Virtual Melting and Amorphization as Mechanisms of Plastic Flow, Fracture, and Phase Transformations

虚拟熔化和非晶化作为塑性流动、断裂和相变的机制

基本信息

  • 批准号:
    0969143
  • 负责人:
  • 金额:
    $ 30万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2010
  • 资助国家:
    美国
  • 起止时间:
    2010-07-01 至 2014-06-30
  • 项目状态:
    已结题

项目摘要

This proposal addresses the new phenomenon of crystal-crystal phase transformation and amorphization that can occur through virtual melting at temperatures significantly below (1000K) the melting temperature. Some indications were found that virtual melting may serve as mechanisms of various structural changes: plastic flow under high strain rate loading of metals and metallic nanowires, fracturing, and sublimation. The objective of this project is to develop multiple theoretical and computational approaches (coupled to experiment) to study the main features of virtual melting, and to explore the generality of the phenomena in various applications. General continuum thermodynamic and kinetic theories, as well as phase field theory and quantitative models, will be developed and applied to simulations of phase transformations, plastic flow under high strain-rate loading, fracture, and sublimation via virtual melting. Molecular dynamics simulations for the same phenomena and materials will be performed. New mechanisms related to virtual melting are expected in various material systems, e.g., for phase transformation in HMX explosive, pharmaceuticals, and commercial nonlinear optical media and for high-pressure amorphization in geological, electronic, and superhard materials. Understanding the mechanism-based kinetics will lead to ability to control the transformations and look for hidden phases that need to be accessed (or avoided). One graduate student will be trained. Intense interdisciplinary collaboration will be developed. The PI will develop a new graduate course on multiscale modeling of phase transformations (available via distance learning) and will organize symposia devoted to the phase transformations.
该建议解决了晶体-晶体相变和非晶化的新现象,其可以通过在显著低于熔化温度(1000 K)的温度下的虚拟熔化而发生。 一些迹象表明,虚拟熔化可能作为各种结构变化的机制:高应变率加载下的金属和金属纳米线,断裂和升华的塑性流动。该项目的目标是开发多种理论和计算方法(结合实验)来研究虚拟熔化的主要特征,并探索该现象在各种应用中的普遍性。一般连续热力学和动力学理论,以及相场理论和定量模型,将开发和应用于模拟相变,高应变率载荷下的塑性流动,断裂和升华通过虚拟熔化。将对相同的现象和材料进行分子动力学模拟。在各种材料系统中,例如,用于HMX炸药、药物和商业非线性光学介质中的相变,以及地质、电子和超硬材料中的高压非晶化。理解基于机制的动力学将导致控制转换的能力,并寻找需要访问(或避免)的隐藏阶段。将培养一名研究生。将加强跨学科合作。PI将开发一个新的研究生课程的相变多尺度建模(可通过远程学习),并将组织专题讨论会致力于相变。

项目成果

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Valery Levitas其他文献

Valery Levitas的其他文献

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{{ truncateString('Valery Levitas', 18)}}的其他基金

New Rules for Coupled Severe Plastic Deformations, Phase Transformations, and Structural Changes in Metals under High Pressure
高压下金属耦合严重塑性变形、相变和结构变化的新规则
  • 批准号:
    2246991
  • 财政年份:
    2023
  • 资助金额:
    $ 30万
  • 项目类别:
    Standard Grant
Plasticity, Phase Transformations, and their Interaction under High Pressure in Silicon
硅中的塑性、相变及其在高压下的相互作用
  • 批准号:
    1943710
  • 财政年份:
    2020
  • 资助金额:
    $ 30万
  • 项目类别:
    Standard Grant
Deformation of Metals under High Pressure: Multiscale Stress Fields, Plasticity, and Phase Transformations
高压下金属的变形:多尺度应力场、塑性和相变
  • 批准号:
    1904830
  • 财政年份:
    2019
  • 资助金额:
    $ 30万
  • 项目类别:
    Continuing Grant
DMREF/Collaborative Research: Multiscale Theory and Experiment in Search for and Synthesis of Novel Nanostructured Phases in BCN Systems
DMREF/合作研究:在 BCN 系统中寻找和合成新型纳米结构相的多尺度理论和实验
  • 批准号:
    1434613
  • 财政年份:
    2014
  • 资助金额:
    $ 30万
  • 项目类别:
    Standard Grant
Melt-Dispersion Mechanism for Energetic Reactions of Aluminum Nanoparticles
铝纳米粒子高能反应的熔融分散机制
  • 批准号:
    1104518
  • 财政年份:
    2010
  • 资助金额:
    $ 30万
  • 项目类别:
    Standard Grant
Melt-Dispersion Mechanism for Energetic Reactions of Aluminum Nanoparticles
铝纳米粒子高能反应的熔融分散机制
  • 批准号:
    0755236
  • 财政年份:
    2008
  • 资助金额:
    $ 30万
  • 项目类别:
    Standard Grant
Stress-Induced Virtual Melting as a New Mechanism of Solid-Solid Phase Transformations and Stress Relaxation
应力诱导虚拟熔化作为固-固相变和应力松弛的新机制
  • 批准号:
    0555909
  • 财政年份:
    2006
  • 资助金额:
    $ 30万
  • 项目类别:
    Standard Grant
Continuum Mechanical and Micromechanical Fundamentals of Mechanochemistry of Energetic Materials
含能材料机械化学的连续力学和微机械基础
  • 批准号:
    0201108
  • 财政年份:
    2002
  • 资助金额:
    $ 30万
  • 项目类别:
    Standard Grant

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