Articles are manufactured using self-propagating high-temperature synthesis (SHS) reactions. Particulates including reactants can be blended to form a particulate blend. The particulate blend can be preformed. The preform article can be heated to a pre-heat temperature being below an auto-activation temperature and above a minimum compression activated synthesis temperature. Compressive stress can be exerted on the preform article at the pre-heat temperature to initiate the SHS reaction between the reactants and thereby form a product metallic compound. At approximately peak temperature, a flow stress of the product metallic compound can be exceeded to substantially reduce porosity and thereby form a shaped substantially dense article.

A method of fabricating a part by selectively melting powder is provided. The method includes: depositing a first layer of a first powder having a first element as its main element; depositing, on the first layer, a second layer of a second powder having a second element as its main element, which second element is different from the first element; and moving a first energy beam over the second layer, the energy delivered by the first beam serving to initiate an exothermic reaction between the first element and the second element, the energy given off by the exothermic reaction acting to locally melt together the first and second layers.

An interembedded autogenous tungsten (molybdenum)-copper alloy powder, and a preparation method and use thereof are provided. By controlling concentration and type of an organic complex, positive ion metal salts and negative ion metal groups form coordination bonds with hydroxyl oxygen and carboxyl carbon of the organic complex so as to form complexes, respectively. A stepwise heat treatment is conducted to controllably prepare a tungsten (molybdenum)-copper alloy powder with a unique interembedded autogenous structure.

An interembedded autogenous tungsten (molybdenum)-copper alloy powder, and a preparation method and use thereof are provided. By controlling concentration and type of an organic complex, positive ion metal salts and negative ion metal groups form coordination bonds with hydroxyl oxygen and carboxyl carbon of the organic complex so as to form complexes, respectively. A stepwise heat treatment is conducted to controllably prepare a tungsten (molybdenum)-copper alloy powder with a unique interembedded autogenous structure.

Metallic matrix composites include a high strength titanium aluminide alloy matrix and an in situ formed aluminum oxide reinforcement. The atomic percentage of aluminum in the titanium aluminide alloy matrix can vary from 40% to 48%. Included are methods of making the metallic matrix composites, in particular, through the performance of an exothermic chemical reaction. The metallic matrix composites can exhibit low porosity.