Nanocomposite metal material and method for manufacturing nanocomposite metal material

A nanocomposite metal material comprising:

• a carrier formed of Zr;
• and
• two-element metal particles supported on the carrier and formed of Cu and Ni,
• wherein
• a degree of oxidation of the carrier is more than 31% and 100% or less, and
• the two-element metal particles each has a core-shell structure with Ni as a core and Cu as a shell,
• a surface of the core and the shell includes a certain number of heat generation sites so that excessive heat of the nanocomposite metal material is 100 W/kg or more in a case where the nanocomposite metal material is disposed in a reaction furnace of a thermal reactor, the inside of the reaction furnace is brought into a vacuum state, and the inside of the reaction furnace is heated to a temperature range of 250° C. or higher and 350° C. or lower with a heating mechanism included in the thermal reactor while supplying at least one of hydrogen gas and deuterium gas into the reaction furnace, the excessive heat being calculated by comparison with data of a calorific value correction test in which a non-heating blank sample of zirconia beads is charged in the reaction furnace.