Preparation of an Fe80P14B6 Bulk Nanocrystalline Alloy via Solidification from a Molten Alloy at Deep Undercooling.

Using fluxing technology, molten Fe₈₀P₁₄B₆ alloy achieved significant undercooling (ΔT). Experimental results demonstrate that the solidified morphologies of the Fe₈₀P₁₄B₆ alloy vary considerably with ΔT. At ΔT = 100 K, the microstructure is dendritic. At ΔT = 250 K, a variety of eutectic morphologies are observed, including a network-like structure near the solidification center, attributed to liquid spinodal decomposition. At ΔT = 350 K, the microstructure exhibits a uniform, random network-like morphology with approximately 50 nm. The mechanical property of the specimens solidified at different ΔT was checked by microhardness test, indicating that the hardness of the specimens increases with the increase in ΔT, reaching a maximum value of 1151 HV_0.2.