The invention relates to a process for manufacturing a part, involving forming consecutive solid metal layers (20.sub.1 . . . 20.sub.n) that are stacked on top of one another, each layer describing a pattern defined on the basis of a numerical model {M), each layer being formed by depositing a metal (25), referred to as filling metal, the filling metal being subjected to an input of energy so as to melt and constitute said layer upon solidifying, the filling metal being in the form of a powder (25) that is exposed to an energy beam (32), resulting in melting followed by solidification such that a solid layer (20.sub.1 . . . 20.sub.n) is formed, the process being characterized in that the filling metal (25) is an aluminum alloy comprising at least the following alloying elements: —Ni, in a moiety of 1 to 6%, preferably 1 to 5.5%, more preferably 2 to 5.5%; —Cr, in a moiety of 1 to 7%, preferably 3 to 6.5%; —Zr, in a moiety of 0.5 to 4%, preferably 1 to 3%; —Fe, in a moiety of no more than 1%, preferably between 0.05 and 0.5%, more preferably between 0.1 and 0.3%; —Si, in a moiety of no more than 1%, preferably no more than 0.5%. The invention also relates to a part obtained by said process. The alloy used in the additive manufacturing process according to the invention makes it possible to obtain parts with remarkable features.

Disclosed is a high-elasticity aluminum alloy which contains carbide to improve elongation. Further, a method of manufacturing the high-elasticity aluminum alloy is provided. The method includes steps of: charging pure aluminum and an Al-5B master alloy in a melting furnace to form a first molten metal; charging an Al-10Ti master alloy in the first molten metal to form a second molten metal; charging silicon (Si) element in the second molten metal to form a third molten metal; adding carbon (C) to the third molten metal to form a fourth molten metal; and tapping the fourth molten metal into a mold to cast the fourth molten metal.

The invention relates to a preparation method for a magnesium matrix composite. The preparation method comprises the following steps: (1) preparing magnesium ingots as raw materials and salt flux and reinforcements; (2) placing the salt flux in a crucible, performing heating to prepare salt flux melts, adding the reinforcements; (3) performing pouring into a normal-temperature crucible, and performing cooling to obtain precursors; (4) adding the raw materials in an iron crucible, and performing melting at 953K-1043K; (5) placing the precursors in raw material melt, after stirring, under a condition of 953K-993K, performing standing so that scum and melt are obtained; and (6) removing the scum, lowering temperature to 973K-982K, and performing casting. The method provided by the present invention is simple in process and low in cost. The method can be used for preparing bulk structural members of the magnesium matrix composite, and can be used for automatic production.

A method for depositing a hardened layer includes sequentially depositing a hardened layer. The hardened layer is formed by spraying a powder material for forming a hardened layer, which is obtained by mixing a first powder containing a Stellite alloy with a second powder containing tungsten carbide, toward a substrate, and melting and solidifying the powder material on/above the substrate. As the hardened layer to be formed is away from the substrate in a deposition direction, at least one of a heat input adjustment step and a content adjustment step is performed. The heat input adjustment step is a step of reducing a heat input for the powder material during formation of the hardened layer. The content adjustment step is a step of increasing a content of the second powder in the powder material for the hardened layer.

A method for depositing a hardened layer includes sequentially depositing a hardened layer. The hardened layer is formed by spraying a powder material for forming a hardened layer, which is obtained by mixing a first powder containing a Stellite alloy with a second powder containing tungsten carbide, toward a substrate, and melting and solidifying the powder material on/above the substrate. As the hardened layer to be formed is away from the substrate in a deposition direction, at least one of a heat input adjustment step and a content adjustment step is performed. The heat input adjustment step is a step of reducing a heat input for the powder material during formation of the hardened layer. The content adjustment step is a step of increasing a content of the second powder in the powder material for the hardened layer.

A metal matrix nanocomposite includes: 1) a matrix including one or more metals; and 2) nanostructures uniformly dispersed and stabilized in the matrix at a volume fraction, including those greater than about 3% of the nanocomposite.

A method for producing a dispersion strengthened material is presented. The method includes exposing a plurality of first metal particles to a suspension of dispersoid forming particles to form metal particles having the dispersoid forming particles thereon. The metal particles having the dispersoid forming particles there are subjected to an energy process to form a dispersion strengthened material. Also provided is a method of manufacturing a dispersion strengthened material or metal component that contains nano-sized dispersoids in a metal-based matrix.

It is an object to provide a tungsten alloy exhibiting characteristics equal to or higher in characteristics than those of a thorium-containing tungsten alloy, without using thorium which is a radioactive material, and a discharge lamp, a transmitting tube, and a magnetron using the tungsten alloy. According to the present invention, a tungsten alloy includes 0.1 to 5 wt % of Zr in terms of ZrC.

Provided herein are nanocrystalline materials comprising, e.g., a matrix including one or more metals; and nanostructures dispersed in the matrix, wherein the matrix is polycrystalline and includes grains having an average size of about 1μm or less. Also provided herein are manufacturing methods of a nanocrystalline materials.

A Ni-base superalloy composition to be used for powder-based additive manufacturing (AM) technology, such as selective laser melting (SLM) or electron beam melting (EBM). The cracking susceptibility during an AM process is considerably reduced by controlling the amount of elements, especially Hf, that form low-melting eutectics.