Composites of amorphous and nanocrystalline Zr–Cu–Al–Nb bulk materials synthesized by spark plasma sintering

Drescher, Philipp; Witte, Kerstin; Yang, Bin; Steuer, R.; Keßler, Olaf; Burkel, E.; Schick, Christoph; Seitz, Hermann

doi:10.1016/j.jallcom.2016.01.161

Cited by 17 publications

(6 citation statements)

References 31 publications

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“…The Zr 48 Cu 36 Al 8 Ag 8 powder was consolidated under argon atmosphere into cylindrical specimens (dimensions: 10 mm diameter and about 10 mm height) by uniaxial hot pressing at different temperatures (743, 753, and 758 K) using an electro-hydraulic universal axial pressing machine (WEBER PWV 30 EDS, Figure 3a,b). We used a pressure of 900 MPa, which represents the upper limit of pressure usable in our hydraulic pressing machine in the temperature range used in this work, and 10 min holding time, which is a good compromise between good densification and minimum crystallization for a series of metallic glass powders, including Ni 52.5 Nb 10 Zr 15 Ti 15 Pt 7.5 [25], Zr 70 Cu 24 Al 4 Nb 2 [26], and Zr 55 Cu 30 Ni 5 Al 10 [27]. A copper coil was used to heat the powders at a heating rate of about 40 K/min.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Bulk Zr48Cu36Al8Ag8 Metallic Glass by Hot Pressing of Amorphous Powders

Ciftci

Uhlenwinkel

et al. 2021

JMMP

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The critical cooling rate necessary for glass formation via melt solidification poses inherent constraints on sample size using conventional casting techniques. This drawback can be overcome by pressure-assisted sintering of metallic glass powders at temperatures above the glass transition, where the material shows viscous-flow behavior. Partial crystallization during sintering usually exacerbates the inherent brittleness of metallic glasses and thus needs to be avoided. In order to achieve high density of the bulk specimens while avoiding (or minimizing) crystallization, the optimal combination between low viscosity and long incubation time for crystallization must be identified. Here, by carefully selecting the time–temperature window for powder consolidation, we synthesized highly dense Zr48Cu36Ag8Al8 bulk metallic glass (BMG) with mechanical properties comparable with its cast counterpart. The larger ZrCu-based BMG specimens fabricated in this work could then be post-processed by flash-annealing, offering the possibility to fabricate monolithic metallic glasses and glass–matrix composites with enhanced room-temperature plastic deformation.

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Section: Methodsmentioning

confidence: 99%

Synthesis of Bulk Zr48Cu36Al8Ag8 Metallic Glass by Hot Pressing of Amorphous Powders

Ciftci

Uhlenwinkel

et al. 2021

JMMP

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“…Powders of Ni 59 Zr 15 Ti 13 Si 3 Sn 2 Nb 7 Al, [121] Fe 75 Nb 3 Si 13 B 9 , [122] Cu 46 Zr 42 Al 7 Y 5 , [123] Zr 55 Cu 30 Al 10 Ni 5 , [124] Zr 70 Cu 24 Al 4 Nb 2 , [125] Ti 45 Zr 10 Cu 31 Pd 10 Sn 4 , [126] Mg 65 Cu 25 Gd 10 , [127] Hf 55 Cu 28 Ni 5 Al 12 , [128] and ZrCu 39.85 Y 2.37 Al 1.8 , [129] among many others, have also been prepared using the SPS technique with varying degrees of success, always optimizing for a temperature between the glass transition and crystallization temperatures, where the powders exhibit lower Vit106 that are normalized with respect to their glass transition temperatures and nose times. Reproduced with permission.…”

