This article examines the use of nanosecond electromagnetic pulses (NESPs) to alloy aluminum with refractory metals. The alloying is done by treating aluminum melts with halides of transition-group elements. The action of NESPs on the given system at power densities within the range 1000–1500 MW/m3 partially destroys clusters in the melt and increases its fluidity; the high-melting alloying elements have an inoculating effect, and the gaseous reaction products that are formed create the conditions necessary for efficient refining of the melt. High-power electro-impulsive loading results in the formation of compact globular intermetallide inclusions of the Al-Mo and Al-Ti systems. These inclusions, with a size of 3–8 µm, improve the physicomechanical characteristics of aluminum alloys. The use of aluminum — refractory metal master alloys and silumins prepared with the use of NESPs improves the quality of thin-walled castings of complex form.