Metal treatment – Process of modifying or maintaining internal physical... – With casting or solidifying from melt
Patent
1992-05-21
1993-06-08
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
With casting or solidifying from melt
148417, 148439, 420535, 420544, 420549, C22F 104
Patent
active
052175464
ABSTRACT:
A cast hypereutectic Al-Si alloy with from 12-15% Si, having excellent wear resistance and machinability, improved fatigue strength and good levels of ambient and elevated temperature properties is provided, as well as a method of producing such alloy. The alloy and a melt used in the method contains Sr in excess of 0.10% and Ti in excess of 0.005%, the alloy further comprising: Cu 1.5 to 5.5%, Ni 1.0 to 3.00%, Mg 0.1 to 1.0%, Fe 0.1 to 1.0%, Mn 0.1 to 0.8%, Zr 0.01 to 0.1%, Zn 0 to 3.0%, Sn 0 to 0.2%, Pb 0 to 0.2%, Cr 0 to 0.1%, Na 0 to 0.01%, B (elemental) 0.05% maximum, Ca 0.003% maximum, P 0.003% maximum. Others 0.05 maximum each, the balance, apart from incidental impurities, being Al. The level of Sr in excess of 0.10% and Ti in excess of 0.005% is such that the alloy has a microstructure in which any primary Si formed is substantially uniformly dispersed and is substantially free of segregation, and in which substantially uniformly dispersed Sr intermetallic particles are present but are substantially free of such particles in the form of platelets, with the microstructure predominantly comprising a eutectic matrix.
REFERENCES:
patent: 4068645 (1978-01-01), Jenkinson
patent: 4434014 (1984-02-01), Smith
patent: 4786340 (1988-11-01), Ogawa et al.
Chemical and Physical Characteristics of Molten Aluminum, Chapter 3, Aluminum Casting Technology, American Foundryman's Society Inc., 1986, pp. 28-30.
ASM Metals Handbook, vol. 15, Castings, 9th Edition, 1988, pp. 751-752.
ASM Metals Handbook, vol. 15, Castings, 9th Edition, 1988, p. 164.
P. Davami, et al., Strontium as a Modifying Agent for Al-Si Eutectic Alloy, British Foundryman, 72(4), 1979, pp. 4-7
B. Closset, et al., A356.0 Alloys Modified with Pure Strontium, AFS Transactions, 1982, pp. 453-464.
J. E. Gruzleski, et al., Strontium Addition to Al-Si Alloy Melts, Proceedings of Conference on Solidification Processing, Sheffield University, 1987, pp. 52-54.
Eady John A.
Heathcock Christopher J.
Kean Peter L.
Legge Rodney A.
Rogers Kevin P.
Comalco Aluminum Limited
Dean R.
Koehler Robert R.
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