Rhenium is used as an additive to tungsten- and molybdenum-based alloys to give useful properties. These alloys are used for high temperature applications (Tungsten-rhenium filament and method for producing same (2002)), and x-ray machines (X-Ray Tube Having Anode Target Layer Of Molybdenum Rhenium Alloy (1973)).
Rhenium and its alloys are used as electrical terminal materials (e.g. in spark plugs as they resist wear and withstand arc corrosion (W-Rhenium Sintered Alloy For Ignition Plug And Ignition Plug For Gas Engine Using It As Electrode (1996))).
Rhenium catalysts are extremely resistant to poisoning (deactivation) and are used for the hydrogenation of fine chemicals: Catalyzed hydrogenation of terephthalic acid to p-hydroxymethylbenzoic acid using a rhenium catalyst (1984).
Some rhenium is used in nickel alloys to make single-crystal turbine components: Turbine Component Made From Superalloy Comprising Rhenium And Associated Manufacturing Process (2019).