Section: Sinteringmentioning

confidence: 99%

“…Powders of Ni 59 Zr 15 Ti 13 Si 3 Sn 2 Nb 7 Al, [ 121 ] Fe 75 Nb 3 Si 13 B 9 , [ 122 ] Cu 46 Zr 42 Al 7 Y 5 , [ 123 ] Zr 55 Cu 30 Al 10 Ni 5 , [ 124 ] Zr 70 Cu 24 Al 4 Nb 2 , [ 125 ] Ti 45 Zr 10 Cu 31 Pd 10 Sn 4 , [ 126 ] Mg 65 Cu 25 Gd 10 , [ 127 ] Hf 55 Cu 28 Ni 5 Al 12 , [ 128 ] and ZrCu 39.85 Y 2.37 Al 1.8 , [ 129 ] among many others, have also been prepared using the SPS technique with varying degrees of success, always optimizing for a temperature between the glass transition and crystallization temperatures, where the powders exhibit lower viscosity. Indeed, the viscosity of the specimens is relevant at all temperatures and impacts sample contraction during the beginning stages of densification by [ 130 ]

\frac{Δ L}{L_{normalo}} ≅ \frac{3 γ R T^{2}}{4 D c Q η_{normalo}} exp (- \frac{Q}{R T})

where

Δ L / L_{normalo}

is the change in axial length of the specimen based on ram displacement, γ is the surface energy of the powders, R is the gas constant, T is the temperature, D is the average particle diameter, c is the heating rate, Q is the activation energy for viscous flow, and η o is the pre‐exponential constant in

η = η_{normalo} exp (\frac{Q}{R T})

…”

Section: Manufacturing Approachesmentioning

confidence: 99%

Latest Advances in Manufacturing and Machine Learning of Bulk Metallic Glasses

et al. 2023

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In this review, two interrelated areas are focused on for the development of novel amorphous metallic alloys, namely, materials processing and machine learning techniques for the design of new alloy compositions. Findings, barriers, and opportunities are described, targeting powder production and sintering, additive manufacturing, and postprocessing techniques, followed by the latest developments in artificial intelligence algorithms for both the design of new alloys and for alloy classification tasks.

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“…The highest hardness of 1341 HV was obtained at the sintering temperature of 550°C. Other researchers have used casting and atomising powder, followed by sintering by the SPS process to produce parts with an amorphous structure for Zr, Cu, Mg and Ti-based alloys [21][22][23][24]. It has been reported that relatively low hardness and poor corrosion resistance of iron-based alloys are factors, which limit their use.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterisation of a novel Fe-based nanocomposite by mechanical alloying and spark plasma sintering

2021

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To improve low hardness and poor corrosion resistance of the Fe-based alloys, Fe-Ti-Al-B-Si-C-P-Cr novel alloy was prepared using mechanical alloying and spark plasma sintering (SPS). Two types of mills, including of high-energy planetary (HEP) and SPEX(S) ball mills (BM) were used to reach the solid solution. Mechanical alloying by the HEP route led to the formation of the Fe(α) phase after 60 h, while its milling after 15 h by high-energy SPEX mill led to the formation of the Fe(α) solid solution. After sintering of as-milled powders by SPS, the composite of Fe (α)/nanocrystalline was obtained. The micro-hardness of the HEP-SPS and the S-SPS samples obtained about 689.5 ± 0.15 and 2068.5 ± 0.18 HV 0.3 , respectively. The lowest corrosion current density and the highest polarization resistance were related to the HEP-SPS sample and was calculated to be 0.51 µA/cm 2 and 41.668 KHz/cm 2 , respectively.

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Composites of amorphous and nanocrystalline Zr–Cu–Al–Nb bulk materials synthesized by spark plasma sintering

Cited by 17 publications

References 31 publications

Synthesis of Bulk Zr48Cu36Al8Ag8 Metallic Glass by Hot Pressing of Amorphous Powders

Synthesis of Bulk Zr48Cu36Al8Ag8 Metallic Glass by Hot Pressing of Amorphous Powders

Latest Advances in Manufacturing and Machine Learning of Bulk Metallic Glasses

Synthesis and characterisation of a novel Fe-based nanocomposite by mechanical alloying and spark plasma sintering

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