In one example in accordance with the present disclosure, a system is described. The system includes a fracture channel controller to determine fracture channels for a three-dimensional (3D) printed object. Portions of the 3D printed object along fracture channels are to be solidified to a lesser degree as compared to non-channel portions of the 3D printed object. The system also includes an additive manufacturing controller to control an additive manufacturing device. The additive manufacturing controller controls the additive manufacturing device to 1) solidify portions of a layer of powdered build material to form a slice of the 3D printed object and 2) selectively solidify fracture channels in the slice, wherein the fracture channels are solidified to a lesser degree as compared to non-channel portions.

A method for forming a reinforced metallic structure includes providing a tool having a formation surface corresponding to a desired structure shape of the reinforced metallic structure. The method also includes positioning a plurality of fibers on the formation surface of the tool. The method also includes depositing a layer of material on the plurality of fibers using a cold-spray technique. The method also includes removing the layer of material with the plurality of fibers from the tool to create the reinforced metallic structure.

An additive manufacturing obstacle part can comprise a base structure comprising at least one external obstacle, and at least one internal obstacle that is formed at least partially within the base structure. The at least one internal obstacle can comprise an elongated internal obstacle extending through the base structure between an inlet and an outlet formed in the base structure. The elongated internal obstacle can comprise at least one wall extending along a nonlinear path. The non-linear path can hinder travel of excess material from an additive manufacturing process along a linear path between the inlet and outlet. This can help a designer to assess an additive manufacturers ability to cleanly produce an internal feature to specifications while removing excess material resulting from the additive manufacturing process.

An apparatus is disclosed to create a breakaway junction for 3D printed parts. Powder is spread along a target zone, such as a build bed. A liquid functional agent is selectively dispensed upon the powder to form a 3D object, a supporting part, and the breakaway junction between them.

An apparatus is disclosed to create a breakaway junction for 3D printed parts. Powder is spread along a target zone, such as a build bed. A liquid functional agent is selectively dispensed upon the powder to form a 3D object, a supporting part, and the breakaway junction between them.

A plurality of interconnected products manufactured using additive manufacturing or 3D printing, wherein at least 50% of the products of the plurality of products are connected by a breakable connection to at least one neighboring product of the plurality of products, wherein the breakable connection is adapted to be broken apart by a tool adapted to apply force on at least one side of at least two products. A method, tool, and computer program product additively manufacture the products.

A core-shell particle is provided, including a core particle composed of a non-reactive component, and a coating layer disposed about the core particle, the coating layer composed of reactive component. The reactive component is chemically reactive with water, acid, or base, and the non-reactive component is non-reactive with water, acid, or base. Also provided are a bulk composition composed of the core-shell particle, an article composed of the bulk composition, as well as method and system of making and using the particles, composition, and articles.

A method for forming a reinforced metallic structure includes providing a tool having a formation surface corresponding to a desired structure shape of the reinforced metallic structure. The method also includes positioning a plurality of fibers on the formation surface of the tool. The method also includes depositing a layer of material on the plurality of fibers using a cold-spray technique. The method also includes removing the layer of material with the plurality of fibers from the tool to create the reinforced metallic structure.

A process for producing a powder witness coupon including additively manufacturing a container simultaneously with a primary part, filling at least a portion of the container with a feed material employed for the part simultaneously with the additive manufacturing of the primary part, and sealing the container during the additive manufacturing of the primary part. An in-situ feed material powder witness coupon including a container additively manufactured simultaneously with a primary part, and a plurality of individual chambers within the container, at least one of the chambers being removable intact from the container. Further, a method for enhancing examination of feed material in an additively manufactured part including additively manufacturing a container simultaneously with a primary part, capturing feed material, density and environment in the container, and sealing the container.

An object of the present invention is to provide an additive manufactured object which is free of solidification cracking due to, e.g., heat shrinkage during additive manufacturing of an aluminum alloy; which is free of anisotropy in strength, and has high strength and ductility. An aluminum alloy powder for additive manufacturing includes aluminum alloy particles in which not less than 0.01% by mass and not more than 1% by mass of a grain refiner is trapped. This grain refiner is at least one selected from the borides and carbides of group 4 elements.