Impact of Sulfur on the melt dynamics of glass forming Ti75Ni25−<i>x</i>S<i>x</i>

Wilden, Johanna; Yang, Fan; Holland‐Moritz, D.; Szabó, Sandro; Lohstroh, Wiebke; Bochtler, Benedikt; Busch, Ralf; Meyer, Andreas

doi:10.1063/5.0012409

Cited by 14 publications

(5 citation statements)

References 43 publications

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“…[36]). The activation energy in Pd-Ni-S melts corresponds to about the half of the activation energy in Ti 75 Ni 20 S 5 melts with E A = 657 meV [14].…”

Section: Resultsmentioning

confidence: 97%

“…Within the ternary Pd-Ni-S system, Pd 37 Ni 37 S 26 represents the best glass former with a critical casting thickness of 2 mm, whereas Pd 31 Ni 42 S 27 exhibits the best thermal stability against crystallization upon heating from the glassy state [12,13]. A recent study on Ti-Ni-S melts reveals that S-addition affects the melt dynamics differently [14] than element addition in Ni-P-based melts [8]. Here the Ti/Ni self-diffusion and the packing fraction decrease simultaneously upon S-addition.…”

Section: Introductionmentioning

confidence: 99%

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Ni self-diffusion in glass forming Pd–Ni–S melts

Wilden

Yang

Günther

et al. 2021

J. Phys.: Condens. Matter

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The Ni self-diffusion in glass forming Pd40Ni40S20, Pd37Ni37S26 and Pd31Ni42S27 melts was probed by incoherent, quasielastic neutron scattering over a temperature range between 773 and 1023 K. The Ni self-diffusion coefficients are on a 10−10 m2 s−1–10−9 m2 s−1 scale and barely change with composition. Each composition exhibits an Arrhenius-type temperature dependence of the Ni self-diffusion coefficients, which results in activation energies ranging from E A = 348 ± 16 meV for Pd40Ni40S20 to E A = 387 ± 6 meV for Pd37Ni37S26. The structural relaxation shows a stretched exponential behavior even far above the liquidus temperatures. In addition, the viscosity of the Pd37Ni37S26 melt was measured under reduced gravity conditions. The diffusion calculated from the viscosity reveals a significant deviation from the measured Ni self-diffusion by a factor between 4 and 8. This may indicate a dynamic decoupling between the atoms within the Pd–Ni–S equilibrium melts.

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“…[36]). The activation energy in Pd-Ni-S melts corresponds to about the half of the activation energy in Ti 75 Ni 20 S 5 melts with E A = 657 meV [14].…”

Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Ni self-diffusion in glass forming Pd–Ni–S melts

Wilden

Yang

Günther

et al. 2021

J. Phys.: Condens. Matter

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“…In the Ti-Ni-S melt, the melt dynamics slow down with increasing sulfur content, as a result of potential covalent-like interactions involved. 14 Despite the chemical similarity (e.g., Ti-Nb forms a completely miscible binary phase diagram 39 ), the melt dynamics does not seems to be affected by the sulfur addition for Ni 58 Nb 39 S 3 . However, a distinct difference is that overall the sulfur concentration in the studied Ti-Ni-S alloys is higher, in the range of 5 − 8 at.…”

Section: Article Pubsaiporg/aip/apmmentioning

confidence: 99%

“…% has indeed been observed, whereas in the Pd-Ni-S alloy melts, where the sulfur content is considerably higher, the diffusive dynamics of Ni depends only very weakly on the sulfur concentration. 14,15 This indicates that the mechanisms of improved GFA upon sulfur addition can be different in different alloy systems.…”

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confidence: 99%

Impact of sulfur addition on the structure and dynamics of Ni–Nb alloy melts

Grund,

Holland-Moritz,

Khademorezaian

et al. 2024

APL Materials

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We investigated the change in the structure and dynamics of a Ni–Nb bulk metallic glass upon sulfur addition on both microscopic and macroscopic scales. With the sulfur concentration of 3 at. %, where the composition Ni58Nb39S3 exhibits the best glass forming ability in the investigated sulfur concentration range, both the equilibrium and undercooled melt dynamics remain almost unchanged. Only in the glassy state does sulfur seem to result in mass transport less decoupled to the viscosity of the undercooled liquid, where the measured Ag tracer diffusion coefficient is slower in the ternary alloy. With the structural disorder introduced by the alloying sulfur, the improved glass forming ability is attributed to geometrical frustration, where crystal nucleation requires a depletion of sulfur and hence long range diffusion, as long as no primary sulfur-containing crystalline phase is involved.

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“…Minor additions of certain elements are added to a known alloy composition, changing the crystallization sequence and kinetics. In the last years, our group discovered sulfur as a constituent in BMGs [16][17][18][19][20], allowing for a large variety of new approaches for alloy development. It was also found that additions of sulfur significantly improve the thermal stability of Vit105 upon heating [16].…”

Section: Introductionmentioning

confidence: 99%

Changes in the crystallization sequence upon sulfur addition in the Zr52.5Cu17.9Ni14.6Al10Ti5<

Bochtler

Salguero

Kuball

et al. 2021

Phys. Rev. Materials

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Bulk metallic glasses (BMGs) surpass the strength of steels and possess the elasticity and formability of polymers. The key to obtain these properties is to conserve the amorphous structure of a metallic melt and avoid crystallization during processing. In this work, a change in the crystallization sequence in the widely used BMG Zr 52.5 Cu 17.9 Ni 14.6 Al 10 Ti 5 (Vit105) upon the addition of sulfur (Zr 51.45 Cu 17.54 Ni 14.31 Al 9.8 Ti 4.9 S 2 ; Vit105 S 2 ) is revealed by in situ high-energy x-ray diffraction, both upon heating from the glassy state and upon cooling from the liquid state during electrostatic levitation. This methodology proves to be a powerful tool to elucidate the complete crystallization behavior of complex BMG-forming liquids. The experiments show that the addition of sulfur changes the crystallization sequence and phases in a different manner upon cooling from the liquid state than upon heating from the glassy state. The thermal stability at low temperatures upon heating is increased, as the supercooled liquid region is extended from 60 to 77 K and the glass transition temperature increases from 671 to 692 K. However, the thermal stability is decreased upon cooling, causing a reduced glass-forming ability.

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Impact of Sulfur on the melt dynamics of glass forming Ti75Ni25−xSx

Cited by 14 publications

References 43 publications

Ni self-diffusion in glass forming Pd–Ni–S melts

Ni self-diffusion in glass forming Pd–Ni–S melts

Impact of sulfur addition on the structure and dynamics of Ni–Nb alloy melts

Changes in the crystallization sequence upon sulfur addition in the Zr52.5Cu17.9Ni14.6Al10Ti5<

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