Alloy structure and method for producing alloy structure

An alloy powder used for additive manufacturing, comprising Fe and at least four elements other than Fe, which are selected from the group consisting of elements from atomic number 13 to atomic number 79 included in Group 3 to Group 16 of the periodic table of the elements and have an atomic radius, a ratio of which to an Fe's atomic radius is larger than or equal to 0.83 and smaller than or equal to 1.17,

• wherein the alloy powder is an atomized powder and has a particle size distribution within a range from 20 μm to 500 μm and wherein each of Fe and the at least four elements has an atomic concentration between 5 at % and 30 at %, and
• wherein the alloy powder contains, as inevitable impurities, P:
• 0.002 wt % or more but 0.005 wt % or less, Si:
• 0.010 wt % or more but 0.040 wt % or less, S:
• 0.001 wt % or more but 0.002 wt % or less, Sn:
• 0.002 wt % or more but 0.005 wt % or less, Sb:
• 0.001 wt % or more but 0.002 wt % or less, As:
• 0.001 wt % or more but 0.005 wt % or less, Mn:
• 0.020 wt % or more but 0.050 wt % or less, O:
• 0.0003 wt % or more but 0.001 wt % or less, and N:
• 0.001 wt % or more but 0.002 wt % or less.