Publications
162 results found
Belyakov SA, Gourlay CM, 2015, NiSn<sub>4</sub> in Solder Joints Between Sn-3.5Ag and Ni, ENIG or ENEPIG, IEEE 65th Electronic Components and Technology Conference (ECTC), Publisher: IEEE, Pages: 1273-1279, ISSN: 0569-5503
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- Citations: 2
Morita S, Yasuda H, Nagira T, et al., 2015, Application of a macroscopic model to predict the band segregation induced by shear deformation of semisolid, 14th International Conference on Modeling of Casting, Welding and Advanced Solidification Processes (MCWASP), Publisher: IOP PUBLISHING LTD, ISSN: 1757-8981
Nagira T, Morita S, Yasuda H, et al., 2015, Localization of shear strain and shear band formation induced by deformation in semi-solid Al-Cu alloys, 14th International Conference on Modeling of Casting, Welding and Advanced Solidification Processes (MCWASP), Publisher: IOP PUBLISHING LTD, ISSN: 1757-8981
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- Citations: 1
Xian JW, Belyakov SA, Britton TB, et al., 2015, Heterogeneous Nucleation of Bulk Cu<sub>6</sub>Sn<sub>5</sub> in Sn-Ag-Cu-Al and Sn-Cu-Al Solders, IEEE 65th Electronic Components and Technology Conference (ECTC), Publisher: IEEE, Pages: 2241-2247, ISSN: 0569-5503
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- Citations: 1
Nagira T, Morita S, Yokota H, et al., 2014, <i>In Situ</i> Observation of Deformation in Semi-solid Fe-C Alloys at High Shear Rate, METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, Vol: 45A, Pages: 5613-5623, ISSN: 1073-5623
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- Citations: 16
Kareh KM, Lee PD, Atwood RC, et al., 2014, Pore behaviour during semi-solid alloy compression: Insights into defect creation under pressure, SCRIPTA MATERIALIA, Vol: 89, Pages: 73-76, ISSN: 1359-6462
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- Citations: 13
Pandee P, Gourlay CM, Belyakov SA, et al., 2014, Eutectic Morphology of Al-7Si-0.3Mg Alloys with Scandium Additions, METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, Vol: 45A, Pages: 4549-4560, ISSN: 1073-5623
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- Citations: 35
Gourlay CM, O'Sullivan C, Fonseca J, et al., 2014, Synchrotron Radiography Studies of Shear-Induced Dilation in Semisolid Al Alloys and Steels, JOM, Vol: 66, Pages: 1415-1424, ISSN: 1047-4838
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- Citations: 11
Kareh KM, Lee PD, Atwood RC, et al., 2014, Revealing the micromechanisms behind semi-solid metal deformation with time-resolved X-ray tomography, Nature Communications, Vol: 5, Pages: 1-7, ISSN: 2041-1723
The behaviour of granular solid–liquid mixtures is key when deforming a wide range of materials from cornstarch slurries to soils, rock and magma flows. Here we demonstrate that treating semi-solid alloys as a granular fluid is critical to understanding flow behaviour and defect formation during casting. Using synchrotron X-ray tomography, we directly measure the discrete grain response during uniaxial compression. We show that the stress–strain response at 64–93% solid is due to the shear-induced dilation of discrete rearranging grains. This leads to the counter-intuitive result that, in unfed samples, compression can open internal pores and draw the free surface into the liquid, resulting in cracking. A soil mechanics approach shows that, irrespective of initial solid fraction, the solid packing density moves towards a constant value during deformation, consistent with the existence of a critical state in mushy alloys analogous to soils.
Belyakov SA, Gourlay CM, 2014, Heterogeneous nucleation of βSn on NiSn4, PdSn4 and PtSn4, Acta Materialia, Vol: 71, Pages: 56-68, ISSN: 1873-2453
During Pb-free soldering, βSn often requires a high nucleation undercooling and there is an ongoing effort to develop nucleation catalysts. It is shown here that NiSn4, PdSn4 and PtSn4 are heterogeneous nucleants for βSn, reducing the nucleation undercooling to ∼4 K when these intermetallics are present either in the bulk solder or as the interfacial layer. Nucleation catalysis occurs by βSn nucleating on the (0 0 8) facet of XSn4 crystals with an orientation relationship (OR) (1 0 0)Sn||(0 0 8)XSn4 and [0 0 1]Sn||[1 0 0]XSn4 where there is a planar lattice match of ∼5%. This OR is also the origin of well-aligned lamellar βSn–XSn4 eutectic morphologies, even though the eutectics contain less than 2 vol.% of faceted NiSn4, PdSn4 or PtSn4.
