Journal of Materials Science

, Volume 42, Issue 18, pp 7894–7898 | Cite as

A novel approach to produce Al-alloy foams



The stability of Al foams during processing is crucial to producing uniform Al foams. Once pores form during processing, no matter which conventional methods are used, the pores grow and/or merge into large ones, which could cause Al foams to “collapse”. Therefore, it has attracted great attention of researchers to enhance the stability of Al foams during processing for improved quality of Al foams. A novel approach to produce Al-alloy foams, “Rheofoaming”, is presented in this paper. A twin-screw rheomixer fitted with a gas inlet near the end cap is used in this work. The mechanism of this approach is firstly to increase the viscosity of semisolid slurry of Al alloy by adding sub-micron Al2O3 particles and then to mix N2 gas with the semisolid slurry using a twin-screw rheomixer, which can offer high shear rate and intensive turbulence. The gas pores in the semisolid slurry are stretched and broken into smaller ones in the rheomixer. Al foams are very stable during the processing due to small pore sizes and high viscosity of semisolid slurry. The microstructure of rheofoamed Al foams and the process of this new approach have been described in this paper.


Foam High Shear Rate Ceramic Particle A380 Alloy Al2O3 Particle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


  1. 1.
    Ramamurty U, Paul A (2004) Acta Mater 52:869CrossRefGoogle Scholar
  2. 2.
    Kozaa E, Leonowicza M, Wojciechowskia S, Simancik F (2003) Mater Lett 58:132CrossRefGoogle Scholar
  3. 3.
    Lehmhus D, Banhart J (2003) Mater Sci Eng A349:98Google Scholar
  4. 4.
    Simančík F (1999) In: Banhart J, Ashby MF, Fleck NA (eds) Metal foams and porous metal structures. MIT-Verlag, Bremen, p 235Google Scholar
  5. 5.
    Banhart J (2001) Prog Mater Sci 46:559CrossRefGoogle Scholar
  6. 6.
    Jin I, Kenny LD, Sang H (1990) US Patent 4,973,358 (Int. Patent Application WO 91/03578)Google Scholar
  7. 7.
    Jin I, Kenny LD, Sang H (1992) US Patent 5,112,697Google Scholar
  8. 8.
    Ruch W, Kirkevag B (1991) Int. Patent Application WO 91/01387 (European Patent Application EP0, 483, 184, B1)Google Scholar
  9. 9.
    Weber J (1986) German Patent Application 3,516,737Google Scholar
  10. 10.
    Song ZL, Ma LQ, Wu ZJ, He DP (2000) J Mater Sci 35:15CrossRefGoogle Scholar
  11. 11.
    Kenny LD, Thomas M (1994) Int. Patent Application WO 94/09931Google Scholar
  12. 12.
    Fan Z, Ji S, Zhang J (2001) Mater Sci Techn 17:837CrossRefGoogle Scholar
  13. 13.
    Fang X, Fan Z (2005) Mater Sci Techn 21:366CrossRefGoogle Scholar
  14. 14.
    Fang X, Fan Z (2006) Scripta Mater 54:789CrossRefGoogle Scholar
  15. 15.
    Fan Z, Fang X, Ji S (2005) Mater Sci Eng 412A:298Google Scholar
  16. 16.
    Prakash O, Embury JD, Sang H, Sinclair C, Silvetti P (1997) In: Ward-Close CM, Froes FH, Chellman DJ, Cho SS (eds) Synthesis/processing of light-weight metallic materials II. The Minerals, Metals and Materials Society, p 19Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.BCASTBrunel UniversityUxbridgeUK

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