Provided is a heat sink that has a clad structure of a Cu—Mo composite material and a Cu material and has a low coefficient of thermal expansion and high thermal conductivity. A heat sink comprises three or more Cu layers and two or more Cu—Mo composite layers alternately stacked in a thickness direction so that two of the Cu layers are outermost layers on both sides, wherein each of the Cu—Mo composite layers has a thickness section microstructure in which flat Mo phase is dispersed in a Cu matrix. The heat sink has a low coefficient of thermal expansion and also has high thermal conductivity in the thickness direction because the thickness of each of the Cu layers which are the outermost layers is reduced, as compared with a heat sink of a three-layer clad structure having the same thickness and density.

A method, product, apparatus, and article of manufacture for the application of the Composite Based Additive Manufacturing (CBAM) method to produce objects in metal, and in metal fiber hybrids or composites. The approach has many advantages, including the ability to produce more complex geometries than conventional methods such as milling and casting, improved material properties, higher production rates and the elimination of complex fixturing, complex tool paths and tool changes and, for casting, the need for patterns and tools. The approach works by slicing a 3D model, selectively printing a fluid onto a sheet of substrate material for each layer based on the model, flooding onto the substrate a powdered metal to which the fluid adheres in printed areas, clamping and aligning a stack of coated sheets, heating the stacked sheets to melt the powdered metal and fuse the layers of substrate, and removing excess powder and unfused substrate.

In one aspect, composite articles are described herein employing cobalt-based alloy claddings exhibiting high hardness and wear resistance while maintaining desirable integrity and adhesion to surfaces of metallic substrates. A composite article, in some embodiments, comprises a metallic substrate and a composite cladding metallurgically bonded to one or more surfaces of the metallic substrate, the composite cladding including cobalt-based alloy having a chromium gradient, wherein chromium content increases in a direction from the composite cladding surface to an interface of the composite cladding with the metallic substrate.

A method of adjusting a stamping die is provided. The method includes providing a two-sided stamping die configured to form parts from sheet metal blanks according to a desired geometry upon closing the die, adjusting the desired geometry of the part, and repeatedly depositing layer upon layer of material onto a first side of the die in a stacked configuration to modify the geometry of the first side of the die such that the die forms parts from sheet metal blanks according to the adjusted desired geometry.

A method, product, apparatus, and article of manufacture for the application of the Composite Based Additive Manufacturing (CBAM) method to produce objects in metal, and in metal fiber hybrids or composites. The approach has many advantages, including the ability to produce more complex geometries than conventional methods such as milling and casting, improved material properties, higher production rates and the elimination of complex fixturing, complex tool paths and tool changes and, for casting, the need for patterns and tools. The approach works by slicing a 3D model, selectively printing a fluid onto a sheet of substrate material for each layer based on the model, flooding onto the substrate a powdered metal to which the fluid adheres in printed areas, clamping and aligning a stack of coated sheets, heating the stacked sheets to melt the powdered metal and fuse the layers of substrate, and removing excess powder and unfused substrate.

Additive fabrication methods for 3D composite objects having preform fiber reinforcements embedded in a matrix material include providing local heat and mechanical energy to at least partially melt, impregnate and solidify the matrix material forming at least one reinforced composite layer of the object. Successive layers are added in accordance to a computer generated tool path to form a three dimensional object with useful features.

Additive fabrication methods for 3D composite objects having preform fiber reinforcements embedded in a matrix material include providing local heat and mechanical energy to at least partially melt, impregnate and solidify the matrix material forming at least one reinforced composite layer of the object. Successive layers are added in accordance to a computer generated tool path to form a three dimensional object with useful features.

A composite cemented carbide roll comprising an inner layer made of an iron-based alloy, and an outer layer made of cemented carbide which is metallurgically bonded to an outer peripheral surface of the inner layer; the cemented carbide of the outer layer comprising 55-90 parts by mass of WC particles and 10-45 parts by mass of an Fe-based binder phase having a particular composition; a shaft member and a shaft end member being metallurgically bonded to at least one axial end of the inner layer; the inner layer being made of an iron-based alloy containing 2.0% or more in total by mass of at least one selected from the group consisting of Cr, Ni and Mo; and the shaft member and the shaft end member being made of an iron-based alloy containing 1.5% or less in total by mass of at least one selected from the group consisting of Cr, Ni and Mo.

A method for preparing metal/metal interpenetrating phase composites is provided. The method includes forming a preform using additive manufacturing. The preform defines a materially continuous three-dimensional open-cell mesh structure. The preform includes a first metal having a melting point. The method further includes pre-heating the preform to a first temperature less than the melting point of the first metal. The method includes infiltrating the preform with a second metal in liquid form. The second metal has a melting point lower than the melting point of the first metal. The method also includes allowing the second metal to cool and form a solid matrix. The solid matrix defines a continuous material network.

Additive fabrication methods for 3D composite objects having preform fiber reinforcements embedded in a matrix material include providing local heat and mechanical energy to at least partially melt, impregnate and solidify the matrix material forming at least one reinforced composite layer of the object. Successive layers are added in accordance to a computer generated tool path to form a three dimensional object with useful features.