... tungsten rods. An unavoidable byproduct of the spallation reactions is large amounts of helium and hydrogen gas generated in the rods. The release kinetics of these gases during various proposed off-normal scenarios involving loss of coolant and afterheat-induced rises in temperature are of particular...

... on these studies, the chemical composition of 10.5Cr-2.5W-1Co-0.2Re-VMoNbNB steel with large amount of Laves phase and high solute tungsten content was determined for the new blade material. The producibility of this steel were verified with 2 ton ESR ingots which were successfully manufactured by various...

... surrounding materials. neutrons high energy protons spallation tungsten copper nickel boron beryllium High Energy Transport Code (HETC) irradiation Monte Carlo Ayman L Hawarg 1 Arvind S. Kumar, 1 and Lawrence R. Greenwoodz Calculated Productionof High-Energy Neutrons by 800-MeV Protons...

... A study has been performed experimentally to determine the polishing methods for high-power laser mirrors. This paper presents ultrafine polishing of tungsten (W) and molybdenum (Mo) which cannot be turned by a diamond tool. Samples were prepared by five methods: lapping with SiC abrasives...

... A brief review is given of the manufacture of tungsten from ore to finish product. Some of the important properties are discussed, and a comparison is made of the properties of tungsten and those of other metals. The uses of tungsten are given as they relate to its properties. tungsten...

... The chemical process industry utilizes many different materials of construction to contain and to instrument the many varied and often aggressive chemical processes. Molybdenum, niobium, tantalum, and tungsten, known as the refractory metals, see limited use in the chemical process industry...

... Failure modes are described for compressed cylindrical specimens of several aluminum alloys, 4340 steel of various tempers, several tungsten alloys, and textured titanium alloy Ti-4Al-4V. One common feature of failure among all the materials is that shear cracks are the first to initiate...

... Tungsten-silver materials were made by two different powder metallurgical techniques which resulted in alloys having a wide latitude of structural variation in terms of volume fraction, particle size, and distribution. A correlation of G Ic , the critical strain energy release rate, was made...

...-aluminum, beryllium-aluminum, tungsten-copper, and other composites generally coincide with the composite shakedown limits because the matrix yield stresses and fatigue limits are equal. In heat-treated composites, the matrix yield stress is usually much higher than the fatigue limit, and matrix fatigue...

... of irradiation have been considered, and it is concluded that a combination of void-induced swelling and shrinkage due to the formation of the tungsten by transmutation accounts for the observed dimensional behavior of tantalum during irradiation at 500°C. radiation irradiation tantalum fast neutrons...

... of interferences must be considered before application can be made using theoretical principles. selected gravimetric procedures are discussed to illustrate these concepts for two of the more common elements (carbon and silicon), as well as two of the more difficult (rare earths and tungsten). In the carbon method...

... in order to avoid interferences of 1 9 9 Au and 9 9 m Tc. Additionally, the rhenium and tungsten contents were determined. An isotopic anomaly of rhenium was established in Apollo 14 samples, exhibiting a remarkable enrichment of 1 8 7 Re (1.4 to 1.8 percent in soils and up to 29 percent in the breccia...

... The impact properties of copper, copper-10 nickel, and a superalloy matrix reinforced with tungsten fibers were studied. In most cases, the following increased composite impact strength: increased fiber or matrix toughness, decreased fiber-matrix reaction, increased test temperature, hot working...

... The observed critical aspect ratio for pullout specimens of tungsten wire in a copper matrix tested in stress rupture at 649 and 816 C was slightly greater than for tension tests at the same temperature. Time for failure of the stress rupture specimens was controlled by the properties...

... and demonstrated excellent transverse strength properties in the fiber crushing test. Both observations are confirmed in tests of metal matrix composites. tungsten boron fibers composite materials metals residual stress coatings brittleness tensile strength crushing compressive strength fractures...

... The microstrain characteristics of continuously reinforced tungsten-copper composites have been studied as a function of volume fraction of fibers and prestrain. In the unstrained condition, the dislocation friction stress of all of the specimens studied had a value of approximately 0.28 kgf/mm...

... An analysis of the creep deformation of fiber reinforced metallic composites was developed. Equations for predicting the creep rate and stress-rupture properties of fiber reinforced metallic composites were presented. Stress-rupture and creep tests were conducted at 1200 and 1500 F on tungsten...

... The length to diameter ratio and orientation of the fibers in discontinuous fiber reinforced composites was correlated to their elevated temperature tensile properties. Composites were made of copper and copper - 2 per cent chromium alloy reinforced with tungsten fibers having various length...