Characterization of bulk metallic glasses via fast differential scanning calorimetry

Pogatscher, Stefan; Leutenegger, Daniel; Hagmann, A; Uggowitzer, Peter J.; Löffler, Jörg F.

doi:10.1016/j.tca.2014.06.007

Cited by 35 publications

(18 citation statements)

References 25 publications

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“…We observe a significant asymmetry between the critical heating and cooling range. The critical heating range is about one to two orders of magnitude larger than the cooling range, in agreement with the previous crystallization kinetics study for a bulk MG 19 – 22 . This asymmetry is shown clearly in Fig.…”

Section: Resultssupporting

confidence: 91%

Tailoring crystallization phases in metallic glass nanorods via nucleus starvation

et al. 2017

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Many physical phenomena deviate from their established frameworks when the system approaches relevant length scales governing the phenomena. In crystallization, the relevant length scales are the nucleation length set by the nucleus size and density, and the growth length set by diffusion fields. Here we observe unexpected crystallization phenomena at the nanoscale, using metallic glass (MG) nanorods and in situ transmission electron microscopy. The asymmetry between critical heating and cooling rates disappears for small MG nanorods. Strikingly, an apparent single crystalline phase with its composition similar to the glass composition is observed for very small rods, in contrast to bulk samples. We attribute this to the lack of nuclei in small MG nanorods that approach the nucleation length, thus coined the term, nucleus starvation. By controlling the MG nanorod diameter and crystallization kinetics, we can tune the number of nuclei in a nanorod, thereby tailoring the resulting crystallization phases.

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Section: Resultssupporting

confidence: 91%

Tailoring crystallization phases in metallic glass nanorods via nucleus starvation

et al. 2017

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“…The EDS peaks come from chlorine was a residual product from NaCl solution, which is a main component of the fluids used for corrosion tests. The oxygen presence may suggest that the sample surface is mostly covered by the hydroxides Mg(OH) 2 and Ca(OH) 2 , which can be transformed into CaO and MgO oxides. Moreover, the presence of zinc can related to zinc oxide.…”

Section: Resultsmentioning

confidence: 99%

“…Bulk metallic glasses (BMGs) are usually known as relatively new materials required for various engineering applications because of their specific physiochemical properties [1][2][3][4][5]. The first report about Ca-based bulk metallic glasses was prepared by Amiya and Inoue in 2002.…”

Section: Introductionmentioning

confidence: 99%

Corrosion behavior of bioresorbable Ca-Mg-Zn bulk metallic glasses

Nowosielski

Bajorek

Babilas

2016

Journal of Non-Crystalline Solids

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“…The sample masses were estimated to be 1.7 to 3 μg according to the procedure given in ref. 18 . Reproducibility was checked by comparing the same thermal cycles at the start and end of each measurement series.…”

Section: Methodsmentioning

confidence: 99%

“…The first metallic glass discovered was a Au–Si system 14 . Since then Au-based bulk metallic glasses (BMGs) with very slow crystallization kinetics have been found 15 16 , and their suitability for FDSC investigations has recently been demonstrated 17 18 . They are also of interest for future applications, for example, in small-scale devices for information technology 19 20 , and are known to form various metastable crystalline states 21 .…”

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confidence: 99%

Solid–solid phase transitions via melting in metals

et al. 2016

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Observing solid–solid phase transitions in-situ with sufficient temporal and spatial resolution is a great challenge, and is often only possible via computer simulations or in model systems. Recently, a study of polymeric colloidal particles, where the particles mimic atoms, revealed an intermediate liquid state in the transition from one solid to another. While not yet observed there, this finding suggests that such phenomena may also occur in metals and alloys. Here we present experimental evidence for a solid–solid transition via the formation of a metastable liquid in a ‘real' atomic system. We observe this transition in a bulk glass-forming metallic system in-situ using fast differential scanning calorimetry. We investigate the corresponding transformation kinetics and discuss the underlying thermodynamics. The mechanism is likely to be a feature of many metallic glasses and metals in general, and may provide further insight into phase transition theory.

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Characterization of bulk metallic glasses via fast differential scanning calorimetry

Cited by 35 publications

References 25 publications

Tailoring crystallization phases in metallic glass nanorods via nucleus starvation

Tailoring crystallization phases in metallic glass nanorods via nucleus starvation

Corrosion behavior of bioresorbable Ca-Mg-Zn bulk metallic glasses

Solid–solid phase transitions via melting in metals

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