacancies and precipitates in the strain localization region during deformation because of their high trap site densities and high hydrogen trap binding energies. Since the concentration of hydrogen trapped at dislocations is extremely limited, it can be assumed that hydrogen repartitioned to precipitates induces decohesion of precipitates along specific crystallographic planes, where quasi-cleavage cracking may originate.
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U2 - 10.1016/j.actamat.2019.06.056
DO - 10.1016/j.actamat.2019.06.056
M3 - Article
AN - SCOPUS:85068458950
SN - 1359-6454
VL - 176
SP - 96
EP - 108
JO - Acta Materialia
JF - Acta Materialia
ER -