Behavior of Aluminum near an Ultimate Theoretical Strength in Experiments with Femtosecond Laser Pulses

被引：158

作者：

Ashitkov, S. I. ^{[1
]}

Agranat, M. B. ^{[1
]}

Kanel', G. I. ^{[1
]}

Komarov, P. S. ^{[1
]}

Fortov, V. E. ^{[1
]}

机构：

[1] Russian Acad Sci, Joint Inst High Temp, Moscow 125412, Russia

来源：

JETP LETTERS | 2010年 / 92卷 / 08期

关键词：

FRACTURE; TEMPERATURES; DEFORMATION; EQUATION; TENSION; METALS; RATES; STATE;

D O I：

10.1134/S0021364010200051

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The dynamics of the motion of the free surface of micron and submicron films under the action of a compression pulse excited in the process of femtosecond laser heating of the surface layer of a target has been investigated by femtosecond interferometric microscopy. The relation between the velocity of the shock wave and the particle velocity behind its front indicates the shock compression to 9-13 GPa is elastic in this duration range. This is also confirmed by the small (<= 1 ps) time of an increase in the parameters in the shock wave. Shear stresses reached in this process are close to their estimated ultimate values for aluminum. The spall strength determined at a strain rate of 10(9) s(-1) and a spall thickness of 250-300 nm is larger than half the ultimate strength of aluminum.

引用

页码：516 / 520

页数：5

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