A method comprising: supplying a metal alloy comprising Fe at a level of 65.5 to 80.9 atomic percent, Ni at 1.7 to 15.1 atomic percent, B at 3.5 to 5.9 atomic percent, Si at 4.4 to 8.6 atomic percent and optionally Cr at 0 to 8.8 atomic percent, Cu at 0 to 2.0 atomic percent and Mn at 0 to 18.8 atomic percent, wherein said atomic percentages are selected to provide 100 atomic percent of said metal alloy; melting said alloy at temperatures in the range of 1100 °C to 2000 °C and solidifying said alloy by cooling said alloy at a cooling rate in the range of 11x10 3 to 4x10 -2 K/s to provide a matrix grain size of 500 nm to 20,000 nm and a boride grain size of 25 nm to 500 nm; mechanical stressing said alloy at a stress in the range of 300 MPa to 840 MPa and/or heating said alloy at a temperature in the range of 700 °C to 1200 °C to form at least one of the following grain size distributions and mechanical property profiles, wherein said boride grains provide pinning phases that resist coarsening of said matrix grains: (a) matrix grain size of 500 nm to 20,000 nm, boride grain size of 25 nm to 500 nm, precipitation grain size of 1 nm to 200 nm wherein said alloy indicates a yield strength of 300 MPa to 840 MPa, tensile strength of 630 MPa to 1100 MPa and tensile elongation of 10 to 40%; or (b) refined matrix grain size of 100 nm to 2000 nm, precipitation grain size of 1 nm to 200 nm, boride grain size of 200 nm to 2,500 nm where the alloy has a yield strength of 300 MPa to 600 MPa. supplying a metal alloy comprising Fe at a level of 65.5 to 80.9 atomic percent, Ni at 1.7 to 15.1 atomic percent, B at 3.5 to 5.9 atomic percent, Si at 4.4 to 8.6 atomic percent and optionally Cr at 0 to 8.8 atomic percent, Cu at 0 to 2.0 atomic percent and Mn at 0 to 18.8 atomic percent, wherein said atomic percentages are selected to provide 100 atomic percent of said metal alloy; melting said alloy at temperatures in the range of 1100 °C to 2000 °C and solidifying said alloy by cooling said alloy at a cooling rate in the range of 11x10 3 to 4x10 -2 K/s to provide a matrix grain size of 500 nm to 20,000 nm and a boride grain size of 25 nm to 500 nm; mechanical stressing said alloy at a stress in the range of 300 MPa to 840 MPa and/or heating said alloy at a temperature in the range of 700 °C to 1200 °C to form at least one of the following grain size distributions and mechanical property profiles, wherein said boride grains provide pinning phases that resist coarsening of said matrix grains: (a) matrix grain size of 500 nm to 20,000 nm, boride grain size of 25 nm to 500 nm, precipitation grain size of 1 nm to 200 nm wherein said alloy indicates a yield strength of 300 MPa to 840 MPa, tensile strength of 630 MPa to 1100 MPa and tensile elongation of 10 to 40%; or (b) refined matrix grain size of 100 nm to 2000 nm, precipitation grain size of 1 nm to 200 nm, boride grain size of 200 nm to 2,500 nm where the alloy has a yield strength of 300 MPa to 600 MPa. (a) matrix grain size of 500 nm to 20,000 nm, boride grain size of 25 nm to 500 nm, precipitation grain size of 1 nm to 200 nm wherein said alloy indicates a yield strength of 300 MPa to 840 MPa, tensile strength of 630 MPa to 1100 MPa and tensile elongation of 10 to 40%; or (b) refined matrix grain size of 100 nm to 2000 nm, precipitation grain size of 1 nm to 200 nm, boride grain size of 200 nm to 2,500 nm where the alloy has a yield strength of 300 MPa to 600 MPa.