Aluminum-based powder for metal additive manufacturing, producing method thereof, and metal additive manufactured objects thereof

A metal additive manufactured object,

• wherein the metal additive manufactured object has a solidified structure of crystal grains,
• wherein a number average of ratios of longest to shortest diameters of respective crystal grains is not less than 1 and not more than 3,
• wherein precipitates of which longest diameters are not more than 5 μm are scattered in the crystal grains of the solidified structure, the precipitates comprising at least one kind of precipitates selected from borides and carbides of group 4 elements, and
• wherein the metal additive manufactured object contains not less than 0.01% by mass and not more than 1.2% by mass of the precipitates.