A method for joining an aluminum material includes, in the following order, arranging a first wrought aluminum alloy material along a first jig in an internal space defined between the first jig and a second jig that is arranged to face the first jig and has a pouring port, pouring molten aluminum toward the first wrought aluminum alloy material through the pouring port under pressure to cause the molten aluminum to collide with a surface of the first wrought aluminum alloy material, thereby digging down the first wrought aluminum alloy material at a collision position between the molten aluminum and the first wrought aluminum alloy material, and flowing the molten aluminum together with a fraction of the first wrought aluminum alloy material removed by digging within the internal space along a surface of the first wrought aluminum alloy material around the collision position.

New aluminum casting (foundry) alloys are disclosed. The new aluminum casting alloys may include from 6.0 to 11.5 wt. % Si, from 0.30 to 0.80 wt. % Fe, optionally from 0.07 to 0.20 wt. % of X, wherein X is selected from the group consisting of Mg, Mo, Zr, and combinations thereof, and optionally 100-500 ppm Sr, the balance being aluminum and unavoidable impurities. The new aluminum casting alloys may be high-pressure die cast into complex shapes. The new aluminum casting alloys may be useful, for instance, in heat sink/antenna applications.

Provided are: a metal composite material in which a metal material and an aluminum casting are integrated with one another so as to exhibit high adhesion strength; and a method for producing the same. The metal composite material has a metal material and an aluminum casting which is layered on the metal material. Projecting alloy sections of the metal material which have a higher melting point than does the aluminum casting are formed on the surface of the metal material. The aluminum casting covers the surface of the metal material and is tightly adhered to the projecting alloy sections.

Provided are: a metal composite material in which a metal material and an aluminum casting are integrated with one another so as to exhibit high adhesion strength; and a method for producing the same. The metal composite material has a metal material and an aluminum casting which is layered on the metal material. Projecting alloy sections of the metal material which have a higher melting point than does the aluminum casting are formed on the surface of the metal material. The aluminum casting covers the surface of the metal material and is tightly adhered to the projecting alloy sections.

An aluminum alloy based on a total weight of the aluminum alloy, in percentages by weight, includes 9.12% of Si, 8-11% of Zn, 0.5-1.5% of Mg, 0.2-0.8% of Cu, 0-0.6% of Fe, 0.08-0.25% of Mn, 0-0.10% of Sr, 0-0.05% of Sc, 0-0.5% of Er, and 73.2-82.22% of Al.

An aluminum alloy based on a total weight of the aluminum alloy, in percentages by weight, includes 9.12% of Si, 8-11% of Zn, 0.5-1.5% of Mg, 0.2-0.8% of Cu, 0-0.6% of Fe, 0.08-0.25% of Mn, 0-0.10% of Sr, 0-0.05% of Sc, 0-0.5% of Er, and 73.2-82.22% of Al.

A high-strength thin-gauge checkered steel plate/strip and a manufacturing method therefor, wherein residual elements such as Sn and Cu in steel scrap are fully utilized as alloy elements in the smelting of molten steel, and the steel has selectively added micro-alloy elements such as B; during the smelting process, the alkalinity of the slag, the types of inclusion in the steel and the melting point thereof, the content of free oxygen and the content of soluble aluminum (Als) in the molten steel are controlled; and twin-roll thin-strip continuous casting is performed to cast a cast strip (11); after exiting crystallization rollers (8a, 8b), the cast strip (11) directly enters a lower sealed chamber (10) containing a non-oxidizing atmosphere, and enters an online rolling machine (13) in a sealed manner so as to undergo hot rolling, then after rolling, the strip steel is cooled by means of air atomization. The resultant steel roll can be used directly as hot-rolled checkered plate/strip, or as a finished checkered plate/strip after being cut and finished, and is widely applicable to the fields of architecture, mechanical production, automobile, bridges, transportation, ship building, etc.

Provided is an aluminum alloy diecast that can be unlikely to crack at a part to be press-fitted while the proof stress of a main body part is being secured, and can eliminate the need for heat treatment to the main body part at the time of production. The aluminum alloy diecast (11) includes a part to be press-fitted (13) into which a joining member (20) is press-fitted and a main body part (14) in which the part to be press-fitted (13) is integrally formed, in which an average hardness of the part to be press-fitted (13) is lower than an average hardness of the main body part (14) or an average roundness of crystals other than a primary crystal of Al in the part to be press-fitted (13) is larger than an average roundness of crystals other than a primary crystal of Al in the main body part (14).

An injection device of a light metal injection molding machine of the disclosure includes: a melting cylinder that heats and melts a billet pushed along a cylinder hole and stores molten metal; an injection cylinder that injects, by an inserted plunger, the molten metal supplied by free fall due to the own weight from the melting cylinder through a communication path that can be opened and closed; and a molten metal pot in which a molten metal supply/discharge port connected to the melting cylinder is opened at a location in the melting cylinder that does not face an opening of the communication path on the melting cylinder side, and molten metal in an amount in excess of a capacity that can be stored in the melting cylinder is stored.

An injection device of a light metal injection molding machine of the disclosure includes: a melting cylinder that heats and melts a billet pushed along a cylinder hole and stores molten metal; an injection cylinder that injects, by an inserted plunger, the molten metal supplied by free fall due to the own weight from the melting cylinder through a communication path that can be opened and closed; and a molten metal pot in which a molten metal supply/discharge port connected to the melting cylinder is opened at a location in the melting cylinder that does not face an opening of the communication path on the melting cylinder side, and molten metal in an amount in excess of a capacity that can be stored in the melting cylinder is stored.