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Effect of Fe-B-Si composition on maximum thickness for casting amorphous metals

The maximum melt spun thickness which can be made amorphous was measured for Fe-B-Si compositions by determining the minimum in the coercivity vs. thickness curve. The peak value of this critical thickness, t c , was 42 μm, corresponding to the alloy Fe 74 B 16 Si 10 . This value is six times smaller than those previously reported. This difference is attributed to the more sensitive H c method used to detect t c in the present investigation compared to the visual observation of crystals at 100X magnification used in the previous work. X-ray diffraction and differential scanning calorimetry were used to confirm that the minimum H c corresponds to t c . The H c varied inversely with t c as expected from a model based on domain wall pinning on the surfaces. Changing the wheel material from Cu to steel, or decreasing the wheel diameter both increased t c because of better wetting of the wheel by the melt. Theoretical prediction of t c , based on theories of crystal nucleation and growth kinetics and on experimental studies of heat flow in the melt spinning process, gave Values of t c roughly comparable to those observed experimentally. The calculated peak in t c at Fe 73 B 16 Si 11 is close to the experimentally measured peak at Fe 74 B 16 Si 10 .