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Modelling the formation of ordered porous structure (GASAR)

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Presentation on theme: "Modelling the formation of ordered porous structure (GASAR)"— Presentation transcript:

1 Modelling the formation of ordered porous structure (GASAR)
Professor of Materials Science September 2009

2 Queen’s University Belfast Crest; Coat of Arms; Emblem

3 Queen’s University Belfast Lanyon Building

4 Techniques for production Schematic representation of a gasar growth unit

5 Techniques for production (a) porosity 32.6% (b) porosity 44.7%
Gasars: a class of metallic materials with ordered porosity. 22, 2006, 1135.

6 Techniques for production Scheme of continuous zone melting technique

7 Porosity and pore characteristics Relationship between pore size and porosity
4 100 80 60 40 20 Porosity, % Pore size, μm 1 2 5 3 irradiation-induced pores sintered powders sintered fibers foamed metals gasars

8 Gasar properties Stress-strain curves for solid and gasar coppers

9 Heat transfer Gas diffusion in liquid: on solid/melt interface: Random processes at structure formation nucleation: ranges of size Simultaneous solid and gas phase growth T & gas; nucleation; growth Acta Materialia, 55, 2007, 6459

10 Model features Many structure and ingot characteristics obtained
temperature distribution in the melt and in the porous ingot local solidification velocity pore direction gas distribution in the melt local porosity average ingot porosity number of pores per unit area position of a nucleus and closing of pores average pore diameter in transverse cross section

11 Model features Simulations without change of input parameters

12 Model features Simulations without change of input parameters

13 Model features Changes of partial gas pressure
PH2 PH2+PAr

14 Model features Change in structure

15 Model features Change in structure

16 Comparison with experiments Pore size distribution
rg μ rs Modelling and Simulation in Materials Science and Engineering, 14, 2006, 663

17 Prognostic capabilities Gas distribution in melt on solid/melt interface

18 Prognostic capabilities Structure for different number of nucleation sites
1 10 100

19 Prognostic capabilities Structure for different number of nucleation sites
1 10 100

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