Bulk metallic glass-based alloys for additive manufacturing

An iron-based bulk metallic glass alloy comprising:

• at least two first elements, the first element consisting of:
• when present, between 1 at % to 3 at % or between 12 at % to 14 at % zirconium (Zr), when present, between 12 at % to 14 at % molybdenum (Mo), between 13 at % to 15 at % aluminum (Al), when present, between 1 at % to 10 at % yttrium (Y), when present, between 1 volumetric percent (vol. %) and 3 vol % or between 15 vol % and 16 vol % chromium (Cr), and when present, between 3 at % and 5 at % manganese (Mn), wherein the at least two first elements include aluminum;
• between 7 at % and 9 at % phosphorous (P);
• no more than three second elements, the second elements being selected from:
• when present, between 0.5 at % and 4 at % or between 5 at % and 9 at % carbon (C), when present, between 0.1 at % and 1 at % or between 7 at % to 9 at % boron (B), and when present, between 10 at % to 12 at % silicon (Si);
• and
• the balance iron (Fe),
• wherein a majority of a structure of the bulk metallic glass alloy is amorphous;
• and
• wherein the alloy has a critical defect size, ac, of no less than 150 μm.