Abstract
The present study reports on the microstructural evolution and room temperature plasticity of V(-Si)-B alloys with respect to the V solid solution (VSS)-V3B2 phase region. To investigate the occurring effects systematically, different binary V-B and ternary V-Si-B alloys were produced by conventional arc melting. Scanning electron microscope (SEM) analyses and X-ray diffraction (XRD) measurements were used to characterize the resulting as-cast microstructures. For the first time, the eutectic composition was systematically traced from the binary V-B domain to the ternary V-Si-B system. The observations discover that the binary eutectic trough (VSS-V3B2) seems to reach into the ternary system up to an alloy composition of V-5Si-9B. Room temperature compression tests were carried out in order to study the impact of single-phase and multi-phase microstructures on the strength and plasticity of binary and ternary alloys. The results indicate that the VSS phase controls the plastic deformability in the VSS-V3B2 eutectic microstructure whereas the intermetallic V3B2 acts as a strong hardening phase.
Highlights
V-Si-B alloys provide great potential as a new type of structural lightweight material for high temperature applications, e.g., in turbines for energy conversion, due to the high melting point of vanadium, Tm = 1910 ◦ C [1], and a comparable stress-strain behavior as the state-of-the-art Ni-based superalloy CMSX-4 at 1100 ◦ C in combination with a low density of % = 5.21–6.11 g/cm3 [2,3,4]
To replace Ni-based superalloys, they are in competition with Nb, Mo- or Pt-based high temperature materials that have been the focus of research for several years [5,6,7,8,9]
Investigations on vanadium alloys have shown that the alloying elements Si and B can reduce the formation of vanadium oxides and, positively influence the oxidation properties at high temperatures [10,11]
Summary
V-Si-B alloys provide great potential as a new type of structural lightweight material for high temperature applications, e.g., in turbines for energy conversion, due to the high melting point of vanadium, Tm = 1910 ◦ C [1], and a comparable stress-strain behavior as the state-of-the-art Ni-based superalloy CMSX-4 at 1100 ◦ C in combination with a low density of % = 5.21–6.11 g/cm3 [2,3,4]. The formation of protective SiO2 scales and the emergence of low-viscosity borosilicate glass by adding B make the ternary V-Si-B system appear promising for potential use in high temperature applications [10,11,12,13,14].
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