<sup>59</sup>Fe TRACER SELF-DIFFUSION IN AMORPHOUS Fe-Ni-B ALLOYS

Horváth, J.; Pfahler, K.; Ulfert, W.; Frank, W.; Mehrer, H.

doi:10.1051/jphyscol:19858104

Cited by 8 publications

(4 citation statements)

References 2 publications

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“…This irreversible structural relaxation leads to a drop of the diffusivity until it approaches a time-independent value which represents a thermodynamic metastable equilibrium state [11,12]. Structural relaxation affects nearly all properties and may lead to severe embrittlement, for example [13].…”

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confidence: 99%

Isotope effect of Co diffusion in thin amorphous Co ₅₁ Zr ₄₉ layers during structural relaxation

et al. 2000

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The time dependence and the isotope effect E = (Dα/D β − 1)/( m β /mα − 1) of Co diffusion have been measured in amorphous Co51Zr49 during structural relaxation. The radiotracer technique in conjunction with serial sectioning using ion-beam sputtering was employed to observe diffusion on a nanometer scale. A drastic drop of diffusivity during structural relaxation in these thin films was found which is of the same order of magnitude observed in much thicker Co89Zr11 glasses (Dörner W. and Mehrer H., Phys. Rev. B, 44 (1991) 101). This seems to rule out annihilation of quenched-in free volume at the outer surface. In contrast to measurements in melt-spun amorphous Co76.7Fe2Nb14.3B7, where a change in E from E ≈ 0.5 in the as-quenched state to E ≈ 0.1 in the relaxed state has been measured (Rätzke K. et. al., Phys. Rev. Lett., 68 (1992) 2347), no change in E has been observed in Co51Zr49 during structural relaxation. The low value of E = 0.01(2) in the relaxed and even in the as-quenched state in the present alloy strongly suggests collective diffusion mechanisms in the relaxed and also as-quenched state.

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confidence: 99%

Isotope effect of Co diffusion in thin amorphous Co ₅₁ Zr ₄₉ layers during structural relaxation

et al. 2000

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“…1 to the experimental data. [21]. Each curve corresponds to a sample annealed for the annealing time indicated.…”

Section: Experimental Methods For Diffusion Studies On Glassy Metalsmentioning

confidence: 99%

“…Fig. 11 shows time-averaged diffusivities of 59 Fe diffusion in a rapidly quenched metallic glass Fe 40 Ni 40 B 20 according to Horvath et al [21] and time-averaged diffusivities in a Co-Zr glass according to Dörner and Mehrer [23]. In both cases, the time-averaged diffusivities decrease with increasing annealing time and reach a plateau value which pertains to diffusion in the glass after structural relaxation.…”

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Diffusion in Glassy Metals

Mehrer

2014

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Firstly, this paper reminds the reader of some basic facts about the glassy state, then of the various ways to produce amorphous metals with particular emphasis on the route of vitrification from the melt. Vitrification of an undercooled melt is the most important route from the viewpoint of the application of metallic glasses. We compare diffusion in some metallic glasses with related crystalline metals. Glassy metals, also called metallic glasses, comprise conventional [1] and bulk metallic glasses [2,3]. We remind the reader of the major experimental techniques for diffusion studies in metallic glasses. The paper then reviews our current understanding of diffusion in glassy metals (see also [4,5,6]), including conventional as well as bulk metallic glasses and undercooled melts. We cover the temperature dependence of diffusion in metallic glasses and discuss the spectrum of activation parameters of glassy metals and its difference to the corresponding one of crystalline metals. We mention the pressure dependence and the isotope effect and we discuss tracer diffusion and viscosity diffusion for a bulk metallic glass and its undercooled melt. Finally we mention computer simulations of atomic jump processes. The diffusion mechanism in metallic glasses differs from that in crystalline metals and involves thermally activated, highly collective (chain-like or caterpillar-like) diffusion jumps. Finally, we mention diffusion along shearbands in a plastically deformed glassy metal.

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Comparison of the Crystallization Behavior of Fe-Si-B-Cu and Fe-Si-B-Cu-Nb-Based Amorphous Soft Magnetic Alloys

Smith

Katakam

Nag

et al. 2014

Metall Mater Trans A

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⁵⁹Fe TRACER SELF-DIFFUSION IN AMORPHOUS Fe-Ni-B ALLOYS

Cited by 8 publications

References 2 publications

Isotope effect of Co diffusion in thin amorphous Co ₅₁ Zr ₄₉ layers during structural relaxation

Isotope effect of Co diffusion in thin amorphous Co ₅₁ Zr ₄₉ layers during structural relaxation

Diffusion in Glassy Metals

Comparison of the Crystallization Behavior of Fe-Si-B-Cu and Fe-Si-B-Cu-Nb-Based Amorphous Soft Magnetic Alloys

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59Fe TRACER SELF-DIFFUSION IN AMORPHOUS Fe-Ni-B ALLOYS

Cited by 8 publications

References 2 publications

Isotope effect of Co diffusion in thin amorphous Co 51 Zr 49 layers during structural relaxation

Isotope effect of Co diffusion in thin amorphous Co 51 Zr 49 layers during structural relaxation

Diffusion in Glassy Metals

Comparison of the Crystallization Behavior of Fe-Si-B-Cu and Fe-Si-B-Cu-Nb-Based Amorphous Soft Magnetic Alloys

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Product

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⁵⁹Fe TRACER SELF-DIFFUSION IN AMORPHOUS Fe-Ni-B ALLOYS

Isotope effect of Co diffusion in thin amorphous Co ₅₁ Zr ₄₉ layers during structural relaxation

Isotope effect of Co diffusion in thin amorphous Co ₅₁ Zr ₄₉ layers during structural relaxation