Evidence for mechanical softening-hardening dual anomaly in transition metals from shock-compressed vanadium
Evidence for mechanical softening-hardening dual anomaly in transition metals from shock-compressed vanadium
复制标题
冲击压缩钒过渡金属中机械软化-硬化双重异常的证据
DOI：
10.1103/physrevb.104.134102
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发表时间：
2021-10
影响因子：
3.7
通讯作者：
Hua Y. Geng
中科院分区：
文献类型：
--
作者：
Hao Wang;J. Li;X. M. Zhou;Y. Tan;L. Hao;Y. Y. Yu;C. D. Dai;K. Jin;Q. Wu;Q. M. Jing;X. R. Chen;X. Z. Yan;Y. X. Wang;Hua Y. Geng
固体在压缩时通常变得更硬更韧，在高温下变得更软。最近，在钒等VB族元素中预测了压缩诱导软化和加热诱导硬化双重异常。在这里，报告了这种违反直觉的现象的证据。通过精确测量激波产生的Hugoniot态的高温高压声速，结合第一性原理计算，我们不仅观察到了冲击钒中显著的压缩诱导声速降低，而且还观察到了强烈的加热诱导声速增强。前者对应于压缩引起的剪切模数软化，而后者反映了热引起的反向硬化。这些实验还揭示了杨氏模数的另一个反常现象。根据实验和理论数据，我们推测在Hugoniot相变过程中，钒可能从体心立方相转变为两种不同的三方相，这意味着静态和动态载荷的显著差异，以及偏应力和速率相关效应在高压相变动力学中的重要意义。
Solids usually become harder and tougher under compression and turn softer at elevated temperature. Recently, the compression-induced softening and heating-induced hardening dual anomaly was predicted in group VB elements such as vanadium. Here, the evidence for this counterintuitive phenomenon is reported. By using accurate high-temperature, high-pressure (HP) sound velocities measured at Hugoniot states generated by shockwaves, together with first-principles calculations, we observe not only the prominent compression-induced sound velocity reduction but also strong heating-induced sound velocity enhancement in shocked vanadium. The former corresponds to the softening in the shear modulus by compression, whereas the latter reflects the reverse hardening by heat. These experiments also unveil another anomaly in Young's modulus. Based on the experimental and theoretical data, we infer that vanadium might transition from body-centered cubic into two different rhombohedral phases at \ensuremath{\sim}79 and 116 GPa along the Hugoniot, respectively, which implies a dramatic difference in static and dynamic loading, as well as the significance of deviatoric stress and rate-relevant effects in HP phase transition dynamics.
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DOI：
10.1088/0953-8984/21/41/415402
发表时间：
2009-10
期刊：
Journal of Physics: Condensed Matter
影响因子：
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作者：
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通讯作者：
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影响因子：
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通讯作者：
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影响因子：
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通讯作者：
A. Krygier;P. Powell;J. McNaney;C. Huntington;S. Prisbrey;B. Remington;R. Rudd;D. Swift;C. Wehrenberg;A. Arsenlis;H. Park;P. Graham;E. Gumbrell;M. Hill;A. Comley;S. Rothman
DOI：
10.1063/1.5136052
发表时间：
2020-01
期刊：
The Journal of chemical physics
影响因子：
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作者：
Yi X Wang;H. Geng;Q. Wu;Xiang-Rong Chen
通讯作者：
Yi X Wang;H. Geng;Q. Wu;Xiang-Rong Chen
DOI：
10.1088/1361-648x/ab099b
发表时间：
2019-02
期刊：
Journal of Physics: Condensed Matter
影响因子：
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作者：
Philipp Keuter;D. Music;V. Schnabel;M. Stuer;J. Schneider
通讯作者：
Philipp Keuter;D. Music;V. Schnabel;M. Stuer;J. Schneider