All Outputs (99)

A high-speed imaging and modeling study of dendrite fragmentation caused by ultrasonic cavitation (2012)
Journal Article
Shu, D., Sun, B., Mi, J., & Grant, P. S. (2012). A high-speed imaging and modeling study of dendrite fragmentation caused by ultrasonic cavitation. Metallurgical and materials transactions. A, Physical metallurgy and materials science, 43(10), 3755-3766. https://doi.org/10.1007/s11661-012-1188-3

The dynamic behavior of ultrasound-induced cavitation bubbles and their effect on the fragmentation of dendritic grains of a solidifying succinonitrile 1 wt pct camphor organic transparent alloy have been studied experimentally using high-speed digit... Read More about A high-speed imaging and modeling study of dendrite fragmentation caused by ultrasonic cavitation.

Modelling the electromagnetic separation of non-metallic particles from liquid metal flowing through a two-stage multichannel (2011)
Journal Article
Shu, D., Mi, J., Wang, J., & Sun, B. (2011). Modelling the electromagnetic separation of non-metallic particles from liquid metal flowing through a two-stage multichannel. Isij International, 51(1), 21-26. https://doi.org/10.2355/isijinternational.51.21

A two-stage multichannel was designed to increase the efficiency of separating non-metallic particles from liquid metal flowing through an alternating magnetic field. Numerical method was developed to calculate the particle concentration and separati... Read More about Modelling the electromagnetic separation of non-metallic particles from liquid metal flowing through a two-stage multichannel.

An implicit parallel multigrid computing scheme to solve coupled thermal-solute phase-field equations for dendrite evolution (2011)
Journal Article
Guo, Z., Mi, J., & Grant, P. S. (2012). An implicit parallel multigrid computing scheme to solve coupled thermal-solute phase-field equations for dendrite evolution. Journal of Computational Physics, 231(4), 1781-1796. https://doi.org/10.1016/j.jcp.2011.11.006

An implicit, second-order space and time discretization scheme together with a parallel multigrid method involving a strip grid domain partitioning has been developed to solve fully coupled, nonlinear phase field equations involving solute and heat t... Read More about An implicit parallel multigrid computing scheme to solve coupled thermal-solute phase-field equations for dendrite evolution.

Gleeble experiments concerning dendrite re-melting and its role in microstructural evolution in spray formed high-alloy metals (2011)
Journal Article
Zhang, Y., Liu, N., Li, Z., Zhang, G., Yuan, H., Xu, W., Gao, Z., & Mi, J. (2011). Gleeble experiments concerning dendrite re-melting and its role in microstructural evolution in spray formed high-alloy metals. Rare Metals, 30(SUPPL.1), 401-404. https://doi.org/10.1007/s12598-011-0312-7

An experimental approach was designed to understand dendrite fragmentation of atomized droplets deposition in spray materials, and to study the relationship between dendrite fragmentation behavior and subsequent microstructural evolution. A Gleeble 3... Read More about Gleeble experiments concerning dendrite re-melting and its role in microstructural evolution in spray formed high-alloy metals.

An Al-Si-Ti hierarchical metal-metal composite manufactured by co-spray forming (2011)
Journal Article
Kelly, A. J., Mi, J., Sinha, G. V., Krug, P., Crosa, F., Audebert, F., & Grant, P. S. (2011). An Al-Si-Ti hierarchical metal-metal composite manufactured by co-spray forming. Journal of Materials Processing Technology, 211(12), 2045-2049. https://doi.org/10.1016/j.jmatprotec.2011.07.001

Spray forming with co-injection of a solid particulate phase to form a homogeneous distribution within the final spray formed billet has been studied as a new route to manufacturing metal-metal composites at large scale with negligible oxide. 12 wt%T... Read More about An Al-Si-Ti hierarchical metal-metal composite manufactured by co-spray forming.

A quantitative study of solute diffusion field effects on heterogeneous nucleation and the grain size of alloys (2011)
Journal Article
Shu, D., Sun, B., Mi, J., & Grant, P. S. (2011). A quantitative study of solute diffusion field effects on heterogeneous nucleation and the grain size of alloys. Acta Materialia, 59(5), 2135-2144. https://doi.org/10.1016/j.actamat.2010.12.014

The nucleation ability of inoculating particles inside the solute diffusion zone around growing grains during alloy solidification is studied using a spherical, equiaxed dendritic grain model coupled with a new modified free growth model to predict t... Read More about A quantitative study of solute diffusion field effects on heterogeneous nucleation and the grain size of alloys.

