Intrinsic Elinvar behavior was first reported in β-metastable Ti-22Nb-6Zr alloy. However, it was limited to a high temperature range and was strongly dependent on the heating rate. It was shown that such intrinsic Elinvar behavior was attributed to the negligible temperature dependence of the elastic constants of the Ti-based β-phase. Therefore, the aim of the present work is to search for the wide-temperature intrinsic Elinvar behavior in novel compositions of β-titanium alloys. For this purpose, Ti-22Nb-15Zr, Ti-40 … 50Nb and Ti-12.6 … 20Mo (at.%) were produced and thermomechanically treated to form a recrystallized predominantly β-phase structure. Their elastic-temperature behavior, grain structure, phase thermal stability, magnetic response and electrochemical behavior were analyzed. Ti-22Nb-15Zr and Ti-40 … 50Nb alloys combine a wide temperature range, two-way Elinvar behavior (during both heating and cooling) with |αfr2| values on the order of 10−5 °C−1 that remain stable within the studied heating/cooling-rate range, a paramagnetic response, and corrosion resistance. These properties identify these alloys as a new subclass of paramagnetic corrosion-resistant β-titanium intrinsic Elinvar alloys. Moreover, the design of β-titanium intrinsic Elinvar alloys should consider not only the intrinsic elastic response of the BCC β-phase, but also the stability of the β-phase over the required temperature range.
