Castable Aluminium Alloys for High Temperature Applications

Abstract:

Most traditional aluminium casting alloys are based on the aluminium-silicon eutectic system because of its excellent casting characteristics. However, the solidus in this system does not exceed 577 °C and the major alloying elements used with silicon in these alloys have high diffusivity in aluminium. Therefore, while these elements enhance the room temperature strength of the alloy, they are not useful at elevated temperatures. Considering nickel-base superalloys, whose mechanical properties are retained up to temperatures that approach 75% of their melting point, it is conceivable that castable aluminium alloys can be developed on the same basis so that they are useful at temperatures approaching 300 °C. In this publication, we present the thought process behind developing a new castable aluminum alloy that is designed specifically for such high temperature applications and we present the alloy’s measured castability characteristics and its elevated temperature tensile properties.

• Periodical: Materials Science Forum (Volume 765)
• Pages: 8-12
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.765.8
• Online since: July 2013
• Authors: Yang Yang Fan, Makhlouf M. Makhlouf
• Keywords: Aluminium Alloy, Casting, High-Temperature, Nickel Aluminide, Transition Metals

References

[1] Aluminum Binary Alloy Phase Diagrams, Alloy Phase Diagrams, Vol 3, ASM Handbook, ASM International, 1992, p.2. 4-2. 56.

DOI: 10.31399/asm.hb.v03.a0006144

[2] Y.Y. Fan, MS Thesis, Precipitation Strengthening of Aluminium by Transition Metal Aluminides, Worcester Polytechnic Institute, (2012).

[3] M.S. Zedalis, M.E. Fine, Precipitation and Ostwald ripening in dilute Al Base-Zr-V alloys, Metall. Trans. A 17 (1986) 2187-2198.

DOI: 10.1007/bf02645917

[4] S. Lin, C. Aliravci, M.O. Pekguleryuz, Hot-tear susceptibility of aluminum wrought alloys and the effect of grain refining, Metall. Trans. A 38 (2007) 1056-1068.

DOI: 10.1007/s11661-007-9132-7

[5] S. Shankar, Y. Riddle, M.M. Makhlouf, Focused ion beam milling: a practical method for preparing cast Al-Si alloy samples for transmission electron microscopy, Metall. Mater. Trans. 34 (2003) 705-707.

DOI: 10.1007/s11661-003-0105-1

[6] J.M. Holt, Uniaxial Tension Testing, Mechanical Testing and Evaluation, Vol 8, ASM Handbook, ASM International, 2000, p.124–142.

[7] D. Zhao, S. Lampman, Hot Tension and Compression Testing, Mechanical Testing and Evaluation, Vol 8, ASM Handbook, ASM International, 2000, p.152–163.

DOI: 10.31399/asm.hb.v08.a0003266

[8] M. Easton, D. St John, Grain refinement of aluminium alloys: Part 1. The nucleant and solute paradigms-A review of the literature, Metall. Mater. Trans. A 30 (1999) 1613-1623.

DOI: 10.1007/s11661-999-0098-5

[9] W. Kurz, D.J. Fisher, Fundamentals of Solidification, third ed., Trans Tech Publications, Switzerland, 1992, pp.91-96.

[10] S. Yan, MS Thesis, Strengthening Aluminium by Zirconium and Chromium, Worcester Polytechnic Institute, (2013).