High pressure phase transformation in iron under fast compression

被引：28

作者：

Bastea, Marina ^{[1
]}

Bastea, Sorin ^{[1
]}

Becker, Richard ^{[1
]}

机构：

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

来源：

APPLIED PHYSICS LETTERS | 2009年 / 95卷 / 24期

关键词：

high-pressure solid-state phase transformations; iron; nucleation; thermodynamics; TRANSITION; KINETICS;

D O I：

10.1063/1.3275797

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We observe kinetic features-velocity loops-at the alpha to epsilon phase transformation of iron, similar with the ones reported when water is frozen into its ice VII phase under comparable experimental conditions. By using a phase nucleation and growth kinetic model with pressure dependent phase interface velocity we find that the thermodynamic path followed by the sample is strongly dependent on the drive conditions and sample characteristics. The velocity loops become broader and shallower at slower compressions, while on faster time-scales, e.g., for laser drivers, the loops form at higher velocities and may eventually disappear.

引用

页数：3

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