Journal of Experimental and Theoretical Physics ( IF 1.1 ) Pub Date : 2021-03-08 , DOI: 10.1134/s1063776121010015 A. N. Emel’yanov , D. V. Shakhray , V. V. Kim
Abstract
The isentropic expansion of shock-compressed porous metals (Cu, W, Nb) are experimentally studied, and the experimental results are used to determine their thermodynamic parameters and electrical conductivity. These results allow us to conclude that some porous metals after shock compression and expansion have a two-phase structure. The presence of an additional phase at the isentropic expansion of these metals significantly changes the character of evaporation and the critical point parameters of the liquid–vapor phase transition that are estimated using experiments on the isentropic expansion of shock-compressed porous metals. In addition, the formation of the two-phase structure explains the large difference between the critical point parameters estimated by different methods for a large group of metals (U, W, V, Co, Mo, Ta, etc.).
中文翻译:
利用冲击压缩多孔样品的等熵膨胀实验估算金属的液相-气相相变临界点参数
摘要
对冲击压缩多孔金属(Cu,W,Nb)的等熵膨胀进行了实验研究,并用实验结果确定了它们的热力学参数和电导率。这些结果使我们可以得出结论,一些多孔金属在冲击压缩和膨胀后具有两相结构。这些金属的等熵膨胀处存在附加相会显着改变蒸发特性和液相-蒸气相变的临界点参数,这些参数是通过对冲击压缩多孔金属的等熵膨胀进行实验而估算的。此外,两相结构的形成解释了对于大量金属(U,W,V,Co,Mo,Ta等),通过不同方法估算的临界参数之间的巨大差异。