Abstract In this study, the effects of vanadium (V) addition on the microstructures and mechanical properties of hot-rolled Zr–9Al–χV alloys (χ = 0, 2 and 4 at. %) were systematically investigated. Microscopic analyses indicated that the microstructures of hot-rolled Zr–9Al–χV alloys were sensitive to the V content. The hot-rolled Zr–9Al alloy was completely dynamically recrystallized and consisted of the α phase only, whereas the hot-rolled Zr–9Al–2V alloy consisted of partially recrystallized α and transformed β (α′ + β). The tensile tests showed that the difference between the ultimate and yield strengths of the hot-rolled Zr–9Al alloy approximated 20 MPa, whereas that of the hot-rolled Zr–9Al–2V alloy was about 200 MPa. The evident strain hardening of the hot-rolled Zr–9Al–2V alloy was caused by the mechanical contrast between the soft and hard components of the microstructure. The hot-rolled Zr–9Al–4V alloy consisted of large elongated β grains, in which equiaxed α and acicular α" grains were distributed. The engineering stress–strain curve of the hot-rolled Zr–9Al–4V alloy exhibited a double-yielding behaviour, which was caused by stress-induced martensite phase transformation: β→α".

中文翻译：

---

热轧加工的新型 Zr-Al-V 合金的组织和力学性能

摘要 在本研究中，系统研究了钒 (V) 添加对热轧 Zr-9Al-χV 合金（χ = 0、2 和 4 at.%）的显微组织和机械性能的影响。显微分析表明，热轧 Zr-9Al-χV 合金的显微组织对 V 含量敏感。热轧 Zr-9Al 合金完全动态再结晶，仅由 α 相组成，而热轧 Zr-9Al-2V 合金由部分再结晶 α 和相变 β (α' + β) 组成。拉伸试验表明，热轧 Zr-9Al 合金的极限强度和屈服强度之间的差异约为 20 MPa，而热轧 Zr-9Al-2V 合金的极限强度和屈服强度之间的差异约为 200 MPa。热轧 Zr-9Al-2V 合金的明显应变硬化是由显微组织软硬成分之间的机械对比引起的。热轧 Zr-9Al-4V 合金由大的细长 β 晶粒组成，其中分布有等轴 α 和针状 α" 晶粒。热轧 Zr-9Al-4V 合金的工程应力-应变曲线呈现出双-屈服行为，这是由应力引起的马氏体相变引起的：β→α"。