Spray forming of bulk ultrafine-grained Al-Fe-Cr-Ti (2010)
Journal Article
Banjongprasert, C., Hogg, S. C., Liotti, E., Kirk, C. A., Thompson, S. P., Mi, J., & Grant, P. S. (2010). Spray forming of bulk ultrafine-grained Al-Fe-Cr-Ti. Metallurgical and materials transactions. A, Physical metallurgy and materials science, 41(12), 3208-3215. https://doi.org/10.1007/s11661-010-0386-0

An Al-2.7Fe-1.9Cr-1.8Ti alloy has been spray formed in bulk and the microstructure and properties compared with those of similar alloys produced by casting, powder aomization (PA), and mechanical alloying (MA) routes. In PA and MA routes, a nanoscale... Read More about Spray forming of bulk ultrafine-grained Al-Fe-Cr-Ti.

Microstructure and property development in spray formed and extruded Al-Mg-Li-Zr alloys for aerospace and autosport applications (2010)
Journal Article
Hogg, S. C., Mi, J., Nilsen, K. E., Liotti, E., & Grant, P. S. (2010). Microstructure and property development in spray formed and extruded Al-Mg-Li-Zr alloys for aerospace and autosport applications. Materials Science and Engineering Technology / Materialwissenschaft und Werkstofftechnik, 41(7), 562-567. https://doi.org/10.1002/mawe.201000643

Low density Al-4Mg-1.3Li-0.4Zr and Al-6Mg-1.6Li-0.4Zr alloys were spray formed and the billets extruded under a range of conditions. The alloy compositions were selected to provide an attractive balance of tensile strength and elongation, without rel... Read More about Microstructure and property development in spray formed and extruded Al-Mg-Li-Zr alloys for aerospace and autosport applications.

Modelling and experiments concerning dendrite re-melting and its role in microstructural evolution in spray formed Ni superalloys (2010)
Journal Article
Zhang, Y., Guo, Z., Zhang, G., Mi, J. W., & Grant, P. S. (2010). Modelling and experiments concerning dendrite re-melting and its role in microstructural evolution in spray formed Ni superalloys. Materials Science Forum, 654-656, 1363-1366. https://doi.org/10.4028/www.scientific.net/msf.654-656.1363

This paper presents a combined experimental and modelling approach to understand dendrite fragmentation of atomised metal alloy droplets during deposition in spray forming, and to study quantitatively the relationship between this dendrite fragmentat... Read More about Modelling and experiments concerning dendrite re-melting and its role in microstructural evolution in spray formed Ni superalloys.

Phase field modelling of dendrite fragmentation during thermal shock (2010)
Journal Article
Guo, Z., Mi, J. W., & Grant, P. S. (2010). Phase field modelling of dendrite fragmentation during thermal shock. Materials Science Forum, 654-656, 1524-1527. https://doi.org/10.4028/www.scientific.net/msf.654-656.1524

The dendrite grain growth of a succinonitrile based transparent alloy, their fragmentation under an intense thermal shock and the subsequnet morphology evolution during solidification have been simulated using a two-dimensional binary alloy phase fie... Read More about Phase field modelling of dendrite fragmentation during thermal shock.

Refinement of TiB2 in Al-Ti-B grain refiner alloys by ultrasound and the effect on Al grain size (2010)
Journal Article
Shu, D., Sun, B. D., Mi, J. W., & Grant, P. S. (2010). Refinement of TiB2 in Al-Ti-B grain refiner alloys by ultrasound and the effect on Al grain size. Materials Science Forum, 654-656, 958-961. https://doi.org/10.4028/www.scientific.net/msf.654-656.958

High-intensity ultrasound was applied during the preparation of an Al-5Ti-1B master alloy when reacting fluoride salts with molten Al. The reaction rate was significantly increased with TiB2 particles of much reduced mean diameter and narrow width sp... Read More about Refinement of TiB2 in Al-Ti-B grain refiner alloys by ultrasound and the effect on Al grain size.

Modeling the deposition dynamics of a twin-atomizer spray forming system (2010)
Journal Article
Zhang, G., Li, Z., Zhang, Y., Mi, J., & Grant, P. S. (2010). Modeling the deposition dynamics of a twin-atomizer spray forming system. Metallurgical and Materials Transactions B, 41(2), 303-307. https://doi.org/10.1007/s11663-009-9333-0

A numerical study of the deposition dynamics of twin-atomizer spray-forming of large-diameter billets is presented with a focus on the coupled effect of the twinatomizer scan frequency and substrate rotation frequency. The common period of the two fr... Read More about Modeling the deposition dynamics of a twin-atomizer spray forming system.

