铈γ→α相变的室温动态特性
Explosion and Shock Waves（2017）
Abstract
通过试样组件尺寸匹配设计的被动围压SHPB实验,获得了99.8％纯铈在1.7 GPa静水压内的、包含γ(→)α相变和逆相变过渡区的室温动态静水压-体应变连续曲线.研究显示:室温铈γ→α相变是具有明显滞后现象的一级相变,而非以往研究认为的体积跃变的一级相变;相变过渡区的静水压范围是0.8～1.3 GPa.逆相变过渡区的静水压范围是0.6～1.1 GPa;逆相变过渡区的静水压-体应变曲线滞后于相变过渡区的静水压-体应变曲线0.15 GPa静水压;在相变和逆相变过渡区内,静水压-体应变曲线按照约4.2 GPa体积模量的线性关系演化;演化机制为γ和α两相均匀混合、静水压驱动两相组份转化.基于该演化机制,构建了描述相变前后和相变过程的静水压-体应变响应的三段线性模型.
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Key words
cerium,phase transition,hydrostatic pressure,phase transition model
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