Abstract: Method and apparatus for compaction of powder of high density boron nitride, having an initial particle diameter of at least two microns, into a high density crystal aggregate of between 1 mm up to about 1 cm in diameter, the resulting crystal aggregate having a zincblende form, the wurtzite form or mixtures of the zincblende and wurtzite forms. High density aggregates of boron nitride, preferably having particle sizes with diameters at least 2 .mu.m, are placed in a hollow, substantially cylindrical first container of metal, and the first container is surrounded by a fluid-like material of metal or metal powder having a shock wave velocity V. The first container and fluid-like material are placed in a substantially cylindrical second container that is purged of substantially all air and sealed. The second container has a rigid side wall and two rigid end walls.

Abstract: A method for synthesizing low density cermets of boron carbide and a metal binder, using decomposition of a metallic compound at controlled temperature and pressure.

Abstract: Amorphous metal powders or ribbons are fabricated into solid shapes of appreciable thickness by the application of compaction energy. The temperature regime wherein the amorphous metal deforms by viscous flow is measured. The metal powders or ribbons are compacted within the temperature range.

Abstract: Metal alloy filaments having improved surface characteristics and enhanced mechanical properties are extracted from a source of molten metal alloy using a quenching wheel in a partial vacuum.

Abstract: Glassy metal alloys which include substantial amounts of one or more of the refractory metals of molybdenum, tungsten, tantalum and niobium evidence both high thermal stability, with a high crystallization temperature of at least about 700.degree. C, and a high hardness of at least about 1000 kg/mm.sup.2.

Abstract: Amorphous metallic alloys having substantial amounts of one or more of the elements of Mo, W, Ta and Nb evidence both high thermal stability, with crystallization temperatures ranging from about 650.degree. C to 975.degree. C, and high hardness, with values ranging from about 800 to 1400 DPH (diamond pyramid hardness).

Abstract: Amorphous metal alloys are prepared from compositions in the beryllium-titanium-zirconium system. The compositions, in the form of long, continuous ribbon, are defined within an area on a ternary diagram having as its coordinates in atom percent beryllium, atom percent titanium, and atom percent zirconium, the area being defined by a polygon having at its corners the 10 points defined byA. 40% Be, 58% Ti, 2% ZrB. 35% Be, 57% Ti, 8% ZrC. 30% Be, 55% Ti, 15% ZrD. 30% Be, 20% Ti, 50% ZrE. 35% Be, 0% Ti, 65% ZrF. 45% Be, 0% Ti, 55% ZrG. 55% Be, 15% Ti, 30% ZrH. 55% Be, 20% Ti, 25% ZrI. 50% Be, 35% Ti, 15% ZrJ. 43% Be, 53% Ti, 4% Zr.These alloys evidence high strength, low density, a specific strength of at least about 33 .times. 10.sup.5 cm and good ductility. The alloys are useful in applications requiring a high strength-to-weight ratio.

Abstract: Single crystals of chromium-doped beryllium aluminate find advantageous use in optical applications and, in particular, in lasers capable of operating at room temperature.

Abstract: Amorphous metal alloys are prepared from titanium-beryllium base compositions comprising about 48 to 68 atom percent titanium and about 32 to 52 atom percent beryllium, with up to about 10 atom percent of beryllium replaced by additional alloying elements such as transition metals and metalloids. These alloys evidence high strength, good ductility and low density. The alloys are potentially useful in applications requiring a high strength-to-weight ratio.

Abstract: Novel single crystals of doped beryllium lanthanate having up to 50 atomic percent dopant substituted for lanthanum are provided which find advantageous use in optical applications and, in particular, as laser hosts.

Abstract: Amorphous metal alloys are prepared from titanium-beryllium base compositions comprising about 48 to 68 atom percent titanium and about 32 to 52 atom percent beryllium, with up to about 10 atom percent of beryllium replaced by additional alloying elements such as transition metals and metalloids. These alloys evidence high strength, good ductility and low density. The alloys are potentially useful in applications requiring a high strength-to-weight ratio.

Abstract: Single crystals of chromium-doped beryllium aluminate find advantageous use in optical applications and, in particular, in lasers capable of operating at room temperature.