Bulk metallic glass casting investigated using high-speed infrared monitoring and complementary fast scanning calorimetry

Haag, Fabian; Geisel, Steffen; Kurtuldu, Güven; Löffler, Jörg F.

doi:10.1016/j.actamat.2018.02.029

Cited by 19 publications

(7 citation statements)

References 47 publications

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“…As a result, the hypothesis of a complex thermal history remains as a valid hypothesis. Based on conclusions made by Grànàsy [15] and Haag et al [16] suggesting that the thermal dynamic of the melt plays a key role, we thus believe that each process results in a different thermal history of the melt and therefore of the solidified alloy. To explain this, we can split the casting process in three successive steps: filling, conformation and cooling (see figure 4).…”

Section: Resultsmentioning

confidence: 72%

“…In suction casting, the melt is pushed inside the mould cavity by a pressure difference while in the injection casting process, it is pushed by a plunger. While the filling step is known to be challenging to understand [16], we believe that no significant differences arise in the melt at this stage between both processes. However, the second step is thought to be essential for the presence or not of surface crystallisation.…”

Section: Resultsmentioning

confidence: 91%

“…Depending on the quenching rate, crystallites were shown to develop (a) uniformly over the whole cross-section or localized either (b) near the free surface of the ribbon, (c) or in the center part of the ribbon (d) or at the contact surface with the wheel. More recently, Haag et al [16] experimentally corroborated such complicated thermal history occuring in the melt during suction casting of an AuCuAgSi BMG. Using high-speed infrared monitoring, they were able to track the temperature of the alloy in several locations during the entire casting process.…”

Section: Introductionmentioning

confidence: 85%

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Effect of the alloy/mould contact on surface crystallisation of a biocompatible ZrCoAl bulk metallic glass

Guérin¹,

Daudin²,

Lenain³

et al. 2020

J. Phys.: Condens. Matter

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Casting of metallic glasses (MG) sometimes induces surface crystallisation despite the fact that the surface is expected to be the region where the cooling rate is the highest. This phenomenon has been observed on various MG, even for those with large critical diameters. Such surface crystallisation can be detrimental when the target applications are focused on surface properties, such as corrosion resistance for biomedical applications.In this paper, a Zr 56 Co 28 Al 16 bulk metallic glass (BMG) with a large critical diameter was used. We reveal that samples processed using common copper-mould suction casting present surface crystallisation up to 20 µm in thickness, greatly deteriorating corrosion resistance. Using in-house highly reproducible suction casting and injection micro-casting processes, the influence of the processing parameters (mould material and temperature, working atmosphere, applied pressure) were investigated. The origin of surface crystallisation was found to arise from the complex thermal history of the alloy depending on the alloy/mould contact quality. By ensuring a tight contact between the solidifying alloy and the mould, BMG samples without crystalline surface defects were obtained.

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Section: Resultsmentioning

confidence: 72%

Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 85%

See 1 more Smart Citation

Effect of the alloy/mould contact on surface crystallisation of a biocompatible ZrCoAl bulk metallic glass

Guérin¹,

Daudin²,

Lenain³

et al. 2020

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

show abstract

“…DSC has a wide spectrum of applications ranging from simple heat of fusion evaluation() to advanced material microstructural evolution analyses and complex chemical reaction process identification . The versatility of the DSC is vast and researchers apply it to assess: coal,() cjceass,() waste,() catalysts,() minerals,() cement,() ceramics,() alloys,() and polymers. () Applications include: gasification,() pyrolysis,() combustion,() adsorption,() desorption,() calcination,() dehydration,() thermal stability,() phase transitions,() phase diagrams,() polymer crystallization,() glass transition, curing time, and reaction kinetics …”

Section: Applicationsmentioning

confidence: 99%

Experimental methods in chemical engineering: Differential scanning calorimetry—DSC

et al. 2018

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Differential calorimetry assesses energy flow between a sample and its environment. The sample may be heated at a known heating rate (either constant or temperature modulated), or held in an isothermal environment or adiabatic environment depending on instrument and experimental design. The subset of differential calorimetry that deals with known heating or cooling rates is termed differential scanning calorimetry (DSC) and is a foundational technique to modern thermodynamics. It reports the heat flow versus temperature or time from which we calculate specific heat capacity at constant pressure, c P , enthalpy of fusion, and the heat of reaction. Moreover, it identifies how microstuctural properties evolve and thermal arrests-a characteristic of phase transitions. Heat-flux DSCs measure the temperature difference between a reference and a sample that sit on a thin two-dimensional plate. Power compensated DSCs heat reference material and the sample in independent furnaces while maintaining each at the same temperature. The Tian-Calvet DSC is similar to the heat-flux DSC, but minimizes error induced at high temperature with ring shaped thermopiles that surround the reference and the sample and in most designs incorporate the independent furnaces characteristic of heat flux DSC (three-dimensional heat flow probe). Convection and radiation energy leaks compromise accuracy above 600 • C, particularly for pan-style heat flux and power-compensated DSC, which are sensitive to heat transfer by conduction only. The Tian-Calvet DSC maximizes the signal-to-noise ratio by enveloping the sample and reference in the thermopile. Web of Science indexed 11 800 articles in 2016 and 2017 that mentioned DSC and assigned 789 to chemical engineering, which ranks it 5th after polymer science, material science, physical chemistry, and multi-disciplinary chemistry. A bibliometric analysis recognizes four research clusters: polymers and nano-composites, alloys and kinetics, nano-particles and drug delivery, and fibres.

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“…Metallic glasses (MGs) [1,2], particularly bulk metallic glasses (BMGs) [3,4] produced by casting [5] or other methods [6], attract significant attention because of their high strength, high hardness, good wear resistance [7] and large elastic deformation [8,9]. Although most BMGs lack plasticity even in the as-cast state, there are several examples of monolithic BMGs with significant plasticity [10,11].…”

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confidence: 99%

Phase separation process preventing thermal embrittlement of a Zr-Cu-Fe-Al bulk metallic glass

et al. 2019

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The structural changes and mechanical properties of Zr63Cu22Fe5Al10 bulk metallic glass (BMG), and a Zr63Cu27Al10 glass made for comparison, were studied on annealing below the crystallization temperature. The phase composition of the samples was studied by conventional X-ray diffractometry and high-resolution transmission electron microscopy including the atomic-scale elemental mapping. The samples were mechanically tested in compression. The Zr63Cu22Fe5Al10 bulk metallic glass shows high strength and good deformability at room temperature both in the as-cast state and after prolonged structural relaxation below the crystallization temperature. The reasons for such behavior are discussed in the present work.

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Bulk metallic glass casting investigated using high-speed infrared monitoring and complementary fast scanning calorimetry

Cited by 19 publications

References 47 publications

Effect of the alloy/mould contact on surface crystallisation of a biocompatible ZrCoAl bulk metallic glass

Effect of the alloy/mould contact on surface crystallisation of a biocompatible ZrCoAl bulk metallic glass

Experimental methods in chemical engineering: Differential scanning calorimetry—DSC

Phase separation process preventing thermal embrittlement of a Zr-Cu-Fe-Al bulk metallic glass

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