Abstract: A 0.005-0.020 inch thick thermoplastic sheet containing 20-80 weight percent metal alloy biocide particulate, such as 50 micron copper powder, protects submarine structures from adhesion of flora and fauna. The sheet is isotropic and inelastically deformable in the plane of the sheet. The sheet is heated to form and adhere it to the ship hulls and the like. An intermediate lower melting point film and other aids are employed in the adhering step. Heating of the sheet prior to the adhering process minimizes liberation of environmentally harmful volatiles. The sheet is removable by heating, so the material may be recycled.

Abstract: Nickel base superalloy articles, especially gas turbine disks, are provided with substantially enhanced resistance to crack growth through a specific heat treatment. The heat treatment employs a true solution treatment step followed by a subsolvus solution treatment step, followed by at least one aging step. The effect of this series of heat treatment steps is to provide a microstructure having an optimum arrangement of gamma prime particles, with respect to both size and location. Reductions in crack growth rates of several hundred percent relative to prior art heat treatments are achieved.

Abstract: A series of superalloy compositions are described, which when processed according to a described processing sequence, produce homogeneous superalloy articles which contain an exceptionally high amount of the gamma prime phase. These alloys contain large amounts of aluminum and chromium and hence are quite oxidation resistant. The processing sequence includes rapid solidification to suppress the formation of the low melting eutectic phases which would otherwise occur.

Abstract: The constitutionally complex alloys, particularly those exhibiting good high temperature strength and prone to the development of unacceptable heterogeneity in conventional casting operations, are produced by consolidation of a cold-worked particulate material which is sized to preclude the development thereon, in the time span at temperature used in consolidation, of undesirable surface phases such as carbides which inhibit particulate bonding.