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Mechanisms for suppressing discontinuous precipitation and improving mechanical properties of NiAl-strengthened steels through nanoscale Cu partitioning
Zhou, B. C.1; Yang, T.2; Zhou, G.3; Wang, H.3; Luan, J. H.2; Jiao, Z. B.1,4
Corresponding AuthorJiao, Z. B.(zb.jiao@polyu.edu.hk)
2021-02-15
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume205Pages:11
AbstractControl of discontinuous and continuous precipitation is crucial for tailoring the microstructure and mechanical properties of NiAl-strengthened steels. Through a combination of atom probe tomography, transmission electron microscopy, electron backscatter diffraction, first-principles calculations, and mechanical tests, we demonstrate that Cu is effective in not only promoting the nano-scale continuous NiAl precipitation but also in suppressing the coarse-scale discontinuous NiAl precipitation at grain boundaries, which results in the development of new NiAl-strengthened steels with a high yield strength (1400 MPa) and good ductility (10%). Our analyses indicate that the mechanisms for suppressing discontinuous NiAl precipitation are twofold. The main one is the acceleration of continuous NiAl precipitation through Cu partitioning, which swiftly reduces the matrix supersaturation, thereby decreasing the chemical driving force for the growth of discontinuous precipitates. The other is the reduction of grain boundary energy through Cu segregation, which is likely to decrease the nucleation rate of discontinuous precipitates. Consequently, Cu increases the number density of continuous NiAl nanoparticles by more than fivefold, which leads to a twofold enhancement in the strengthening and an improvement in the over-aging resistance of NiAl-strengthened steels. The effects of Cu on the precipitation strengthening mechanisms were quantitatively evaluated. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Keywordlow-carbon steel discontinuous precipitation precipitate precipitation hardening microstructure formation mechanism
Funding OrganizationResearch Grants Council of Hong Kong ; National Natural Science Foundation of China ; USTB-State Key Laboratory for Advanced Metals and Materials open fund ; Guangzhou International Science & Technology Cooperation Program ; PolyU-Chinese National Engineering Research Center for Steel Construction under ITF fund
DOI10.1016/j.actamat.2020.116561
Indexed BySCI
Language英语
Funding ProjectResearch Grants Council of Hong Kong[25202719] ; National Natural Science Foundation of China[51801169] ; USTB-State Key Laboratory for Advanced Metals and Materials open fund[2017-ZD01] ; Guangzhou International Science & Technology Cooperation Program[201907010026] ; PolyU-Chinese National Engineering Research Center for Steel Construction under ITF fund[P0013862]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000609936600031
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/159097
Collection中国科学院金属研究所
Corresponding AuthorJiao, Z. B.
Affiliation1.Hong Kong Polytech Univ, Dept Mech Engn, Hong Kong, Peoples R China
2.City Univ Hong Kong, Dept Mat Sci & Engn, Hong Kong, Peoples R China
3.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China
4.Hong Kong Polytech Univ, Shenzhen Res Inst, Shenzhen 518057, Peoples R China
Recommended Citation
GB/T 7714
Zhou, B. C.,Yang, T.,Zhou, G.,et al. Mechanisms for suppressing discontinuous precipitation and improving mechanical properties of NiAl-strengthened steels through nanoscale Cu partitioning[J]. ACTA MATERIALIA,2021,205:11.
APA Zhou, B. C.,Yang, T.,Zhou, G.,Wang, H.,Luan, J. H.,&Jiao, Z. B..(2021).Mechanisms for suppressing discontinuous precipitation and improving mechanical properties of NiAl-strengthened steels through nanoscale Cu partitioning.ACTA MATERIALIA,205,11.
MLA Zhou, B. C.,et al."Mechanisms for suppressing discontinuous precipitation and improving mechanical properties of NiAl-strengthened steels through nanoscale Cu partitioning".ACTA MATERIALIA 205(2021):11.
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