Abstract: A plurality of blanks divided at a division end face 5 or a blank-bonded product comprising a plurality of blanks sintered and bonded together are or is compressed in the same mold, so that they are plastically deformed until the division end faces 5 are cohered. Thereafter, a load is applied to the plastically worked product in a direction of breaking of the division end faces 5 to break the division end faces 5 and divide the plastically worked product into a plurality of members. In this manner, a split type mechanical part having irregularities meshed with each other on mating faces and easily positionable relative to each other can be produced with a good dimentional accuracy.

Abstract: A aluminum alloy in the form of bulk includes an aluminum matrix and carbon particles having an average particle size of 100 nm or less and dispersed in the aluminum matrix in an amount of 1 to 40 atomic % with respect to the total atoms constituting the aluminum alloy. The aluminum alloy is produced by preparing a raw material comprising aluminum and carbon as components and forming an aluminum alloy by inserting the raw material into a cavity formed by a set of dies and applying repeatedly plastic deformation to the raw material while maintaining the temperature of the raw material in the range of from 100 to 400.degree. C.

Abstract: An improved windsurfing spreader having at least one pulley mounted thereon to rotatably engage the harness line and mounted in a manner to facilitate disengagement of the harness line from the pulley, when desired, and which is very light in weight and which is strong enough and rigid enough to withstand the stresses of windsurfing, yet which is sufficiently flexible to provide a shock-absorbing function to prevent injury to the surfer.

Abstract: A method is disclosed for scribing chemical milling maskant applied to a metal substrate by impinging a laser beam on the maskant and controlling the beam to penetrate through the maskant substantially without damaging the underlying metal. In carrying out the process, a metal part such as aluminum, titanium or their alloys is coated with an organic polymer maskant having absorption to a laser beam, a predetermined pattern is scribed in the maskant by impinging a laser beam, e.g. a Nd:YAG (neodymium doped yttrium aluminum garnet) laser, under controlled conditions to scribe a predetermined pattern in the maskant and substantially without damaging the underlying metal, removing the maskant portion within the circumscribed area of the pattern to expose the underlying metal and leaving the remaining maskant portion adhered to the substrate, immersing the metal substrate in a chemical milling solution, e.g.

Abstract: An aluminum torpedo piston is provided with a piston head fabricated from a etal matrix composite material composed of aluminum and silicon carbide fibers that are integrally joined by an inertial welding technique. A 23% weight of silicon carbide fibers to powdered aluminum was selected. Resistance to intense heating which would otherwise cause melting and erosion of the piston is avoided to permit longer, high speed runs.

Abstract: The reinforcement of the crown of a piston of aluminum or aluminum alloy for an internal combustion engine comprises the preparation of a reinforcement member (10, 13) which is provided with apertures (11, 14), or reentrants. The reinforcement member is placed in a crown-forming part (18) of a piston die in a squeeze casting apparatus and the piston is squeeze cast. The molten metal penetrates the apertures, or enters the reentrants, and these are so shaped that when the molten metal has solidified, keys are formed which connect securely the reinforcement member to the aluminum or aluminum alloy. Further reinforcement members can then be readily brazed or welded to the first reinforcement member.

Abstract: A method of bonding a metallic object to another object includes scatter coating an aluminum containing metal on the surface of the metallic object, after cleaning the surface, and bonding the metallic object to the other object with an adhesive. Where both objects are metallic, the surfaces to be bonded are each scatter coated with aluminum. The scatter coating can be formed by friction coating aluminum containing metal onto each metal surface to be bonded.