Internal-combustion engines – Particular piston and enclosing cylinder construction – Piston
Patent
1991-12-05
1992-05-26
Cross, E. Rollins
Internal-combustion engines
Particular piston and enclosing cylinder construction
Piston
92222, 420529, 420535, 420590, 148416, 148549, C22F 104, C22C 2112, F02F 300
Patent
active
051157705
ABSTRACT:
An aluminum casting alloy consisting of, by weight, of 7.0-13.0% copper, 0.4-1.2% manganese, 0.21-0.40% vanadium, 0.31-0.70% zirconium; impurities limited to: less than to 0.6% Si, less than 0.8% Fe, less than 0.2% zinc, less than 0.1% Mn, less than 0.2% Ni, and the remainder being essentially aluminum. There is an absence of titanium, cobalt, molybdenum, tungsten, chromium, boron, tantalum, and niobium. The alloy has, at room temperature, a UTS of about 61 ksi, a YS of about 49 ksi, a tensile elongation of about 6%, and tensile modulus elasticity of about 11.5 MSi, a compressive yield strength of about 53 ksi, a compressive modulus of elasticity of about 18 MSi; high temperature physical properties at 500.degree. F., after 1000 hours exposure to 500.degree. F., comprise a tensile strength of 33 ksi or greater, a tensile yield strength of 23 ksi or greater, a tensile elongation of about 9%, and tensile modulus of elasticity of 10 msi. The alloy is fabricated by a) squeeze casting an aluminum alloy melt of such character; (b) extracting the solidified casting from the die and heat treating the casting to dissolve all alloying elements (i.e., 995.degree.-1018.degree. F. for 7-20 hours); and (c) aging the solution treated casting to achieve improved strength characteristics (i.e., in the range of 340.degree.-400.degree. F. for 5-20 hours).
REFERENCES:
patent: 4643079 (1987-02-01), Brann et al.
patent: 4706550 (1987-11-01), Bullat
patent: 4807577 (1989-02-01), Koutsoupidis
Evans Walter J.
Yen Chia M.
Cross E. Rollins
Ford Motor Company
Macy M.
Malleck Joseph W.
May Roger L.
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