Modelling the shape and thermal dynamics of Ni superalloy rings during spray forming. Part 2 : Thermal modelling - Heat flow and solidification (2008)
Journal Article
Mi, J., & Grant, P. S. (2008). Modelling the shape and thermal dynamics of Ni superalloy rings during spray forming. Part 2 : Thermal modelling - Heat flow and solidification. Acta Materialia, 56(7), 1597-1608. https://doi.org/10.1016/j.actamat.2007.12.022

In Part 1 of this paper, a model was described to simulate the dynamic shape evolution of Ni superalloy rings during spray forming, concentrating on the effects of droplet splashing and redeposition. In this part, a companion model is presented that... Read More about Modelling the shape and thermal dynamics of Ni superalloy rings during spray forming. Part 2 : Thermal modelling - Heat flow and solidification.

Modelling the shape and thermal dynamics of Ni superalloy rings during spray forming Part 1: Shape modelling - Droplet deposition, splashing and redeposition (2008)
Journal Article
Mi, J., & Grant, P. S. (2008). Modelling the shape and thermal dynamics of Ni superalloy rings during spray forming Part 1: Shape modelling - Droplet deposition, splashing and redeposition. Acta Materialia, 56(7), 1588-1596. https://doi.org/10.1016/j.actamat.2007.12.021

A numerical model has been developed to simulate the dynamic shape evolution of Ni superalloy rings during spray forming. The model comprises: (1) a droplet primary deposition model, simulating droplet primary deposition at a deposition surface; (2)... Read More about Modelling the shape and thermal dynamics of Ni superalloy rings during spray forming Part 1: Shape modelling - Droplet deposition, splashing and redeposition.

Numerical modelling of spray formed grain size evolution (2007)
Journal Article
Mi, J. W., & Grant, P. S. (2007). Numerical modelling of spray formed grain size evolution. Materials Science Forum, 561-565(PART 3), 1991-1994. https://doi.org/10.4028/www.scientific.net/msf.561-565.1991

A numerical model has been developed to simulate the distribution of polygonal grain size in a sprayed microstructure formed from an alloy droplet spray containing a large number of solid, mushy and liquid droplets. The model takes into account the e... Read More about Numerical modelling of spray formed grain size evolution.

Multiphysics modelling of the spray forming process (2007)
Journal Article
Mi, J., Grant, P., Fritsching, U., Belkessam, O., Garmendia, I., & Landaberea, A. (2008). Multiphysics modelling of the spray forming process. Materials Science and Engineering: A, 477(1-2), 2-8. https://doi.org/10.1016/j.msea.2007.08.083

An integrated, multiphysics numerical model has been developed through the joint efforts of the University of Oxford (UK), University of Bremen (Germany) and Inasmet (Spain) to simulate the spray forming process. The integrated model consisted of fou... Read More about Multiphysics modelling of the spray forming process.

Optimisation of spray forming ni superalloys via process modelling and on-line monitoring (2007)
Journal Article
Mi, J., & Grant, P. S. (2007). Optimisation of spray forming ni superalloys via process modelling and on-line monitoring. Materials Science Forum, 546-549, 1327-1332. https://doi.org/10.4028/www.scientific.net/msf.546-549.1327

The optimisation of spray forming IN718 alloy rings for aeroengine applications was investigated using both modelling and experimental approaches. A multiphysics numerical model has been developed and implemented to assist in the optimisation of the... Read More about Optimisation of spray forming ni superalloys via process modelling and on-line monitoring.

High speed imaging study of the dynamics of ultrasonic bubbles at a liquid-solid interface
Presentation / Conference Contribution
Tan, D., & Mi, J. High speed imaging study of the dynamics of ultrasonic bubbles at a liquid-solid interface

High speed imaging, including the ultrafast synchrotron X-ray imaging facility at the beamline 32-ID-B of the Advanced Photon Source (APS), was used to study in-situ (1) the dynamics of ultrasonic bubbles inside a water suspension with an acoustic fi... Read More about High speed imaging study of the dynamics of ultrasonic bubbles at a liquid-solid interface.

Ultrafast X-ray imaging and modelling of ultrasonic cavitations in liquid metal
Presentation / Conference Contribution
Lee, T. L., Khong, J. C., Fezzaa, K., & Mi, J. Ultrafast X-ray imaging and modelling of ultrasonic cavitations in liquid metal

The dynamics of ultrasonic bubbles in liquid metal are captured in-situ for the first time using the ultrafast X-ray phase contrast imaging facility housed at the Advanced Photon Source, Argonne National Laboratory, in the USA. The experimental obser... Read More about Ultrafast X-ray imaging and modelling of ultrasonic cavitations in liquid metal.