When bulk materials are made into micro and nano scale fibres, there will be attractive improvement of structural and functional properties, even unusual experimental phenomena. The main drawback of various applications of metallic fibres is poor ability of present fabrication methods for controlling their dimensions and surface properties. Metallic glassy fibres (MGFs) are desired because of unique mechanical and physical properties and glass-like thermoplastic processability of metallic glasses.
Recently, WANG Wei Hua’s group in Institute of Physics, Chinese Academy of Sciences developed a synthetic route for production of micro to nano scale MGFs (the diameter ranges from 100 m to 70 nm) by driving bulk metallic glass rods in their supercooled liquid region via superplastic deformation.
Compared with existing metallic fibres, the MGFs have precisely designed and controlled properties and size, high structural uniformity and surface smoothness, and extremely flexibility. Remarkably, the method is simple, efficient and low cost, and the MGFs can be continuous prepared by the method.
Furthermore, the MGFs circumvent brittleness of metallic glasses by size reduction. They proposed a parameter based on the thermal and rheological properties of MG-forming alloys to control the preparation and size of the fibres. The MGFs with superior properties might attract intensive scientific interest and open wide engineering and functional applications of glassy alloys. (Related results were published in Adv Eng Mater12, 1117 (2010))
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| SEM images of Pd40Cu30Ni10P20 MGFs (Image by IOP) |
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