A metal power recycling system has at least one chamber into which metal scraps are placed, at least one transmission line enabling metal scraps to be transferred out of the chamber, at least one pretreatment unit into which the metal scraps are transferred through the transmission line and in which oxygen removal, hydrogenation, cooling, grinding and sieving processes are performed for the metal scraps, at least one gathering chamber into which the sieved powder-form metal scraps are transferred from the pretreatment unit through the transmission line is disclosed.

A titanium alloy for additive manufacturing that includes 5.5 to 6.5 wt % aluminum (Al); 3.0 to 4.5 wt % vanadium (V); 1.0 to 2.0 wt % molybdenum (Mo); 0.3 to 1.5 wt % iron (Fe); 0.3 to 1.5 wt % chromium (Cr); 0.05 to 0.5 wt % zirconium (Zr); 0.2 to 0.3 wt % oxygen (O); maximum of 0.05 wt % nitrogen (N); maximum of 0.08 wt % carbon (C); maximum of 0.25 wt % silicon (Si); and balance titanium, wherein a value of an aluminum structural equivalent [Al].sub.eq ranges from 7.5 to 9.5 wt %, and is defined by the following equation: [Al].sub.eq=[Al]+[O]10+[Zr]/6, and wherein a value of a molybdenum structural equivalent [Mo].sub.eq ranges from 6.0 to 8.5 wt %, and is defined by the following equation:
[Mo].sub.eq=[Mo]+[V]/1.5+[Cr]1.25+[Fe]2.5.

Some variations provide a process for additive manufacturing of a nanofunctionalized metal alloy, comprising: providing a nanofunctionalized metal precursor containing metals and grain-refining nanoparticles; exposing a first amount of the nanofunctionalized metal precursor to an energy source for melting the precursor, thereby generating a first melt layer; solidifying the first melt layer, thereby generating a first solid layer; and repeating many times to generate a plurality of solid layers in an additive-manufacturing build direction. The additively manufactured, nanofunctionalized metal alloy has a microstructure with equiaxed grains. Other variations provide an additively manufactured, nanofunctionalized metal alloy comprising metals selected from aluminum, iron, nickel, copper, titanium, magnesium, zinc, silicon, lithium, silver, chromium, manganese, vanadium, bismuth, gallium, or lead; and grain-refining nanoparticles selected from zirconium, tantalum, niobium, titanium, or oxides, nitrides, hydrides, carbides, or borides thereof, wherein the additively manufactured, nanofunctionalized metal alloy has a microstructure with equiaxed grains.

A titanium alloy comprising Al 4.78 to 6.44 wt. %; V 3.65 to 5.15 wt. %; Mo 1.32 to 3.58 wt. %; Cr 0.75 to 2.28 wt. %; Fe 0.00 to 0.42 wt. %; C 0.00 wt. % to 0.10 wt. %; S 0.00 wt. % to 0.10 wt. %; N up to 500 ppm; O up to 2000 ppm and H up to 150 ppm; the balance being Ti and incidental elements and unavoidable impurities. Such a titanium alloy is useful for manufacturing gas turbine engine components including turbine blades and stators.

Aspects of the disclosure are directed to methods and/or apparatuses involving the formation of pore-free or nearly pore-free liquid droplets. As may be implemented in accordance with one or more embodiments, liquid droplets including metal are formed having pores within the liquid droplets. This may involve, for example, atomizing liquid metal with a gas and forming the droplets having pores. The pores are then driven out of the liquid droplets by heating the liquid droplets from a first state in which an outer surface of the droplets has a lower temperature than an inner region thereof, to a second state in which the outer surface has a higher temperature than the inner region.

A method of preparation of titanium and titanium alloy powder for 3D printing is based on a fluidized bed jet milling technique. Hydride-dehydrite titanium powder and titanium alloy powder are used as main raw material powder, jet milling and shaping are carried out in shielding atmosphere of nitrogen or argon, and finally high-performance titanium and titanium alloy powder meeting the requirements of 3D printing process is obtained. The titanium and titanium alloy powder prepared using this method has a narrow particle size distribution, approximately spherical shape, and controllable oxygen content.

Systems and methods for developing tough hypoeutectic amorphous metal-based materials for additive manufacturing, and methods of additive manufacturing using such materials are provided. The methods use 3D printing of discrete thin layers during the assembly of bulk parts from metallic glass alloys with compositions selected to improve toughness at the expense of glass forming ability. The metallic glass alloy used in manufacturing of a bulk part is selected to have minimal glass forming ability for the per layer cooling rate afforded by the manufacturing process, and may be specially composed for high toughness.

A metallic part is disclosed. The part may comprise a functionally graded monolithic structure characterized by a variation between a first material composition of a first structural element and a second material composition of at least one of a second structural element. The first material composition may comprise an alpha-beta titanium alloy. The second material composition may comprise a beta titanium alloy.

A magnetic material that includes: particles of a layered material including one or more layers and magnetic metal ions in contact with the one or more layers, wherein the one or more layers include a layer body represented by: M.sub.mX.sub.n, wherein M is at least one metal of Group 3, 4, 5, 6, or 7, X is a carbon atom, a nitrogen atom, or a combination thereof, n is not less than 1 and not more than 4, and m is more than n but not more than 5, and a modifier or terminal T is present on a surface of the layer body, wherein T is at least one selected from a hydroxyl group, a fluorine atom, a chlorine atom, an oxygen atom, and a hydrogen atom, and wherein the particles have an average value of thickness of not less than 1 nm and not more than 10 nm.

An additive manufacturing apparatus includes a chamber, an inert gas supplier, a material recovery pipeline, a material tank, a material replenishment pipeline, a transfer device, a classifier, a gas discharge pipeline, and a pump. The transfer device transfers a metal powder together with an inert gas. The gas discharge pipeline is connected to the transfer device and the chamber. The pump sends the inert gas discharged from the transfer device to the chamber.