Novel Grain Refiner for Hypo- and Hyper-Eutectic Al-Si Alloys

Abstract:

A novel effective grain refiner for hypo and hyper-eutectic Aluminium-Silicon alloys has been developed. The composition of the grain refiner has been optimized to produce a fine grain structure and finer eutectic. Effectiveness of grain size under various cooling conditions has also been investigated to simulate various practical casting conditions. For comparative purposes, a wide range of Al alloys have been produced with the addition of commercially available Al-5Ti-B master alloys. The results show that the addition of novel grain refiner reduces the grain size significantly. As a result of fine grains, the porosity in the solidified alloys is remarkably lower. A notable improvement in mechanical properties has also been observed.

• Periodical: Materials Science Forum (Volume 690)
• Pages: 49-52
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.690.49
• Online since: June 2011
• Authors: Magdalena Nowak, Nadendla Hari Babu
• Keywords: Aluminum Silicon Alloy, Grain Refinement, Nucleation

References

[1] McCartney DG. Int. Mater. Rev. 34(1989) 247

[2] E.R Rooy In: ASM International Handbook Committee, Metals handbook, Casting, 15 (1989) 743-70

[3] Granger DA. In: Welch BJ, editor. Light Metals 1998. Warrendale (PA): TMS; (1998) 941-52.

[4] J.D. Hunt, Mat. Sci. Eng. 65 (1984) 75

[5] M.A Easton, D.H. St John, Metall. Mater. Trans. 36A (2005) (1911)

[6] F. Mondolfo; Aluminum Alloys: Structure and properties (Butterworths, Boston, 1976).l

[7] D. Qiu, J.A. Taylor, M.X. Jang, P.M. Kelly, Acta Mater. 55 (2007) 1447

[8] Y.C Lee, A.K. Dahle, D.H. St John J.E.C. Hutt, Mat. Sci. Eng. A259 (1999) 43

[9] S. A. Kori, B.S. Mutty, M. Chakraborty, Mat. Sci. Eng. A283 (2000) 94

[10] J.E.C Hutt, D.H. StJohn, L. Hogan, A.K. Dahle, Mat. Sci. and Techn.15 (1999) 43-52

[11] M. Johnsson, Z Metallk. 85 (1994) 781–785