Zeng G, Mcdonald SD, Gourlay CM, et al., 2014, Solidification of Sn-0.7Cu-0.15Zn Solder: <i>In Situ</i> Observation, METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, Vol: 45A, Pages: 918-926, ISSN: 1073-5623
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- Citations: 21
Nogita K, Gourlay CM, McDonald SD, et al., 2013, XRD study of the kinetics of transformations in tin, PHILOSOPHICAL MAGAZINE, Vol: 93, Pages: 3627-3647, ISSN: 1478-6435
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- Citations: 26
Belyakov SA, Gourlay CM, 2013, Role of Fe impurities in the nucleation of metastable NiSn<sub>4</sub>, INTERMETALLICS, Vol: 37, Pages: 32-41, ISSN: 0966-9795
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- Citations: 13
Fonseca J, O'Sullivan C, Nagira T, et al., 2013, In situ study of granular micromechanics in semi-solid carbon steels, ACTA MATERIALIA, Vol: 61, Pages: 4169-4179, ISSN: 1359-6454
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- Citations: 34
Nagira T, Yokota H, Morita S, et al., 2013, Characterization of Shear Deformation Based on In-situ Observation of Deformation in Semi-Solid Al-Cu Alloys and Water-Particle Mixture, TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN, Vol: 99, Pages: 141-148, ISSN: 0021-1575
Nishimura T, Nogita K, McDonald SD, et al., 2013, A process for producing solder joints with greater reliability, WO 2013002112 A1
Kareh KM, Lee PD, Gourlay CM, 2013, Globule-globule interactions during deformation in semi-solid Al-Cu using time-resolved X-ray tomography, 12th International Conference on Semi-Solid Processing of Alloys and Composites (S2P 2012), Publisher: TRANS TECH PUBLICATIONS LTD, Pages: 179-+, ISSN: 1012-0394
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- Citations: 2
Nagira T, Yokota H, Morita S, et al., 2013, Characterization of Shear Deformation Based on In-situ Observation of Deformation in Semi-solid Al-Cu Alloys and Water-particle Mixture, ISIJ INTERNATIONAL, Vol: 53, Pages: 1195-1201, ISSN: 0915-1559
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- Citations: 17
Gourlay CM, Nagira T, Uesugi K, et al., 2013, In-situ study of the altering globule packing-density during semisolid alloy deformation, 12th International Conference on Semi-Solid Processing of Alloys and Composites (S2P 2012), Publisher: TRANS TECH PUBLICATIONS LTD, Pages: 185-+, ISSN: 1012-0394
Belyakov SA, Gourlay CM, 2012, NiSn<sub>4</sub> Formation in As-Soldered Ni-Sn and ENIG-Sn Couples, JOURNAL OF ELECTRONIC MATERIALS, Vol: 41, Pages: 3331-3341, ISSN: 0361-5235
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- Citations: 18
Belyakov SA, Gourlay CM, 2012, NiSn<sub>4</sub> formation during the solidification of Sn-Ni alloys, INTERMETALLICS, Vol: 25, Pages: 48-59, ISSN: 0966-9795
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- Citations: 40
Yuan L, O'Sullivan C, Gourlay CM, 2012, Exploring dendrite coherency with the discrete element method, ACTA MATERIALIA, Vol: 60, Pages: 1334-1345, ISSN: 1359-6454
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- Citations: 37
Yuan L, O'Sullivan C, Gourlay CM, 2012, Numerical study of dendrite coherency during equiaxed solidification by the Discrete Element Method, 13th International Conference on Modeling of Casting, Welding and Advanced Solidification Processes (MCWASP), Publisher: IOP PUBLISHING LTD, ISSN: 1757-8981
Morita S, Yasuda H, Nagira T, et al., 2012, Macroscopic modelling of semisolid deformation for considering segregation bands induced by shear deformation, MCWASP XIII: INTERNATIONAL CONFERENCE ON MODELING OF CASTING, WELDING AND ADVANCED SOLIDIFICATION PROCESSES, Vol: 33, ISSN: 1757-8981
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- Citations: 3
Gourlay CM, Nagira T, Dahle AK, et al., 2012, Synchrotron radiography of direct-shear in semi-solid alloys, 3rd International Conference on Advances in Solidification Processes, Publisher: IOP PUBLISHING LTD, ISSN: 1757-8981
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- Citations: 8
Kareh KM, Lee PD, Gourlay CM, 2012, <i>In situ</i>, time-resolved tomography for validating models of deformation in semi-solid alloys, 13th International Conference on Modeling of Casting, Welding and Advanced Solidification Processes (MCWASP), Publisher: IOP PUBLISHING LTD, ISSN: 1757-8981
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- Citations: 7
Nogita K, Gourlay CM, McDonald SD, et al., 2011, Kinetics of the η-η′ transformation in Cu<sub>6</sub>Sn<sub>5</sub>, SCRIPTA MATERIALIA, Vol: 65, Pages: 922-925, ISSN: 1359-6462
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- Citations: 64
Otarawanna S, Gourlay CM, Laukli HI, et al., 2011, Formation of the surface layer in hypoeutectic Al-alloy high-pressure die castings, MATERIALS CHEMISTRY AND PHYSICS, Vol: 130, Pages: 251-258, ISSN: 0254-0584
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- Citations: 18
Gourlay CM, Dahle AK, Nagira T, et al., 2011, Granular deformation mechanisms in semi-solid alloys, ACTA MATERIALIA, Vol: 59, Pages: 4933-4943, ISSN: 1359-6454
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- Citations: 72
Nagira T, Gourlay CM, Sugiyama A, et al., 2011, Direct observation of deformation in semi-solid carbon steel, SCRIPTA MATERIALIA, Vol: 64, Pages: 1129-1132, ISSN: 1359-6462
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- Citations: 67
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