铈γ→α相变的室温动态特性

发布时间：2018-01-14 16:04

  本文关键词：铈γ→α相变的室温动态特性　出处：《爆炸与冲击》2017年03期 　论文类型：期刊论文

  更多相关文章： 铈 相变 静水压 相变模型

【摘要】：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1.7GPa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0.8~1.3GPa。逆相变过渡区的静水压范围是0.6~1.1GPa;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0.15GPa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4.2GPa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。
[Abstract]:Based on the passive confining pressure (SHPB) experiment designed for sample assembly size matching, 99.8% pure cerium was obtained in 1.7GPa hydrostatic pressure, containing 纬? The dynamic hydrostatic pressure-bulk strain continuum curves at room temperature in the transition region of 伪 -phase transition and inverse phase transition are obtained. The results show that cerium 纬 at room temperature. 鈫扵he 伪 phase transition is a first order phase transition with obvious hysteresis, rather than the first order phase transition with volume jump as previously considered. The hydrostatic pressure range of phase change transition zone is 0.81.3GPa.The hydrostatic pressure range of inverse transition zone is 0.61.1GPa. The hydrostatic pressure-volume strain curve of the inverse phase transition region lags behind that of the hydrostatic pressure volume strain curve of 0.15 GPA in the transition zone. In the transition region of phase transition and inverse phase transition, the hydrostatic pressure-volume strain curve evolves according to the linear relationship of volume modulus of about 4.2 GPA. The evolution mechanism is the homogeneous mixing of 纬 and 伪 phases, and the hydrostatic pressure drives the two-phase transformation. Based on the evolution mechanism, a three-stage linear model describing the hydrostatic pressure-body strain response before and after the phase transition and the phase transition process is constructed.
【作者单位】： 中国工程物理研究院流体物理研究所冲击波物理与爆轰物理重点实验室;
【分类号】：O341
【正文快照】： 铈是地球上含量最丰富、价格最便宜的稀土元素,被广泛应用于玻璃和搪瓷的脱色剂、玻璃抛光粉、燃料减排的添加剂、打火石等用途[1]。在物理和力学性能方面,铈最吸引研究者关注的是静水压控制的、一阶同构的γ→α相变。其室温下的力学表现是:随着静水压的增加,单一γ相材料在0，

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