Method of bonding aluminum alloy materials to each other

A method of bleed bonding two members directly to each other without a filler material wherein one of said members to be bonded consists of an aluminum alloy material, and wherein the other member to be bonded consists of either an aluminum alloy material or a pure aluminum material, the method comprising the steps of:

• providing the aluminum alloy material defined as said one member such that it contains Mg falling within a range from 0.2 mass % to 2.0 mass %, and such that it does not contain whiskers or granules of a reinforcing material selected from the group consisting of Al2O3, SiC, Si3N4, TiC, and AlN;
• providing the material defined as said other member such that it does not contain more than 2.0 mass % Mg, and such that it does not contain whiskers or granules of a reinforcing material selected from the group consisting of Al2O3, SiC, Si3N4, TiC, and AlN;
• engaging the two members together without any flux provided between the two members;
• and
• carrying out a bleed bonding process in either a vacuum environment or a non-oxidizing atmosphere at a temperature, at which a ratio of a mass of liquid phases generated in the aluminum alloy material defined as said one member to the total mass of the aluminum alloy material of said one member falls within a range from 5% to 35%, whereby a clearance between the two members is filled with the liquid phases generated in the aluminum alloy material defined as said one member or with liquid phases generated in both of the two members such that a bond junction formed between the two members involves the metal structures of the two members only.