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The effects of V and Nb on Vickers hardness (therefore strength) were analyzed in the temperature range from room temperature to 800 °C using arc melted ternary Ti-V-B (mainly 5 and 9 at.% B), Ti-Nb-B (5 and 7.5 at.% B) and quaternary Ti-Al-V(Nb)-B (9 at.% Al and 5 at.% B, 8.5 at.% Al and 7.5 at.% B) alloys. Alloying with V and Nb up to approximately 15 at.% (the range of multiphase matrix) increases hardness to a maximum at temperatures up to ~400 °C (ternary alloys) or up to -500 °C (quaternary alloys). At higher temperatures, however, this property degrades (excluding the ternary alloy containing much V, 45 at.%). At ~25 at.% V or Nb, which corresponds to practically completed stabilization of ß-phase, there are minima in the dependences hardness vs. alloying metal content. At about 15-20 at.%, the onset points of sharp softening temperatures decrease by -50 °C to the minimal level, up to -440 and -550 °C for the ternary and quaternary alloys, respectively.

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