Georg Hasemann1,Weiguang Yang2,Ruth Schwaiger2,Manja Krueger1
Otto von Guericke Universität Magdeburg1,Forschungszentrum Jülich GmbH2
Georg Hasemann1,Weiguang Yang2,Ruth Schwaiger2,Manja Krueger1
Otto von Guericke Universität Magdeburg1,Forschungszentrum Jülich GmbH2
The V-Si-B system has gained scientific interest as a new low-density, refractory metal-based structural intermetallic alloy system. The alloy design is strongly influenced and driven by the developments in the field of Mo-Si-B alloys and shares some interesting structural and microstructural features. Very recently, the formations of ternary eutectic V<sub>SS</sub>-V<sub>3</sub>Si-V<sub>5</sub>SiB<sub>2</sub> microstructure has been reported [1] which contains the same isomorphous phases as the ternary eutectic in the well-studied Mo-Si-B system: a refractory metal-based solid-solution phase (Mo<sub>SS</sub> or V<sub>SS</sub>) and the two intermetallic phases with either an A15 (Mo<sub>3</sub>Si and V<sub>3</sub>Si) or a D8<sub>l</sub> (Mo<sub>5</sub>SiB<sub>2</sub> and V<sub>5</sub>SiB<sub>2</sub>) structure. In contrast to the Mo-based system, where the intermetallic Mo<sub>3</sub>Si represents the major phase within the ternary eutectic microstructure, the V<sub>SS</sub>-V<sub>3</sub>Si-V<sub>5</sub>SiB<sub>2</sub> eutectic features the ductile solid-solution phase as the major component. This fact makes the V-Si-B ternary eutectic very interesting in terms of its mechanical properties.<br/>The present work is focused on the compressive stress-strain behavior of different near-eutectic V-Si-B alloy. Compression tests were performed using an electro-mechanical universal testing machine and a constant crosshead speed corresponding to an initial (engineering) strain rate of 10<sup>-3</sup> s<sup>-1</sup>. The yield stresses were determined by the 0.2% offset method. The temperature dependence of its yield stress between room temperature and 1000 °C was investigated in the as-cast and annealed state (1400 °C for 100 hrs) of the fully eutectic alloy V-9Si-6.5B and were compared to literature values of different V-based alloys [2–4].<br/><br/><b>References</b><br/>[1] W.G. Yang, G. Hasemann, M. Yazlak, B. Gorr, R. Schwaiger, M. Krüger, J. Alloys Compd. 902 (2022) 163722.<br/>[2] H. Bei, E.P. George, E.A. Kenik, G.M. Pharr, Z. Met. 95 (2004) 505–512.<br/>[3] S. Xie, E.P. George, MRS Proc. 980 (2007) 0980-II08-05.<br/>[4] M. Krüger, Scr. Mater. 121 (2016) 75–78.