Anisotropy of interfacial segregation: grain boundaries and free surfaces

Lejček, Pavel; Krajnikov, A.V.; Ivashchenko, Yu. N.; Adámek, J.

doi:10.1016/0039-6028(92)91407-3

Cited by 12 publications

(5 citation statements)

References 11 publications

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“…Perhaps it depends on the interface microstructure, as does solute segregation for grain boundary structures. [71][72][73] Similar results were also obtained for Fe 3 Al type alloys. 16 With sulfur being clearly concentrated at the scale/alloy interface, especially so for MCrAl type alloys, the question that follows is whether this interfacial sulfur will be incorporated into the oxide as the scale grows inward.…”

Section: (2) Sulfursupporting

confidence: 71%

“…The fact that sulfur did not start to segregate to the Al 2 O 3 /FeAl interface until the establishment of a complete layer of α-Al 2 O 3 indicates that the process of impurity segregation to growing oxide/metal interfaces is strongly related to scale development. Perhaps it depends on the interface microstructure, as does solute segregation for grain boundary structures [71][72][73] . Similar results were also obtained for Fe 3 Al type alloys 16 .…”

Section: Sulfurmentioning

confidence: 99%

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Impurity Effects on Alumina Scale Growth

Hou¹

2003

Journal of the American Ceramic Society

141

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Most high temperature resistant alloys oxidize to form an external alumina layer, or scale, whose slow growth protects the underlying alloy from continued aggressive oxidation. The growth of the Al 2 O 3 scale is controlled by the transport of oxygen inward and aluminum outward through it, with the rate dominated by the fastest diffusing specie down the fastest path. Components in the alloy can be incorporated into the growing Al 2 O 3 layer, hence affect the transport rates of oxygen and/or aluminum. This paper summarizes existing experimental data to assess the possible effect of these incorporated impurities on the growth rate and transport properties of Al 2 O 3 scales formed on Fe, Ni and Pt based alloys. The amount and distribution of the alloy base metal, sulfur impurity and reactive elements, such as Hf, Y, Zr and Ce, in the alumina scale are evaluated. Their effect on the oxidation and transport rates through the scale are discussed and compared with Al and O diffusion rates deduced from creep studies.

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Section: (2) Sulfursupporting

confidence: 71%

Section: Sulfurmentioning

confidence: 99%

Impurity Effects on Alumina Scale Growth

Hou¹

2003

Journal of the American Ceramic Society

141

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“…Annealing of the sputtered fracture surface from this boundary, i.e., now a (013) free surface, at the same temperature, however, leads to formation of stable SixNy 2-D surface compounds at this surface thus preventing segregation of other elements. In denitridized and decarburized samples, on the other hand, enrichment of phosphorus and depletion of silicon were found again at the grain boundary whereas pronounced sulfur segregation dominates at the free surface and is accompanied by a weaker phosphorus and silicon segregation [88,89]. Model calculation of the segregation behavior in an Fe-Si (P, S) alloy demonstrated that the differences in the behavior of both crystallographic interfaces are controlled by the free energy of segregation of individual components.…”

Section: Type Of the Interface: Grain Boundary Vs Surface Segregationmentioning

confidence: 99%

“…9). From the phenomenological point of view these qualitative differences may be considered as a generalized anisotropy ofinterfacial segregation [88,89].…”

Section: Type Of the Interface: Grain Boundary Vs Surface Segregationmentioning

confidence: 99%

Solute segregation at grain boundaries

Hofmann¹,

Leiĉek

1996

Interface Sci

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This feature article summarizes the present art and science of grain boundary segregation from the viewpoint of the authors activities in this field. In the part on equilibrium segregation, fundamental effects on grain boundary segregation are discussed such as the nature of the solute/matrix binary system, presence of additional elements, temperature, grain boundary orientation and type of interface. In addition, the predictive capabilities of grain boundary segregation diagrams are outlined. The present models of segregation kinetics are reviewed and discussed in connection with recent experiment. The last part of the paper is focussed on the most important c3nsequences of grain boundary segregation, i.e., grain boundary cohesion and fracture.

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“…In such multicomponent systems (with three or more components), interactions among different GB adsorbates can significantly affect GB complexion and transition behaviors via attractive or repulsive interactions between them, as well as site competition and induced structural transitions (e.g., disordering). For example, in Fe based alloys, interactions between Si-P [55], Si-C [56], Sn-C [57], and B-P [58] are repulsive, whereas the interactions between B-N [56], Fe-Sb [59], and Ti-P [60] are attractive. Investigating the effects of such interactions is not only scientifically interesting but also technically important.…”

Section: Introductionmentioning

confidence: 99%

Grain boundary complexions in multicomponent alloys: Challenges and opportunities

Zhou

Luo

2016

Current Opinion in Solid State and Materials Science

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Grain boundaries (GBs) can undergo first-order or continuous phase-like transitions, which are called complexion transitions. Such GB transitions can cause abrupt changes in transport and physical properties, thereby critically influencing sintering, grain growth, creep, embrittlement, electrical/thermal/ionic conductivity, and a broad range of other materials properties. Specifically, the presence of multiple dopants and impurities can significantly alter the GB complexion formation and transition. This article reviews and discusses several GB adsorption (segregation) and prewetting/premelting type complexion models in multicomponent alloys, in which the interactions among multiple adsorbates not only provide a route to control GB properties but also produce novel phenomena. Specifically, various ternary GB diagrams, including both GB adsorption complexion diagrams with well-defined transition lines calculated from a lattice model (without considering interfacial disordering) and GB  diagrams that predict useful trends for average general GBs to disorder at high temperatures and related sintering phenomena, are constructed to quantitatively describe the GB behaviors as functions of bulk compositions. Finally, we propose a new opportunity of utilizing "high-entropy GB complexions" to stabilize nanocrystalline alloys.

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Anisotropy of interfacial segregation: grain boundaries and free surfaces

Cited by 12 publications

References 11 publications

Impurity Effects on Alumina Scale Growth

Impurity Effects on Alumina Scale Growth

Solute segregation at grain boundaries

Grain boundary complexions in multicomponent alloys: Challenges and opportunities

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