|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIII
||FeCoSiBNbCu Bulk Metallic Glass with Compressive Deformability
||Mihai Stoica, Sergio Scudino, Jozef Bednarcik, Ivan Kaban, Jürgen Eckert
|On-Site Speaker (Planned)
Fully amorphous rods with diameters up to 2 mm were obtained by adding 0.5 at. % Cu to the strong but brittle [(Fe<sub>0.5</sub>Co<sub>0.5</sub>)<sub>0.75</sub>Si<sub>0.05</sub>B<sub>0.20</sub>]<sub>96</sub>Nb<sub>4</sub> bulk metallic glass. The monolithic samples with 1 mm diameter revealed a fracture strain of 3.80% and a maximum stress of 4143 MPa upon compression. SEM micrographs of fractured samples did neither reveal any shear bands on the lateral surface nor the typical vein patterns which characterize ductile fracture. An estimate of the temperature rise ΔT in the shear plane gives 1039 K, which is large enough to melt a layer of 120 nm. The overall performance and the macroscopic plastic strain depend on the interaction between cleavage-like and viscous flow-like features. Mechanical tests performed in-situ under synchrotron radiation allowed the calculation of the strain tensor components, using the reciprocal-space data and analyzing the shift of the first (the main) and the second broad peak positions in the X-ray diffraction patterns.
||Planned: A print-only volume