静水加载下退火和预变形锆的微观结构演变和 α → ω 相变的原位研究

IF 2.7 3区 物理与天体物理 Q2 PHYSICS, APPLIED
K. K. Pandey, Valery I. Levitas, Changyong Park, Guoyin Shen
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引用次数: 0

摘要

本文利用原位 X 射线衍射技术,详细研究了锆在不可逆的 α→ω 相变之前、期间和之后以及压力释放期间,在静水压力作用下初始微观结构对其演变的影响。研究了两个样品:一个是具有饱和硬度的塑性预变形 Zr,另一个是退火样品。对于预变形样品,相变 α→ω 在较低压力下开始,但对于 ω Zr 的体积分数 c>0.7,退火样品的体积分数较大。这意味着连续相变理论中的热阻转变与屈服强度之间的比例关系是无效的;概述了该理论的高级版本。根据微结构参数概述了静水荷载下的现象塑性理论,并估算了塑性应变。在转变过程中,提出了第一条规则,即当 c<0.8 时,ω Zr 中的平均畴尺寸、微应变和位错密度仅是ω Zr 体积分数 c 的函数,与转变前的塑性应变张量和压力无关。在相变过程中,微观结构不会继承。令人惊讶的是,对于退火样品,ω 相的最终位错密度和压力释放后的平均微应变都大于严重预变形样品。这些结果表明,压力诱导相变和微结构演变的预测模型需要更广泛的实验基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
In situ study of microstructure evolution and α → ω phase transition in annealed and pre-deformed Zr under hydrostatic loading
The detailed study of the effect of the initial microstructure on its evolution under hydrostatic compression before, during, and after the irreversible α→ω phase transformation and during pressure release in Zr using in situ x-ray diffraction is presented. Two samples were studied: one is plastically pre-deformed Zr with saturated hardness and the other is annealed. Phase transformation α→ω initiates at lower pressure for a pre-deformed sample but for a volume fraction of ω Zr, c>0.7, a larger volume fraction is observed for the annealed sample. This implies that the proportionality between the athermal resistance to the transformation and the yield strength in the continuum phase transformation theory is invalid; an advanced version of the theory is outlined. Phenomenological plasticity theory under hydrostatic loading is outlined in terms of microstructural parameters, and plastic strain is estimated. During transformation, the first rule is suggested, i.e., the average domain size, microstrain, and dislocation density in ω Zr for c<0.8 are functions of the volume fraction, c of ω Zr only, which are independent of the plastic strain tensor prior to transformation and pressure. The microstructure is not inherited during phase transformation. Surprisingly, for the annealed sample, the final dislocation density and the average microstrain after pressure release in the ω phase are larger than for the severely pre-deformed sample. The results suggest that an extended experimental basis is required for the predictive models for the combined pressure-induced phase transformations and microstructure evolutions.
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来源期刊
Journal of Applied Physics
Journal of Applied Physics 物理-物理:应用
CiteScore
5.40
自引率
9.40%
发文量
1534
审稿时长
2.3 months
期刊介绍: The Journal of Applied Physics (JAP) is an influential international journal publishing significant new experimental and theoretical results of applied physics research. Topics covered in JAP are diverse and reflect the most current applied physics research, including: Dielectrics, ferroelectrics, and multiferroics- Electrical discharges, plasmas, and plasma-surface interactions- Emerging, interdisciplinary, and other fields of applied physics- Magnetism, spintronics, and superconductivity- Organic-Inorganic systems, including organic electronics- Photonics, plasmonics, photovoltaics, lasers, optical materials, and phenomena- Physics of devices and sensors- Physics of materials, including electrical, thermal, mechanical and other properties- Physics of matter under extreme conditions- Physics of nanoscale and low-dimensional systems, including atomic and quantum phenomena- Physics of semiconductors- Soft matter, fluids, and biophysics- Thin films, interfaces, and surfaces
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