摘要:
Improved refractories for resisting attack of molten titanium aluminum and similar metals are provided by the inclusion of sulfur. Metal, oxygen, and sulfur combinations, wherein sulfur is present at from 10 to 60 atomic percent, are particularly useful.Disclosed is a material having the atomic formula M.sub.a S.sub.b O.sub.c where O is oxygen, S is sulfur, and M is at least one metal selected from the scandium subgroup of the periodic table transition metals (scandium, yttrium and the rare earths) and aluminum. In an alternate material, M is comprised of at least two elements, the first selected as above and the second selected from the alkaline earth metal group. A preferred material is formed by mixing and firing CaS and Y.sub.2 O.sub.3 in proportions which results in (Ca+Y).sub.0.43 S.sub.0.14 O.sub.0.43.
摘要:
The high temperature strength to density ratio of titanium aluminum niobium alloys of the Ti.sub.3 Al (alpha two) type is increased when molybdenum is added. New alloys contain by atomic percent 25-27 aluminum, 11-16 (niobium+molybdenum), 1-4 molybdenum, balance titanium. When vanadium replaces up to 3.5% molybdenum a lighter weight alloy is produced. The new alloys have higher elastic modulus and higher creep strength to density ratio than alloys without molybdenum.
摘要:
Cast and forged titanium alloys suited for use at temperatures over 600.degree. C. are based on TiAl gamma phase structure. Useful alloys have about 1.5% or greater tensile ductility at temperatures of 260.degree. C. and below, thereby making them fabricable and suited for engineering applications. Disclosed are alloys having weight percent compositions of 31-36 aluminum, 0-4 vanadium, balance titanium (in atomic percent, about: 45-50Al, 0-3V, bal Ti). The inclusion of about 0.1 weight percent carbon improves creep rupture strength. To obtain high tensile strength, the alloys are forged at about 1025.degree. C. and aged at about 900.degree. C.; to obtain higher creep rupture strength and tensile ductility, a solution anneal at about 1150.degree. C. is interposed before aging.
摘要:
Processing of Ti-6246 for improved mechanical properties including fracture toughness and low cycle fatigue. The process includes beta forging, sub beta transus solutionizing, controlled cooling and precipitation treating.
摘要:
Methods for enhancing the toughness of otherwise brittle powder metallurgy materials are presented. Adding moderate amounts of tough particulate to such brittle material enhances their ductility in excess of that which would be predicted mathematically.
摘要:
Titanium-aluminum-niobium alloys having narrow and critical composition ranges are disclosed. The alloys have room temperature tensile elongations of 1.5% or greater and creep strength to density ratios better than certain nickel superalloys. Thus, they may replace other heavier base alloys in many applications up to 750.degree. C. Aluminum content must be closely controlled as excess amount decreases ductility while insufficient amount decreases creep strength. Niobium content is also critical as excess amount adversely affects creep strength-to-density ratio while insufficient amount decreases ductility. And there is an important interrelationship between niobium and aluminum.Disclosed are alloys having atomic percent compositions of 24-27 Al, 11-16 Nb, balance Ti; more preferred are alloys of 24.5-26 Al, 12-15 Nb, balance Ti. (Nominally, these alloys in weight percent are Ti-13/15Al-19.5/30Nb and Ti-13.5/15Al-25/28Nb.) Vanadium is uniquely found to be substitutional for niobium in the foregoing alloys in amounts up to 4 atomic percent, thereby reducing density and increasing strength-to-density ratio while maintaining properties. Mechanical properties are dependent on heat treatment. For the best combination of strength and ductility, the alloys are heated or forged above the beta transus and controllably cooled to produce a fine Widmanstatten microstructure.
摘要:
Methods for determining the hardness and/or ductility of a material by compression of the material are provided as a first aspect of the invention. Typically, compression is performed on multiple sides of a geologic material sample in a contemporaneous manner. Devices and systems for performing such methods also are provided. These methods, devices, and systems can be combined with additional methods, devices, and systems of the invention that provide for the analysis of compounds contained in such samples, which can indicate the presence of valuable materials, such as petroleum-associated hydrocarbons. Alternatively, these additional methods, devices, and systems can also stand independently of the methods, devices, and systems for analyzing ductility and/or hardness of materials.
摘要:
The invention described here provides new methods of analyzing materials, e.g., geologic materials, to identify wettability characteristics of such materials. Methods of the invention comprise analyzing the amount of easily extracted water obtained from samples of a material, such as a geologic area, analyzing release resistant water obtained from such samples or co-located samples, and/or optionally calculating or analyzing the combined water in or obtained from such samples, and utilizing such values alone or in comparison to one another to assess the wettability characteristics of the material.
摘要:
The present disclosure relates to a golf swing training device that gives real-time visual feedback for obtaining correct golf club swing mechanics. Features and implementations include: (1) a number of alignment indicators such as disks or blocks capable of lying flat on the ground or a surface; (2) a cable, string, rope, or chain that connects the alignment indicators and that the alignment indicators are spaced along; (3) a positioning guide placed on the ground or a surface that indicates proper placement of the connected alignment indicators in order to create the proper arc shape of the connected alignment indicators; and (4) alignment markers on each alignment indicator to show the proper angle the golf club face should have at different points during a swing.
摘要:
The present disclosure relates to a golf swing training device that gives real-time visual feedback for obtaining correct golf club swing mechanics. Features and implementations include: (1) a number of alignment indicators such as disks or blocks capable of lying flat on the ground or a surface; (2) a cable, string, rope, or chain that connects the alignment indicators and that the alignment indicators are spaced along; (3) a positioning guide placed on the ground or a surface that indicates proper placement of the connected alignment indicators in order to create the proper arc shape of the connected alignment indicators; and (4) alignment markers on each alignment indicator to show the proper angle the golf club face should have at different points during a swing.