Aluminum alloy for casting having high rigidity and low linear expansion coefficient

Abstract

[Objectives] An aluminum alloy for casting with excellent rigidity and having a low coefficient of linear expansion, and at the same time, does not have a high cost, and has a few restrictions at the time of recycling. [Means for Achieving Objectives] An aluminum alloy for casting with excellent rigidity and having a low coefficient of linear expansion containing 13-25% by mass of silicon, 2-8% by mass of copper, 0.5-3% by mass of iron, 0.3-3% by mass of manganese, 0.001-0.02% by mass of phosphorus, and the remainder comprising aluminum and inevitable impurities, wherein the total amount of iron and manganese is 3.0% by mass or greater. Said alloy may further contain 0.5-6% by mass of nickel, and the total amount of iron, manganese, and nickel may be 3.0% by mass or greater. Further, said alloy may further contain one or more of 0.1-1.0% by mass of chromium, 0.05-1.5% by mass of magnesium, 0.01-1.0% by mass of titanium, 0.0001-1.0% by mass of boron, 0.1-1.0% by mass of zirconium, 0.1-1.0% by mass of vanadium, or 0.01-1.0% by mass of molybdenum.

1 . An aluminum alloy consisting of 13-25% by mass of silicon, 2-8% by mass of copper, 0.5-3% by mass of iron, 0.3-3.5% by mass of manganese, 0.001-0.02% by mass of phosphorus, and one or more of 0.1-1.0% by mass of Cr or 0.05-1.5% by mass of Mg, and the remainder, which consists of aluminum and inevitable impurities, wherein the total amount of iron and manganese is 3.0% by mass or greater, said aluminum alloy having a Young's modulus of 90 GPa or more and a coefficient of linear thermal expansion of 18×10 −6 /° C. or less. 
     
     
         2 . An aluminum alloy consisting of 13-25% by mass of silicon, 2-8% by mass of copper, 0.5-3% by mass of iron, 0.3-3.5% by mass of manganese, 0.001-0.02% by mass of phosphorus, and one or more of 0.01-1.0% by mass of titanium, 0.0001-1.0% by mass of boron, 0.1-1.0% by mass of zirconium, 0.1-1.0 by mass of vanadium, and 0.01-1.0% by mass of molybdenum, and the remainder, which consists of aluminum and inevitable impurities, wherein the total amount of iron and manganese is 3.0% by mass or greater, said aluminum alloy having a Young's modulus of 90 GPa or more and a coefficient of linear thermal expansion of 18×10 −6 /° C. or less. 
     
     
         3 . An aluminum alloy consisting of 13-25% by mass of silicon, 2-8% by mass of copper, 0.5-3% by mass of iron, 0.3-3.5% by mass of manganese, 0.5-6% by mass of nickel, 0.001-0.02% by mass of phosphorus, and one or more of 0.1-1.0% by mass of Cr or 0.05-1.5% by mass of Mg, and the remainder, which consists of aluminum and inevitable impurities, wherein the total amount of iron and manganese is 3.0% by mass or greater, said aluminum alloy having a Young's modulus of 90 GPa or more and a coefficient of linear thermal expansion of 18×10 −6 / ° C. or less. 
     
     
         4 . An aluminum alloy consisting of 13 - 25% by mass of silicon, 2-8% by mass of copper, 0.5-3% by mass of iron, 0.3-3.5% by mass of manganese, 0.5-6% by mass of nickel, 0.001-0.02% by mass of phosphorus, and one or more of 0.01-1.0% by mass of titanium, 0.0001-1.0% by mass of boron, 0.1-1.0% by mass of zirconium, 0.1-1.0 by mass of vanadium, and 0.01-1.0% by mass of molybdenum, and the remainder, which consists of aluminum and inevitable impurities, wherein the total amount of iron and manganese is 3.0% by mass or greater, said aluminum alloy having a Young's modulus of 90 GPa or more and a coefficient of linear thermal expansion of 18×10 −6 /° C. or less. 
     
     
         5 . The aluminum alloy according to  claim 1 , wherein the amount of manganese is 1-3% by mass. 
     
     
         6 . The aluminum alloy according to  claim 2 , wherein the amount of manganese is 1-3% by mass. 
     
     
         7 . The aluminum alloy according to  claim 3 , wherein the amount of manganese is 1-3% by mass. 
     
     
         8 . The aluminum alloy according to  claim 4 , wherein the amount of manganese is 1-3% by mass. 
     
     
         9 . The aluminum alloy according to  claim 3 , wherein the total amount of iron, manganese and nickel is 3.0% by mass or greater. 
     
     
         10 . The aluminum alloy according to  claim 4 , wherein the total amount of iron, manganese and nickel is 3.0% by mass or greater. 
     
     
         11 . The aluminum alloy according to  claim 3 , wherein the amount of nickel is 1-6% by mass. 
     
     
         12 . The aluminum alloy according to  claim 4 , wherein the amount of nickel is 1-6% by mass. 
     
     
         13 . The aluminum alloy according to  claim 3 , wherein the amount of nickel is 1-3% by mass. 
     
     
         14 . The aluminum alloy according to  claim 4 , wherein the amount of nickel is 1-3% by mass.