权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

DMREF: Grain Growth Beyond Isotropic Models: Microstructure Evolution with Experimentally-Derived Interface Properties

DMREF：超越各向同性模型的晶粒生长：具有实验衍生界面属性的微观结构演化

基本信息

批准号：
1628994
负责人：
Gregory Rohrer
金额：
$ 156.16万
依托单位：
Carnegie-Mellon University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2016
资助国家：
美国
起止时间：
2016-10-01 至 2021-09-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1628994&HistoricalAwards=false
关键词：
DMREF Grain Growth Beyond Isotropic

项目摘要

NON-TECHNICAL DESCRIPTION: Nearly all man-made solids are made up of many small crystals referred to as grains. The sizes of these grains and the way that they are attached - characteristics determined when the material is made - influence many of the solid's properties. Existing models for the evolution of the grains during processing fail to predict observed outcomes. Because of the complexity of the problem, it is not even obvious that it is possible to make accurate predictions of how grains evolve during processing. The research will test the hypothesis that it is possible to predict the evolution of the grains within a material if information about the properties of the interfaces between the grains is included. The research will couple simulations with newly developed experimental techniques to test the hypothesis. Methods will be employed to identify where current models are insufficient, how they can be improved, and the degree to which it will be possible to predict grain evolution. The broader impact of this research is that the ability to predict how grains change during processing will make it possible to avoid trial and error experimentation and develop improved materials more quickly and at a lower cost.TECHNICAL DESCRIPTION: Predicting exactly how microstructures evolve during thermal annealing is one of the longstanding problems in materials science. While it is known how the average grain size will change with annealing, very little is known about the evolution of the grain boundary character distribution, the texture, and the grain shape. The main assertion of this research is that with knowledge of the grain boundary properties and how the properties vary with the crystallography of the grain boundary, it will be possible to predict how the microstructure will change during grain growth. A continuous feedback cycle of observations, simulation, comparison, and correction will be employed with the objective of creating accurate, predictive models for grain growth. The research will focus on materials with a range of anisotropic grain boundary properties. Ferritic iron has the most isotropic properties. The grain boundary properties of strontium titanate vary mostly with respect to grain boundary plane orientation. The grain boundary properties of nickel are anisotropic with respect to both lattice misorientation and grain boundary plane orientation. The studies of three-dimensional microstructure evolution in this research will make it possible to test proposed mechanisms for the development of anisotropic grain boundary character distributions and grain growth stagnation.

非技术性描述：几乎所有人造固体都是由许多称为颗粒的小晶体组成的。这些颗粒的大小和它们附着的方式--材料制造时确定的特性--影响固体的许多性质。现有的模型在加工过程中的颗粒的演变未能预测观察到的结果。由于问题的复杂性，甚至不可能准确预测加工过程中颗粒的演变。这项研究将检验这样一种假设，即如果包含有关颗粒之间界面特性的信息，就有可能预测材料中颗粒的演变。这项研究将把模拟与新开发的实验技术结合起来，以验证这一假设。将采用方法来确定当前模型的不足之处，如何改进它们，以及在何种程度上可以预测晶粒演变。这项研究的更广泛的影响是，预测加工过程中晶粒如何变化的能力将使避免反复试验成为可能，并以更低的成本更快地开发出改进的材料。技术描述：准确预测热退火过程中微观结构如何演变是材料科学中长期存在的问题之一。虽然它是已知的平均晶粒尺寸将如何随着退火而变化，很少有人知道的晶界特征分布，纹理和晶粒形状的演变。这项研究的主要主张是，随着知识的晶界属性和属性如何随晶界的晶体学变化，它将有可能预测微观结构将如何在晶粒生长过程中发生变化。将采用观察、模拟、比较和校正的连续反馈循环，目的是为晶粒生长创建准确的预测模型。研究将集中在具有一系列各向异性晶界特性的材料上。铁素体铁具有最各向同性的性质。钛酸锶的晶界性质的变化主要与晶界平面取向有关。镍的晶界性质相对于晶格取向差和晶界平面取向是各向异性的。在这项研究中的三维微观结构演变的研究将有可能测试各向异性晶界特征分布和晶粒生长停滞的发展提出的机制。

项目成果

期刊论文数量（5）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Comparison of simulated and measured grain volume changes during grain growth

晶粒生长过程中模拟和测量的晶粒体积变化的比较

DOI：
10.1103/physrevmaterials.6.033402
发表时间：
2022
期刊：
Physical Review Materials
影响因子：
3.4
作者：
Peng, Xiaoyao;Bhattacharya, Aditi;Naghibzadeh, S. Kiana;Kinderlehrer, David;Suter, Robert;Dayal, Kaushik;Rohrer, Gregory S.
通讯作者：
Rohrer, Gregory S.

Surface Growth in Deformable Solids using an Eulerian Formulation

使用欧拉公式在可变形固体中进行表面生长

DOI：
10.1016/j.jmps.2021.104499
发表时间：
2021
期刊：
Journal of the mechanics and physics of solids
影响因子：
5.3
作者：
Naghibzadeh, Kiana;Walkington, Noel;Dayal, Kaushik
通讯作者：
Dayal, Kaushik

Energetic Formulation of Large-Deformation Poroelasticity

大变形多孔弹性的能量公式

DOI：
10.31223/x5m335
发表时间：
2022
期刊：
International journal for numerical and analytical methods in geomechanics
影响因子：
4
作者：
Karimi, Mina;Massoudi, Mehrdad;Walkington, Noel;Pozzi, Matteo;Dayal, Kaushik
通讯作者：
Dayal, Kaushik

Effective response of heterogeneous materials using the recursive projection method

使用递归投影方法有效响应异质材料