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MECHANISM OF B IN HYDROGEN-RESISTANCE J75 ALLOY
Liang Hao1; Zhao Mingjiu2; Chen Shenghu2; Xu Yong1; Wang Yongli2; Rong Lijian2
Corresponding AuthorZhao Mingjiu(mjzhao@imr.ac.cn)
2015-12-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume51Issue:12Pages:1538-1544
AbstractWith the development of hydrogen economy, the demand of structural materials with high strength suitable for service in hydrogen or hydrogen-bearing environments such as storage of hydrogen gas was incremental. An optional structural materials is J75 alloy, which is mainly strengthened by an ordered fcc gamma' phase, Ni-3(Al, Ti), coherent with the austenite matrix. Investigation on J75 alloy indicated that the commercial alloy free of B would lose about half its ductility when charged with hydrogen, accompanied by a change of fracture mode from ductile rupture to brittle-appearing intergranular fracture. Otherwise, an improvement in ductility and hydrogen resistant performance was observed in the J75 alloy with trace B, however, its role in the alloy is unclear. So, in present work, mechanism of B in the J75 hydrogen-resistant alloy was investigated by means of OM, SEM, TEM, EPMA, 3DAP, SIMS, hydrogen penetration, thermal hydrogen charging experiments and tensile tests. It was found that a lot of Ti segregated at grain boundaries (GBs) in the alloy free of B, resulted in abundant precipitation of cellular eta phases. However, the cellular eta phase was not observed in the alloy with B, and it could be attributed to the segregation of B atoms at GBs and inhibited the segregation of Ti. A lower hydrogen diffusion coefficient was observed in the alloy with B than that in the alloy free of B by hydrogen permeation, indicating that diffusion velocity of H atoms in the alloy had been decreased by the addition of B. Moreover, segregation of B at GBs could not only inhibit the precipitation of eta phases but also decrease the number of H atoms there, which would improve the hydrogen-resistant performance of the alloy.
KeywordJ75 alloy B hydrogen-resistant performance eta phase
Funding OrganizationNational Natural Science Foundation of China and China Academy of Engineering Physics ; National Natural Science Foundation of China
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China and China Academy of Engineering Physics[U1230118] ; National Natural Science Foundation of China[51171178]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000367770600015
PublisherSCIENCE PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/121498
Collection中国科学院金属研究所
Corresponding AuthorZhao Mingjiu
Affiliation1.China Acad Engn Phys, Inst Syst Engn, Mianyang 621900, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Liang Hao,Zhao Mingjiu,Chen Shenghu,et al. MECHANISM OF B IN HYDROGEN-RESISTANCE J75 ALLOY[J]. ACTA METALLURGICA SINICA,2015,51(12):1538-1544.
APA Liang Hao,Zhao Mingjiu,Chen Shenghu,Xu Yong,Wang Yongli,&Rong Lijian.(2015).MECHANISM OF B IN HYDROGEN-RESISTANCE J75 ALLOY.ACTA METALLURGICA SINICA,51(12),1538-1544.
MLA Liang Hao,et al."MECHANISM OF B IN HYDROGEN-RESISTANCE J75 ALLOY".ACTA METALLURGICA SINICA 51.12(2015):1538-1544.
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