A method for obtaining a lead-free or low lead content brass billet subjects a mixture of lead-free or low lead content brass chips and graphite powder to extrusion, either direct or inverted. The method obtains lead-free or low lead content brass billets.

A method for obtaining a lead-free or low lead content brass billet subjects a mixture of lead-free or low lead content brass chips and graphite powder to extrusion, either direct or inverted. The method obtains lead-free or low lead content brass billets.

A method for synthesis of PtNi smooth surface core/shell particles or Nano cages and porous nanocages from segregated nanoparticles.

A method for synthesis of PtNi smooth surface core/shell particles or Nano cages and porous nanocages from segregated nanoparticles.

A method to achieve full densification and grain size control for sintering metal materials, wherein raw material powder is deagglomerated to obtain deagglomerated powder with dispersion. The deagglomerated powder is granulated by spray granulation. The granulated particles are processed by high-pressure die pressing and cold isostatic pressing. The powder compact is sintered by two-step pressureless sintering. The first step is to heat up the powder compact to a higher temperature and hold for a short time to obtain 75-85% theoretical density; the second step is to cool down powder compact to a lower temperature and hold for a long time. The two-step sintering can decrease the sintering temperature, so that the powder compact can be densified at a lower temperature. Thus, the obtained refractory metal product is densified, with ultrafine grains, uniform grain size distribution, and outstanding mechanical properties.

A process for additive manufacture of an article including conjoined first and second metals, wherein the first metal includes one of steel and titanium and the second metal includes another of the steel and the titanium. The process comprises arranging an interface layer of a third metal on a substrate of the first metal, wherein the third metal is capable of forming an alloy with the first metal and capable of forming an alloy with the second metal. The process further comprises supplying a consumable form of the second metal to a locus of the interface layer and heating the locus of the interface layer in an non-reactive environment. In this process, the heating fuses the consumable form of the second metal to render a fused form of the second metal and joins the fused form of the second metal to the interface layer.

Disclosed is a method for producing a high-entropy alloy superconductor bulk materials and wire materials, the method including a first step of mixing 4 to 10 types of metals selected from a group consisting of niobium (Nb), tantalum (Ta), titanium (Ti), hafnium (Hf), zirconium (Zr), tungsten (W), molybdenum (Mo), chromium (Cr), vanadium (V), and rhenium (Re) with each other to prepare a mixture and then milling the mixture to prepare mixed metal powders; and a second step of sintering the mixed metal powders prepared in the first step.

Disclosed is a method for producing a high-entropy alloy superconductor bulk materials and wire materials, the method including a first step of mixing 4 to 10 types of metals selected from a group consisting of niobium (Nb), tantalum (Ta), titanium (Ti), hafnium (Hf), zirconium (Zr), tungsten (W), molybdenum (Mo), chromium (Cr), vanadium (V), and rhenium (Re) with each other to prepare a mixture and then milling the mixture to prepare mixed metal powders; and a second step of sintering the mixed metal powders prepared in the first step.

Provided is a hard sintered body which exhibits excellent high temperature oxidation resistance and has a high hardness at a high temperature. In the hard sintered body, a binder phase is contained at from 8.8 to 34.4 mol % and the balance is composed of a hard phase and inevitable impurities. The binder phase contains iron aluminide containing FeAl as a main component and alumina that is dispersed in iron aluminide and has a particle size of 1 μm or less. The hard phase is composed of at least one kind selected from carbides, nitrides, carbonitrides and borides of Group 4 metals, Group 5 metals and Group 6 metals in the periodic table, and solid solutions of these. This hard sintered body is obtained by mixing and pulverizing a binding particle powder containing an iron aluminide powder composed of at least one kind selected from FeAl.sub.2, Fe.sub.2Al.sub.5 and FeAl.sub.3 and a hard particle powder composed of at least one kind selected from carbides, nitrides, carbonitrides and borides of Group 4 metals, Group 5 metals and Group 6 metals in the periodic table and then sintering a mixed powder thus obtained.

A wire explosion assembly configured to form nanoparticles by exploding at least a segment of an electrically conductive wire. The wire explosion assembly includes a spool supporting the electrically conductive wire, a vessel defining a wire explosion chamber, means in the wire explosion chamber for pulling the electrically conductive wire off of the spool and applying tension on the segment of the electrically conductive wire, and a power source for delivering an electrical current to the segment of the electrically conductive wire. The electrical current is configured to explode the segment of the electrically conductive wire into the nanoparticles.