Liu Lei, Jing Qiumin, Geng Hua Y, Li Yinghua, Zhang Yi, Li Jun, Li Shourui, Chen Xiaohui, Gao Junjie, Wu Qiang
National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP, Mianyang 621900, China.
Materials (Basel). 2023 Jul 21;16(14):5157. doi: 10.3390/ma16145157.
Zirconium (Zr) is an important industrial metal that is widely used in nuclear engineering, chemical engineering, and space and aeronautic engineering because of its unique properties. The high-pressure behaviors of Zr have been widely investigated in the past several decades. However, the controversies still remain in terms of the phase transition (PT) pressures and the isostructural PT in β-Zr: why the PT pressure in Zr is so scattered, and whether the β to β' PT exists. In the present study, to address these two issues, the Zr sample with ultra-high purity (>99.99%) was quasi-hydrostatically compressed up to ~70 GPa. We discovered that both the purity and the stress state of the sample (the grade of hydrostaticity/nonhydrosaticity) affect the PT pressure of Zr, while the stress state is the dominant factor, the nonhydrostaticity significantly promotes the PT of Zr. We also propose two reasons why the β-β' isostructural PT was absent in the subsequent and present experiments, which call for further investigation of Zr under quasi-compression up to 200 GPa or even higher pressures.
锆（Zr）是一种重要的工业金属，因其独特的性能而广泛应用于核工程、化学工程以及航天和航空工程领域。在过去几十年中，人们对Zr的高压行为进行了广泛研究。然而，在相变（PT）压力和β-Zr中的同结构PT方面仍存在争议：为什么Zr中的PT压力如此分散，以及β到β'的PT是否存在。在本研究中，为了解决这两个问题，将超高纯度（>99.99%）的Zr样品准静态压缩至约70 GPa。我们发现，样品的纯度和应力状态（静水压力/非静水压力等级）都会影响Zr的PT压力，而应力状态是主导因素，非静水压力会显著促进Zr的PT。我们还提出了后续实验和本实验中未出现β-β'同结构PT的两个原因，这需要在高达200 GPa甚至更高压力的准压缩条件下对Zr进行进一步研究。
