Non-crystalline Structure in Solidified Gold–Silicon Alloys

Klement, William; Willens, R. H.; Duwez, Pol

doi:10.1038/187869b0

Cited by 2,568 publications

(1,028 citation statements)

References 3 publications

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“…While conventional metallic glasses require rapid solidification with a cooling rate of about 10 6 K/s [2,3], BMGs can be formed at cooling rates between 1 and 100 K/s, leading to the possibility of casting much thicker objects [4]. At first, Fe-based BMGs were developed with the purpose of obtaining very good soft ferromagnetic properties due to the structural isotropy of the material (high Fe content alloys in Fe-B-Si system) [1,5].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of Fe-based bulk metallic glasses in plate form

Lavorato

Fiore

Castellero

et al. 2012

Physica B: Condensed Matter

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Amorphous alloys with composition (at%) Fe 48 Cr 15 Mo 14 C 15 B 6 Gd 2 (alloy A) and Fe 48 Cr 15 Mo 14 C 15 B 6 Y 2 (alloy B) were prepared either using pure elements (A and B1) and a commercial AISI430 steel as a base material (B2). When prepared from pure elements both alloys (A and B1) could be cast in plate form with a fixed thickness of 2 mm and variable lengths between 10 and 20 mm by means of copper-mold injection in air atmosphere. In the case of alloy B2, prepared using commercial grade raw materials, rods of 2 mm diameter were obtained.X-ray diffraction and scanning electron microscopy observations confirmed that an amorphous structure was obtained in all the as-cast samples. A minor fraction of crystalline phases (oxides and carbides) was detected on the as-cast surface. Differential scanning calorimetry measurements showed a glass transition temperature at 856 K for alloy A and 841 K for alloy B1, and an onset crystallization temperature of 887 K for alloy A and 885 K for alloy B1. In the case of alloy B2 a slightly different crystallization sequence was observed.Values of hardness ( 13 GPa) and the Young modulus ( 180 GPa) were measured by nanoinden-tation for both the alloys. The effects of adverse casting conditions (such as air atmosphere, non-conventional injection copper mold casting and partial replacement of pure elements with commercial grade raw materials) on the glass formation and properties of the alloy are discussed.

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Section: Introductionmentioning

confidence: 99%

Preparation and characterization of Fe-based bulk metallic glasses in plate form

Lavorato

Fiore

Castellero

et al. 2012

Physica B: Condensed Matter

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“…In the 1960s, Duwez and his co-workers devised the production method for a new group of materials called the amorphous materials [2,3]. Samples obtained by this process produces ribbon-shaped samples of approximate thickness 40 µm by rapidly cooling the molten alloy on a copper wheel at a rate of 10 4 10 6 K/s [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…Samples obtained by this process produces ribbon-shaped samples of approximate thickness 40 µm by rapidly cooling the molten alloy on a copper wheel at a rate of 10 4 10 6 K/s [2,3].…”

Section: Introductionmentioning

confidence: 99%

Influence of 1% Addition of Nb and W on the Relaxation Process in Classical Fe-Based Amorphous Alloys

et al. 2015

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This paper features investigations into the in uence of small additions of alloying elements on: structure, as well as the temporal and thermal stability of magnetic properties, and the disaccommodation e ect, for the following amorphous alloys: Fe61Co10Y8Me1B20 (where Me = Nb, W). The structure of the investigated samples has been con rmed by the Mössbauer spectroscopy. The obtained results indicate a strong correlation between the structure and the disaccommodation of the studied alloys. The Mössbauer studies reveal di erent con gurations of atoms in the amorphous alloy samples, and the results indicate various potential barriers between orientations of atom pairs. For this reason, to describe the disaccommodation e ect, the distribution of activation energy should be taken into account. The distribution of activation energy has been related to the distribution of relaxation times.

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“…1 Due to the absence of microstructural features like grain-boundaries or heterophase boundaries that are typical for crystalline materials, MGs exhibit excellent properties, such as high yield strength, advantageous soft and hard magnetic properties, high corrosion resistance and biocompatibility. 2 However, at room temperature MGs are not ductile and tend to fail in a brittle fashion when loaded either in compression or tension, 3 which limits their applicability.…”

mentioning

confidence: 99%

In situ compression study of taper-free metallic glass nanopillars

Kuzmin

Pei

Hosson

2011

Applied Physics Letters

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Because tapering leads to inevitable artifacts in the analyses of compression experiments on micrometer sized pillars, in this study taper-free nanosized pillars of Zr-based metallic glass of Zr 61.8 Cu 18 Ni 10.2 Al 10 composition with diameter ranging from 600 to 90 nm were fabricated. These pillars were compressed in situ in a transmission electron microscope as a function of pillar diameter. Under compression each pillar of large diameter exhibits predominant inhomogeneous and intermittent plastic flow characterized by shear banding ͑SB͒ events. However, pillars around 150 nm in diameter and below show homogeneous deformation during compression without SB.

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Non-crystalline Structure in Solidified Gold–Silicon Alloys

Cited by 2,568 publications

References 3 publications

Preparation and characterization of Fe-based bulk metallic glasses in plate form

Preparation and characterization of Fe-based bulk metallic glasses in plate form

Influence of 1% Addition of Nb and W on the Relaxation Process in Classical Fe-Based Amorphous Alloys

In situ compression study of taper-free metallic glass nanopillars

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