物理约束的He-H离子注入4H-SiC辐照诱导应变纳米压痕与有限元建模逆估计
Physics-Constrained Inverse Estimation of Irradiation-Induced Strain in He-H Ion-Implanted 4H-SiC Using Nanoindentation and Finite Element Modeling
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中文总结 AI 辅助
本研究提出物理约束逆建模方法，结合纳米压痕和有限元模拟，估算He-H离子注入4H-SiC的辐照诱导应变，峰值应变0.91，经N-PED验证，为核陶瓷损伤评估提供实用工具。
中文摘要 AI 辅助
纳米压痕技术被广泛用于评估辐照材料的力学性能，但其在量化辐照诱导亚表面应变方面的潜力仍未得到充分探索。本研究采用一种基于物理约束逆建模方法的集成实验-数值框架，估算单晶4H-SiC在依次进行He和H离子注入后随深度变化的辐照诱导应变分布的幅值。该方法结合深度传感纳米压痕、有限元建模（FEM）和基于单纯形的逆优化程序，校准由离子损伤模拟推导出的具有物理动机的本征应变分布。假设应变场遵循对数正态分布，与独立确定的损伤分布（SRIM）一致，并通过随深度变化的热膨胀公式在有限元模型中实现。通过最小化模拟与实验力-位移曲线之间的平方误差，估算峰值拉伸应变为0.91，伴随有效杨氏模量为310 GPa，屈服强度为16.4 GPa。使用纳米束旋进电子衍射（N-PED）进行的独立验证证实，重建的离面应变分布与实验测量的结果在幅值和空间分布上均具有良好一致性。结果表明，纳米压痕结合基于物理的逆建模，可为量化核陶瓷中辐照诱导应变和残余应力提供实用工具。该方法为评估先进核系统相关离子辐照材料中亚表面损伤提供了基于衍射技术的补充途径。
英文摘要
Nanoindentation is widely used to evaluate the mechanical properties of irradiated materials however its potential for quantifying irradiation induced subsurface strain remains underexplored. In this work, an integrated experimental numerical framework based on a physics constrained inverse modeling approach is employed to estimate the magnitude of a depth dependent irradiation induced strain distribution in single crystal 4H SiC following sequential He and H ion implantation. The approach combines depth sensing nanoindentation, finite element modeling FEM, and a simplex based inverse optimization routine to calibrate a physically motivated eigenstrain profile derived from ion damage simulations. The strain field is assumed to follow a lognormal distribution consistent with independently determined damage profiles SRIM, and is implemented in the FEM model through a depth dependent thermal expansion formulation. By minimizing the squared error between simulated and experimental force displacement curves, the peak tensile strain is estimated to be 0.91, accompanied by an effective Young s modulus of 310 GPa and a yield strength of 16.4 GPa. Independent validation using nano beam precession electron diffraction N PED confirms good agreement between the reconstructed and experimentally measured out of plane strain profiles in both magnitude and spatial distribution. The results demonstrate that nanoindentation, when combined with physics based inverse modeling, can provide a practical tool for quantifying irradiation-induced strain and residual stress in nuclear ceramics. This methodology offers a complementary approach to diffraction based techniques for assessing subsurface damage in ion irradiated materials relevant to advanced nuclear systems.
发表机构
- Department of Control Engineering, Faculty of Electrical Engineering, Czech Technical University in Prague（捷克布拉格捷克理工大学电气工程学院控制工程系）
- Institute of Physics of the Czech Academy of Sciences（捷克科学院物理研究所）
- State Key Laboratory for Environment-friendly Energy Materials, Southwest University and Technology（西南科技大学环境友好能源材料国家重点实验室）
- IPFN, Instituto Superior Técnico, Universidade de Lisboa（里斯本大学高等理工学院核能和平利用研究所）
- State Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences（中国科学院上海微系统与信息技术研究所集成电路材料国家重点实验室）
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research（德累斯顿-罗森多夫亥姆霍兹中心离子束物理与材料研究所）
- Department of Materials Science & Engineering, University of Tennessee（田纳西大学材料科学与工程系）
- School of Engineering, University of Southampton（南安普顿大学工程学院）
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