Abstract
The influences of Ho addition on the thermal stability of supercooled liquids, thermoplastic deformation as well as mechanical and soft-magnetic behaviors of Fe71-xHoxNb6B23 bulk metallic glasses (BMGs) were investigated. With increasing Ho content from 1 to 5 at. %, the supercooled liquid region (SCLR) increased from 48 to 90 K, and the thermal stability is largely enhanced through remained chemical short- or medium-ordering. Combined with the competitive formation process of the complex Fe23B6 and Ho2Fe14B phases, the glass-forming ability (GFA) of the alloy system was improved, allowing for the fabrication of glassy rods up to 3 mm in diameter. Due to the large SCLR and GFA, the Fe66Ho5Nb6B23 BMG with high fracture strength of 3.45 GPa shows outstanding thermoplastic forming ability accompanied with good soft magnetic performance.
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