Modelling and simulation of twin-roll casting of bulk metallic glasses

Duggan, Gregory; Browne, David J.

doi:10.1007/s12666-009-0057-2

Cited by 12 publications

(3 citation statements)

References 8 publications

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“…As the most distinctive Zr-based metallic glass [25][26][27], Vit1 has a very strong glass formation ability and its critical cooling rate is as low as 1 K/s [28,29]. Therefore, this study utilized Vit1 as the experimental material for CC.…”

Section: Methodsmentioning

confidence: 99%

Effect of Casting Temperature Control on Microstructure and Properties of Continuously Cast Zr-Based Bulk Metallic Glass Slabs

Yang,

Ding,

Ren

2024

Coatings

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In this study, a novel crawler-type continuous casting (CC) technology was designed to efficiently and cost-effectively produce bulk metallic glass (BMG) slabs. As a crucial process parameter, casting temperature has a significant impact on the operation of CC devices and the quality of slabs. CC experiments of the Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 (Vit1) BMG slab were carried out at the casting temperatures of 1073 K, 1123 K, and 1173 K, and the microstructure and properties of slab samples were analyzed and studied. The experimental results indicate that the BMG slabs can be prepared by CC at 1173 K and 1123 K. When the temperature is reduced to 1073 K, the Be12Ti crystal phase precipitates inside the CC slab, which has a certain impact on the thermal stability and compressive performance of the slab. The control of casting temperature does not affect the glass-forming ability (GFA) of the slab in the CC process.

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Section: Methodsmentioning

confidence: 99%

Effect of Casting Temperature Control on Microstructure and Properties of Continuously Cast Zr-Based Bulk Metallic Glass Slabs

Yang,

Ding,

Ren

2024

Coatings

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“…Browne (1989) also developed a transient model to simulate process start-up conditions, and an inverse model to take experimentally determined roll sub-surface temperatures and compute the alloy/roll heat transfer coefficient. The steady state model of Browne and Hunt (Browne 1989) was later extended to permit simulation of the TRC of bulk metallic glasses (Duggan & Browne 2009; Browne et al 2011). The knowledge generated by the Hunt group at Oxford was used by Davy/Kvaerner to design and build well-controlled industrial TRCs.…”

Section: Researchmentioning

confidence: 99%

John David Hunt. 12 December 1936—8 December 2012

Browne

McCartney

2023

Biogr. Mems Fell. R. Soc.

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John Hunt was a scholar of the solidification of metallic alloys, and published seminal works that are of influence today in the design of alloy casting, welding and additive manufacturing processes. John was raised in the West Country of England, and following school did National Service in the Royal Air Force. He entered the University of Cambridge in 1957, being awarded an honours BA in metallurgy in 1960, and a PhD for studies of solidification of eutectic alloys in 1963. John met Ann Carroll during his Cambridge studies; they married in 1961 and later had three children. From 1963 to 1965 John carried out research with Ken Jackson at Bell Laboratories, New Jersey, USA. They published groundbreaking papers on solidification and pioneered the use of transparent organic analogues. John returned to England and, following a year working at the UK Atomic Energy Authority at Harwell, he joined the faculty at the University of Oxford in 1966. During a 36-year academic career at Oxford, John made significant contributions to the scientific understanding of solidification on many topics, including dendritic array growth, eutectic and peritectic solidification, the columnar-to-equiaxed transition and twin roll casting. As well as being a talented experimentalist, he published many groundbreaking theoretical analyses and also pioneered the use of numerical methods for the simulation of solidification phenomena. He was an accomplished educator of undergraduate and postgraduate students, and a fellow of St Edmund Hall, Oxford. John was a family man, and kept geese and pigs, grew apples and made legendary cider at his old farmhouse home north of Oxford.

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“…Thus incorporation of these thin ribbons into tools for patterning polymers is unlikely to be of practical use. However advances in twin roll casting of BMGs may offer possibilities for producing larger dimensioned, flat sections [18][19][20]. The technique, even if matured sufficiently, will inevitably suffer from feature size limitations similar to single roller techniques.…”

Section: Direct Casting Of Toolsmentioning

confidence: 99%

Bulk Metallic Glass Multiscale Tooling for Molding of Polymers with Micro to Nano Features: A Review

Browne

Stratton

Gilchrist

et al. 2012

Metall Mater Trans A

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There is a growing demand for single-use disposable polymer devices with features at submicron scales. This requires resilient tooling which can be patterned to scales of the order of hundreds of nm. The requisite topology can be imparted to silicon but it is too brittle to be of use in a die to mold thousands of plastic parts. The polycrystalline nature of tool steel means it cannot be patterned with sub-micron detail. Some bulk amorphous alloys have the requisite mechanical properties to be viable as materials for such dies, and can be patterned -e.g. via embossing as a supercooled liquid into MEMS silicon or using FIB -with sub-micron features which may persevere over many thousands of molding cycles. The composition of the amorphous alloy must be carefully selected to suit the particular molding application (polymer/process). The state-of-the-art of is presented, along with results of our recent experimental investigations.

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Modelling and simulation of twin-roll casting of bulk metallic glasses

Cited by 12 publications

References 8 publications

Effect of Casting Temperature Control on Microstructure and Properties of Continuously Cast Zr-Based Bulk Metallic Glass Slabs

Effect of Casting Temperature Control on Microstructure and Properties of Continuously Cast Zr-Based Bulk Metallic Glass Slabs

John David Hunt. 12 December 1936—8 December 2012

Bulk Metallic Glass Multiscale Tooling for Molding of Polymers with Micro to Nano Features: A Review

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