Processing soft ferromagnetic metallic glasses: on novel cooling strategies in gas atomization, hydrogen enhancement, and consolidation

N. Ciftci, N. Yodoshi, S. Armstrong, L. Mädler, V. Uhlenwinkel

Table 2 Process parameters including cooling strategies and alloy selection as well as gas atomization characteristics.

Cooling strategy Alloy (at.%) Atomizer Inert gas Vacuum (kPa) D (mm) Tliq (K) TM (K) ΔTM (K) p (MPa) m˙L (kg h-1) m˙G (kg h-1) GMR Conventional gas atomization (GA) {(Fe0.6Co0.4)0.75B0.2Si0.05}96Nb4 CD-CCA-0.8 Argon 1 2 1484 1834 350 1.6 149 780 5.2 Conventional gas atomization (GA) Fe76B10Si9P5 CD-CCA-0.8 Argon 1 2 1338 1688 350 1.6 142 780 5.5 Spray cone cooling (GA + SCC) {(Fe0.6Co0.4)0.75B0.2Si0.05}96Nb4 CD-CCA-0.8 Argon 1 2 1484 1834 350 1.6 146 780 5.3 Spray cone cooling (GA + SCC) {(Fe0.6Co0.4)0.75B0.2Si0.05}96Nb4 CD-CCA-0.8 Argon 1 2 1484 1834 350 1.6 151 780 5.2 Spray cone cooling (GA + SCC) Fe76B10Si9P5 CD-CCA-0.8 Argon 1 2 1338 1688 350 1.6 142 780 5.5 Spray cone cooling (GA + SCC Fe76B10Si9P5 CD-CCA-0.8 Argon 1 2 1338 1688 350 1.6 149 780 5.2 Liquid quenching in H2O (GA + LQ) {(Fe0.6Co0.4)0.75B0.2Si0.05}96Nb4 CD-CCA-0.8 Argon 1 2 1484 1834 350 1.6 175 780 4.5 Liquid quenching in H2O (GA + LQ) {(Fe0.6Co0.4)0.75B0.2Si0.05}96Nb4 CD-CCA-0.8 Argon 1 2 1484 1834 350 1.6 168 780 4.7 Liquid quenching in PEG (GA + LQ) {(Fe0.6Co0.4)0.75B0.2Si0.05}96Nb4 CD-CCA-0.8 Argon 1 2 1484 1834 350 1.6 141 780 5.5 Liquid quenching in H2O (GA + LQ) Fe76B10Si9P5 CD-CCA-0.8 Argon 1 2 1338 1688 350 1.6 144 780 5.4 Liquid quenching in H2O (GA + LQ) Fe76B10Si9P5 CD-CCA-0.8 Argon 1 2 1338 1688 350 1.6 148 780 5.3