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Strong resistance to hydrogen embrittlement of high-entropy alloy
Pu Z(蒲卓); Chen Y(陈艳); Dai LH(戴兰宏)
发表期刊MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
2018-10-24
卷号736页码:156-166
ISSN0921-5093
摘要

The resistance to hydrogen embrittlement (HE) of CrMnFeCoNi high-entropy alloy (HEA) at both room and cryogenic temperatures was examined through tensile experiments on specimens hydrogenated via cathodic electrochemical charging method. Two representative steels, i.e. 316L stainless steel (SS) and X80 pipeline steel (PS), were chosen for comparison due to their similar main constituent elements to CrMnFeCoNi HEA. Results show that the hydrogen pre-charged CrMnFeCoNi HEA has the smallest loss of ductility among the three materials at room temperature, while displays no reduction of elongation at 77 K, compared with the uncharged one. Fracture surfaces at both room and cryogenic temperatures of hydrogen pre-charged CrMnFeCoNi HEA are mainly composed of dimples, indicating ductile fractures, while brittle characteristics occur in pre-charged 316L SS and X80 PS. Typical deformation microstructure of the hydrogen pre-charged CrMnFeCoNi HEA at room temperature is tangled dislocations instead of highly dense dislocation walls (HDDWs) found in the pre-charged 316L SS. At 77 K, more deformation twins are formed in the both materials. Reasons for a higher resistance to HE of CrMnFeCoNi HEA at room temperature are attributed to the formation of less hydrogen trapping sites, thus a lower degree of hydrogen enrichment than 316L SS. While at 77 K, the atomic hydrogen is not able to promptly accumulate near these trapping sites due to its slow diffusion rate, which leads to strong HE resistance.

关键词High-entropy alloy Hydrogen embrittlement Cryogenic temperature Ductility Deformation microstructure
DOI10.1016/j.msea.2018.08.101
URL查看原文
收录类别SCI ; EI
语种英语
WOS记录号WOS:000447573400017
关键词[WOS]AUSTENITIC STAINLESS-STEELS ; INDUCED PLASTICITY STEEL ; X80 PIPELINE STEEL ; HIGH-STRENGTH ; TENSILE PROPERTIES ; FCC CRYSTALS ; IN-SITU ; METALS ; STRAIN ; SUSCEPTIBILITY
WOS研究方向Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS类目Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
项目资助者National Key Research and Development Program of China [2017YFB0702003] ; NSFC [11472287, 11790292, 11572324] ; Strategic Priority Research Program of the Chinese Academy of Sciences [XDB22040302, XDB22040303] ; Key Research Program of Frontier Sciences [QYZDJSSW-JSC011]
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力学所作者排名1
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文献类型期刊论文
条目标识符http://dspace.imech.ac.cn/handle/311007/78144
专题非线性力学国家重点实验室
作者单位1.[Pu, Z.
2.Chen, Y.
3.Dai, L. H.] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
4.Dai, L. H.] Univ Chinese Acad Sci, Sch Engn Sci, Beijing 101408, Peoples R China
5.[Dai, L. H.] Beijing Inst Technol, State Key Lab Explos Sci & Technol, Beijing 100081, Peoples R China
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GB/T 7714
Pu Z,Chen Y,Dai LH. Strong resistance to hydrogen embrittlement of high-entropy alloy[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2018,736:156-166.
APA Pu Z,Chen Y,&Dai LH.(2018).Strong resistance to hydrogen embrittlement of high-entropy alloy.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,736,156-166.
MLA Pu Z,et al."Strong resistance to hydrogen embrittlement of high-entropy alloy".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 736(2018):156-166.
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