Pack aluminisation kinetics of nickel rods and foams

David C Dunand*, A. M. Hodge, C. Schuh

*Corresponding author for this work

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

The kinetics of pack aluminisation has been described through a multiphase, finite difference model considering diffusion of aluminium into nickel under conditions of concentration dependent diffusivity and finite specimen dimensions, allowing complete conversion of the specimen to the equilibrium intermetallic phase. For a cylindrical geometry, the model accurately predicts the growth of an outer Ni2Al3 shell, the increase in diameter, and the average composition as measured for 0.5 and 1 mm diameter nickel rods aluminised at 1000°C for up to 4 h. For nickel foams with hollow struts, which are modelled as thin sheets, good agreement is found with the average aluminium concentration measured on two foams with strut wall thicknesses of 41 and 84 μm. The measured aluminisation kinetics for a foam with strut thickness of 6 μm, however, is much slower than predicted owing to the high surface area of this foam, which prevents the centre of the specimen from reaching the equilibrium aluminium surface concentration.

Original languageEnglish (US)
Pages (from-to)326-332
Number of pages7
JournalMaterials Science and Technology
Volume18
Issue number3
DOIs
StatePublished - Mar 1 2002

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

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