Lattice-level observation of the elastic-to-plastic relaxation process with subnanosecond resolution in shock-compressed Ta using time-resolved in situ Laue diffraction

被引：29

作者：

Wehrenberg, C. E. ^{[1
]}

Comley, A. J. ^{[2
]}

Barton, N. R. ^{[1
]}

Coppari, F. ^{[1
]}

Fratanduono, D. ^{[1
]}

Huntington, C. M. ^{[1
]}

Maddox, B. R. ^{[1
]}

Park, H. -S. ^{[1
]}

Plechaty, C. ^{[3
]}

Prisbrey, S. T. ^{[1
]}

Remington, B. A. ^{[1
]}

Rudd, R. E. ^{[1
]}

机构：

[1] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[2] Atom Weap Estab, Reading RG7 4PR, Berks, England

[3] Riverside Res, Beavercreek, OH 45431 USA

来源：

PHYSICAL REVIEW B | 2015年 / 92卷 / 10期

关键词：

TANTALUM; DYNAMICS;

D O I：

10.1103/PhysRevB.92.104305

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report direct lattice-level measurements of plastic relaxation kinetics through time-resolved, in situ Laue diffraction of shock-compressed single-crystal [001] Ta at pressures of 27-210 GPa. For a 50-GPa shock, a range of shear strains is observed extending up to the uniaxial limit for early data points (<0.6 ns), and the average shear strain relaxes to a near steady state over similar to 1 ns. For 80- and 125-GPa shocks, the measured shear strains are fully relaxed already at 200 ps, consistent with rapid relaxation associated with the predicted threshold for homogeneous nucleation of dislocations occurring at shock pressure similar to 65 GPa. The relaxation rate and shear stresses are used to estimate the dislocation density, and these quantities are compared to the results of other high-pressure work, flow stress models, and molecular dynamics simulations.

引用

页数：8

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