TY  - GEN
ID  - heidok28369
CY  - Heidelberg
AV  - public
Y1  - 2020///
TI  - Fabrication of metal microfibers by melt-spinning
N2  - Metal microfibers have a wide range of industrial applications, e.g. as filters, fiber-reinforced composites, electrodes, catalysts, sensors, or magnetic shielding materials. In this project, we modified melt-spinning device and its experimental parameters to fabricate metal microfibers. It was shown for the first time that metal microfibers down to 5 ?m could be fabricated using a melt spinning device. The size and circularity of formed fibers could be controlled by experimental parameters.e.g. slit distance to the wheel, chamber pressure, slit size, wheel speed. The mechanism of fiber formation relies on two main steps; i)thin film formation on the rotating wheel ii)spontaneous breaking of the film to smaller widths, dewetting the wheel. It was shown that this process is reproducible and could be used for different classes of materials. e.g. intermetallic alloys, conventional alloys, metal elements and amorphous alloys.
The modification of the melt spinning device leads to higher quenching rates up to 108!C/s. The high quenching rate made it possible to make fully amorphous stainless steel fibers for the very first time. Heat-treatment of amorphous stainless steel leads to dual-phase microstructure (nanocrystals embedded together with a glassy phase) which was responsible for its ultra-high hardness value, 14GPa. This value is 7 times higher than the original stainless steel hardness. Thus, the technique opens new possibilities for working with conventional and amorphous alloys e.g. mechanically improved conventional alloy microfibers/ribbons, introducing new alloy microstructures.
A1  - Sharifikolouei, Elham
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/28369/
ER  -