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Grain boundary energy effect on grain boundary segregation in an equiatomic high-entropy alloy
Li, Linlin1,2; Kamachali, Reza Darvishi1,3; Li, Zhiming1,4; Zhang, Zhefeng2
Corresponding AuthorLi, Linlin(l.li@mpie.de)
2020-05-29
Source PublicationPHYSICAL REVIEW MATERIALS
ISSN2475-9953
Volume4Issue:5Pages:11
AbstractGrain boundary (GB) segregation has a substantial effect on the microstructure evolution and properties of polycrystalline alloys. The mechanism of nanoscale segregation at the various GBs in multicomponent alloys is of great challenge to reveal and remains elusive so far. To address this issue, we studied the GB segregation in a representative equiatomic FeMnNiCoCr high-entropy alloy (HEA) aged at 450 degrees C. By combining transmission Kikuchi diffraction, atom probe tomography analysis and a density-based thermodynamics modeling, we uncover the nanoscale segregation behavior at a series of well-characterized GBs of different characters. No segregation occurs at coherent twin boundaries; only slight nanoscale segregation of Ni takes place at the low-angle GBs and vicinal Sigma 29b coincidence site lattice GBs. Ni and Mn show cosegregation of high levels at the general high-angle GBs with a strong depletion in Fe, Cr, and Co. Our density-based thermodynamic model reveals that the highly negative energy of mixing Ni and Mn is the main driving force for nanoscale cosegregation to the GBs. This is further assisted by the opposite segregation of Ni and Cr atoms with a positive enthalpy of mixing. It is also found that GBs of higher interfacial energy, possessing lower atomic densities (higher disorder and free volume), show higher segregation levels. By clarifying the origins of GB segregations in the FeMnNiCoCr HEA, the current work provides fundamental ideas on nanoscale segregation at crystal defects in multicomponent alloys.
Funding OrganizationAlexander von Humboldt Stiftung ; German Research Foundation (DFG) within the Heisenberg programme
DOI10.1103/PhysRevMaterials.4.053603
Indexed BySCI
Language英语
Funding ProjectAlexander von Humboldt Stiftung ; German Research Foundation (DFG) within the Heisenberg programme[DA 1655/2-1]
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Multidisciplinary
WOS IDWOS:000536405700002
PublisherAMER PHYSICAL SOC
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/138997
Collection中国科学院金属研究所
Corresponding AuthorLi, Linlin
Affiliation1.Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany
2.Chinese Acad Sci, Inst Met Res, Wenhua Rd 72, Shenyang 110016, Peoples R China
3.BAM Fed Inst Mat Res & Testing, Unter Eichen 87, D-12205 Berlin, Germany
4.Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China
Recommended Citation
GB/T 7714
Li, Linlin,Kamachali, Reza Darvishi,Li, Zhiming,et al. Grain boundary energy effect on grain boundary segregation in an equiatomic high-entropy alloy[J]. PHYSICAL REVIEW MATERIALS,2020,4(5):11.
APA Li, Linlin,Kamachali, Reza Darvishi,Li, Zhiming,&Zhang, Zhefeng.(2020).Grain boundary energy effect on grain boundary segregation in an equiatomic high-entropy alloy.PHYSICAL REVIEW MATERIALS,4(5),11.
MLA Li, Linlin,et al."Grain boundary energy effect on grain boundary segregation in an equiatomic high-entropy alloy".PHYSICAL REVIEW MATERIALS 4.5(2020):11.
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