A characterization method of an oxide dispersion-strengthened (ODS) iron-based alloy powder is provided. The characterization method comprises separating the strengthening phases from the powder matrix through electrolysis, and analyzing and characterizing the strengthening phases using an electron microscope.

A multi-scale and multi-phase dispersion strengthened iron-based alloy, and preparation and characterization methods thereof are provided. The alloy contains a matrix and a strengthening phase. The strengthening phase includes at least two types of the strengthening phase particles with different sizes. A volume of the two types of the strengthening phase particles with different sizes having a particle size less than or equal to 50 nm accounts for 85-95% of a total volume of all the strengthening phase particles. The matrix is a Fe—Cr—W—Ti alloy. The strengthening phases include crystalline Y.sub.2O.sub.3 phase, Y—Ti—O phase, Y—Cr—O phase, and Y—W—O phase. The characterization method comprises electrolytically separating the strengthening phases in the alloy, and then characterizing by using an electron microscope. The tensile strength of the prepared alloy is more than 1600 MPa at room temperature, and is more than 600 MPa at 700° C.

A multi-scale and multi-phase dispersion strengthened iron-based alloy, and preparation and characterization methods thereof are provided. The alloy contains a matrix and a strengthening phase. The strengthening phase includes at least two types of the strengthening phase particles with different sizes. A volume of the two types of the strengthening phase particles with different sizes having a particle size less than or equal to 50 nm accounts for 85-95% of a total volume of all the strengthening phase particles. The matrix is a Fe—Cr—W—Ti alloy. The strengthening phases include crystalline Y.sub.2O.sub.3 phase, Y—Ti—O phase, Y—Cr—O phase, and Y—W—O phase. The characterization method comprises electrolytically separating the strengthening phases in the alloy, and then characterizing by using an electron microscope. The tensile strength of the prepared alloy is more than 1600 MPa at room temperature, and is more than 600 MPa at 700° C.

A method for forming tungsten-refractory metal alloy powders, and tungsten-refractory metal alloy powders formed by the method. The method includes mixing a majority portion by weight of a base tungsten powder with a minority portion by weight of a base refractory metal powder to form a mixture, which is then milled for a period of time sufficient to at least partially mechanically alloy the base tungsten powder and base refractory metal powder together to form at-least-partially-mechanically-alloyed particles, which are then heat treated to a temperature sufficient to promote diffusion between tungsten and the refractory metal and obtain agglomerations of particles having only a tungsten phase, which are then milled to break up the agglomerations of particles and obtain the tungsten-refractory metal alloy powder.

A powdered alloy with a chemical composition of Al.sub.xSi, where X is an amount of Si from 10 to 30 weight percent. More specifically, a powdered alloy with a chemical composition of Al.sub.xSi.sub.ySn.sub.zIn, where X is an amount of Si from 10 to 30 weight percent, Y is an amount of Sn from 0.01 to 0.50 weight percent, and Z is an amount of In from 0.005 to 0.05 weight percent.

The invention provides a process for producing powders of novel multicomponent based shape memory alloys. The memory shape alloys are made by combining at least 4 to 6 elements selected from a combination of group IUPAC 4 transition metal (Ti) with group IUPAC 10 transition metals (Ni and Pt) to make up the basic ternary alloy with further additions of 1 up to 3 other transition metals making a final alloy of a maximum of 4 up to 6 components.

A metal composite that includes a core comprising titanium, zirconium, and niobium, and a shell comprising titanium, zirconium, and niobium, wherein the shell covers at least a portion of the core; and a method of fabricating the metal composite by mechanically alloying and 3D printing a metal powder comprising titanium, niobium, and zirconium. Various embodiments of the metal composite and the method of fabricating the same are also provided.

A metal composite that includes a core comprising titanium, zirconium, and niobium, and a shell comprising titanium, zirconium, and niobium, wherein the shell covers at least a portion of the core; and a method of fabricating the metal composite by mechanically alloying and 3D printing a metal powder comprising titanium, niobium, and zirconium. Various embodiments of the metal composite and the method of fabricating the same are also provided.

Composite materials include a steel matrix with reinforcing carbon fiber integrated into the matrix. The composite materials have substantially lower density than steel, and are expected to have appreciable strength. Methods for forming composite steel composites includes combining a reinforcing carbon fiber component, such as a woven polymer, with steel nanoparticles and sintering the steel nanoparticles in order to form a steel matrix with reinforcing carbon fiber integrated therein.

Composite materials include a steel matrix with reinforcing carbon fiber integrated into the matrix. The composite materials have substantially lower density than steel, and are expected to have appreciable strength. Methods for forming composite steel composites includes combining a reinforcing carbon fiber component, such as a woven polymer, with steel nanoparticles and sintering the steel nanoparticles in order to form a steel matrix with reinforcing carbon fiber integrated therein.