Zhu Yichao

Professor   Supervisor of Doctorate Candidates   Supervisor of Master's Candidates

Gender:Male

Alma Mater:University of Oxford

Degree:Doctoral Degree

School/Department:Department of Engineering Mechanics

Discipline:Solid Mechanics. Applied Mathematics

Business Address:Room 523, 1st Lab Building

E-Mail:yichaozhu@dlut.edu.cn


Paper Publications

Point defect sink efficiency of low-angle tilt grain boundaries

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Indexed by:期刊论文

Date of Publication:2017-04-01

Journal:JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS

Included Journals:SCIE、EI、Scopus

Volume:101

Page Number:166-179

ISSN No.:0022-5096

Key Words:Grain boundaries; Point defects; Sink efficiency; Dislocation climb; Irradiation

Abstract:We examine the common assumption that grain boundaries (GBs) are ideal (or perfect) sinks for point defects by comparing and contrasting its implications with an explicit model of a low-angle tilt GB described by an array of edge dislocations which annihilate point defects by climbing. We solve the resultant diffusion equation in the absence and presence of irradiation-induced point defects. The GB sink efficiency depends on the physical parameters describing the boundary geometry (i.e., misorientation), material properties, and/or irradiation conditions (point defect generation and annihilation within the interior of grains). When the constituent dislocation spacing is small (large misorientation), the GB sink efficiency approaches that of the ideal sink. However, for small misorientations, the GB sink efficiency drops rapidly to zero and the ideal sink assumption for the GB fails dramatically. We derive a reduced dimension description of GBs where the influence of GB structure is captured in a single parameter in a Robin boundary condition for the diffusion equation. For the case of a low-angle tilt GB, we explicitly relate this parameter to the GB structure. We discuss the generality of this approach for cases where the low-angle GB model applies and parameterize the model so that it accurately reproduces the results of the two-dimensional dislocation model. The applicability of the approach to more general GBs is discussed as well as the implication of these results for predicting grain size effects under irradiation conditions. (C) 2017 Elsevier Ltd. All rights reserved.

Pre One:Additive Manufacturing-Oriented Design of Graded Lattice Structures Through Explicit Topology Optimization

Next One:Homognenisation of a row of dislocation dipoles from discrete dislocation dynamics

Profile

招生信息

 

招生类别:(计划20232024年秋季入学)

    博士研究生1名、硕士研究2名。有意向者欢迎邮件联系:yichaozhu@dlut.edu.cn

 

导师信息:

朱一超,大连理工大学工程力学系教授,博士生导师,国家级人才项目青年项目入选者。本科毕业于复旦大学,于牛津大学获得博士学位。致力于“基于微观,预测宏观”的跨尺度建模分析研究。相关研究成果主要应用于核材料、3D打印、复合材料研发等国际前沿技术或国家重大需求领域。在固体力学旗舰期刊JMPS上发表论文近10篇,另有工作发表于PRLCMAMEScripta Materialia等物理学计算力学或材料学顶级期刊。同时与中国核动力研究设计院等单位深度合作,将研究成果应用于工程实践。

 

育人理念:

帮助学生完成从“学习者”到“研究者”的角色转换。注重学与思结合的科研方式,学生有充分的自由进行探索,同时安排定期讨论,答疑解惑;注重交流,承诺为博士生提供参加高水平国际会议或海内外顶尖学府(如牛津大学、约翰霍普金斯大学等)访问交流的机会,为所有学生提供在海内外学术会议介绍个人研究成果的机会;注重科研与生活的平衡,参考学部最高标准发放科研津贴,鼓励学生在工作方向明确的情况下自主分配科研-休假时间。

 

毕业愿景:

ü 之于博士生,帮助您在跨尺度建模领域形成国际前沿视角,在您努力的前提下,力争让本科直博/硕博连读生5年完成学业,已有硕士学位的学生3-4年完成学业,发表高水平第一作者论文3篇以上,为您未来找工作搭建高水平的平台;

ü 之于希望继续深造的硕士生,会按博士标准培养,发表科研论文,并全力推荐往海内外高校继续深造;

ü 之于希望去工业界的硕士生,将参与横向课题,向对口的国家级科研单位的推荐工作机会。

 

研究方向:

    课题组致力于推动经典渐近分析方法与新兴机器学习算法深度融合,以微观机制视角分析材料宏观行为,发展高效保真数值模拟方法,为材料复杂跨尺度行为的预测提供扎实的理论保障与高效的仿真工具。具体包括:

a)     以晶体微结构演化视角发展辐照环境下材料力学行为仿真模型;

b)     合金材料内部元素演化与其宏观性能定量关系研究;

c)     3D打印复杂构型宏观物理性质建模分析;

d)     其它跨尺度系统(如复合材料等)之数学建模与模拟仿真研究。

 

一些要求:

a)     目标清晰,有科研热情,对编程不排斥

b)     力学、数学、物理、计算机专业优先

c)     先修课程:数学物理方法、弹性力学、计算方法

d)     有一定的英文基础