Ternary alloys of the Ti–Nb–Mo system are obtained by the method of arc remelting with subsequent crystallization on a copper water-cooled hearth. In these alloys characterized by contents of alloying elements corresponding to the molybdenum equivalent (Moeqv) within the range 3.2–4.0, we observe the formation of hexagonal (α′) and orthorhombic (α′′ ) martensites. For higher Moeqv (4.6), we detect the appearance of a phase based on β -titanium instead of the orthorhombic martensite. In all analyzed alloys, we do not reveal the acicular microstructures characteristic of martensites. In these alloys, the (β -Ti) phase has higher hardness and Young’s modulus as compared with α′ and α′′. The Ti94Nb4Mo2 and Ti92.5Nb5Mo2.5 as-cast alloys are characterized by low Young’s moduli (∼ 70 GPa).

中文翻译：

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Ti-Nb-Mo系铸造钛合金的组织和物理力学性能

Ti-Nb-Mo 系统的三元合金是通过电弧重熔和随后在铜水冷炉床上结晶的方法获得的。在这些合金中，合金元素含量对应于 3.2-4.0 范围内的钼当量 (Moeqv)，我们观察到六方 (α') 和斜方 (α'') 马氏体的形成。对于更高的 Moeqv (4.6)，我们检测到基于 β-钛而不是斜方马氏体的相的出现。在所有分析的合金中，我们没有揭示马氏体的针状微观结构特征。在这些合金中，与α'和α''相比，(β-Ti)相具有更高的硬度和杨氏模量。Ti94Nb4Mo2 和 Ti92.5Nb5Mo2.5 铸态合金的特点是杨氏模量低 (∼ 70 GPa)。