Microstructure and mechanical properties of five Nb alloys containing 8 to 17 at.% Mo, 8 or 35 at.% Zr, up to 7 at.% Ti, up to 2 at.% Al and up to 2 at.% Cr are reported. These alloys have been developed to replace heavy, expensive and difficult to process commercial Nb alloys, such as C-3009, for use at temperatures up to 1600 °C. The density of the alloys is in the range from 7.6 to 8.6 g/cm³. The alloys have a BCC matrix phase, and they also contain small amounts of secondary phases, which are rich in Zr and have BCC, FCC, hexagonal or monoclinic crystal structures depending on the concentration of other alloying elements, including oxygen and nitrogen. In the temperature range from 25 °C to 1600 °C, the alloys with a smaller amount of Zr are ductile and have higher specific strength than C-3009. The alloy containing 35 at.% Zr is stronger, but less ductile, than other alloys at temperatures up to 600 °C; however, it loses the strength rapidly at higher temperatures and becomes softer than other alloys at T > 1000 °C. The possible strengthening mechanisms responsible for the observed temperature dependence of the yield stress of the alloys are also discussed.

据报道，五种Nb合金的显微组织和力学性能分别为：Mo含量为8-17％，Zr含量为8或35％，Ti含量最高为7at％，Al含量最高为2at％，Cr含量最高为2at％。 。这些合金已被开发出来，以代替重金属，昂贵且难以加工的商用Nb合金，例如C-3009，可在高达1600°C的温度下使用。合金的密度在7.6至8.6 g / cm ³的范围内。合金具有BCC基体相，并且还包含少量的第二相，这些第二相富含Zr，并具有BCC，FCC，六方或单斜晶晶体结构，具体取决于其他合金元素（包括氧气和氮气）的浓度。在25°C至1600°C的温度范围内，Zr量较小的合金具有延展性，比强度比C-3009高。Zr含量为35 at。％的合金在温度高达600°C时比其他合金更坚固，但延展性更低；但是，它在高温下会迅速失去强度，在T  > 1000°C时会比其他合金软。还讨论了可能的加强机制，这些机制负责观察到的合金屈服应力的温度依赖性。