Mechanics and Kinetics of Void Swelling in Irradiated Nanoporous Materials

辐照纳米多孔材料中空隙膨胀的力学和动力学

• 批准号: 1728419
• 负责人: Xinghang Zhang
• 金额: $ 53.93万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-09-01 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1728419&HistoricalAwards=false
• 关键词: Mechanics; Kinetics; Void; Swelling; Irradiated

There is a significant demand for the discovery of advanced materials that can survive high temperature and high-dose radiations for next generation nuclear reactors. Under these operating conditions, a large number of metallic materials develop voids that result in embrittlement and consequent failure. Void swelling occurs as radiation induces atomic defects that migrate elsewhere leaving clusters of vacant positions behind. These vacancy clusters form voids and grow continuously. The principal investigators' initial study shows just the opposite phenomenon, however: that is, voids in metals with existing nanoscale pores shrink rather than expand during radiation. This research will investigate this phenomenon and may add radically to the understanding of fundamental mechanisms of radiation damage mitigation. A positive outcome will enhance the design of radiation tolerant nanoporous materials for advanced nuclear energy systems. In this project, special effort will be made to recruit female and other minority students. Additionally, collaborations with scientists at Argonne National Laboratories and Los Alamos National Laboratory will offer graduate students summer research experience at premier national labs. The goal of this project is to understand, via a combination of modeling and experiments, the fundamental mechanisms through which deliberately introduced nanovoids in nanoporous metallic materials can absorb and eliminate radiation induced point defects, and ultimately curtail void swelling significantly and alleviate radiation embrittlement. The innovative concepts put forward here are the possibility of utilizing nanovoids and their stress field to trap, store and annihilate various defect species associated with radiation damage, and restore the capability to absorb defects continuously. Furthermore, nanoporous metals may have enhanced plasticity in comparison to radiation embrittlement frequently observed in bulk fully-dense counterparts. This study integrates in situ radiation experiments with phase field modeling to investigate the kinetics of void swelling, and combine in situ nanomechanical testing with dislocation dynamics modeling to explore mechanics and plasticity of irradiated nanoporous metals.

下一代核反应堆迫切需要发现能够承受高温和高剂量辐射的先进材料。在这些操作条件下，大量金属材料会产生空隙，导致脆化并随之发生故障。当辐射引起原子缺陷迁移到其他地方并留下空位簇时，就会发生空洞膨胀。这些空位簇形成空隙并不断生长。然而，主要研究人员的初步研究显示了相反的现象：即，具有纳米级孔隙的金属中的空隙在辐射过程中收缩而不是扩张。这项研究将调查这一现象，并可能从根本上增进对减轻辐射损伤基本机制的理解。积极的成果将增强先进核能系统的耐辐射纳米多孔材料的设计。在这个项目中，将特别努力招收女性和其他少数民族学生。此外，与阿贡国家实验室和洛斯阿拉莫斯国家实验室科学家的合作将为研究生提供在顶级国家实验室的暑期研究经验。该项目的目标是通过建模和实验相结合，了解在纳米多孔金属材料中故意引入纳米空隙可以吸收和消除辐射引起的点缺陷，并最终显着减少空隙膨胀并减轻辐射脆化的基本机制。这里提出的创新概念是利用纳米空隙及其应力场来捕获、存储和消灭与辐射损伤相关的各种缺陷物质，并恢复连续吸收缺陷的能力。此外，与在块状全致密对应物中经常观察到的辐射脆化相比，纳米多孔金属可能具有增强的可塑性。本研究将原位辐射实验与相场建模相结合，研究空隙膨胀的动力学，并将原位纳米力学测试与位错动力学建模相结合，探索辐照纳米多孔金属的力学和塑性。

项目成果

The influence of helium and heavy ion irradiations on radiation responses of single crystal Cu with nanovoids: An in situ TEM study

氦和重离子辐照对纳米空隙单晶铜辐射响应的影响：原位 TEM 研究

• DOI: 10.1016/j.actamat.2022.118293
• 发表时间: 2022-08-01
• 期刊: Acta Materialia
• 影响因子: 9.4
• 作者: C. Fan;Z. Shang;Meimei Li;Haiyan Wang;A. El;Xinghang Zhang
• 通讯作者: Xinghang Zhang

In situ study on heavy ion irradiation induced microstructure evolution in single crystal Cu with nanovoids at elevated temperature

高温下重离子辐照诱导纳米孔单晶铜微观结构演化的原位研究

• DOI: 10.1016/j.mtcomm.2022.104418
• 发表时间: 2022-12
• 期刊: Materials Today Communications
• 影响因子: 3.8
• 作者: Niu, Tongjun;Rayaprolu, Sreekar;Shang, Zhongxia;Sun, Tianyi;Fan, Cuncai;Zhang, Yifan;Shen, Chao;Nasim, Md;Chen, Wei;Li, Meimei;et al
• 通讯作者: et al

Superior twin stability and radiation resistance of nanotwinned Ag solid solution alloy

纳米孪晶银固溶体合金具有优异的孪晶稳定性和抗辐射性能

• DOI: 10.1016/j.actamat.2018.03.052
• 发表时间: 2018-06-01
• 期刊: Acta Materialia
• 影响因子: 9.4
• 作者: Jin Li;D. Xie;S. Xue;C. Fan;Youxing Chen;H. Wang;Jian Wang;Xinghang Zhang
• 通讯作者: Xinghang Zhang

Defect evolution in heavy ion irradiated nanotwinned Cu with nanovoids

重离子辐照具有纳米空隙的纳米孪晶铜中的缺陷演化

• DOI: 10.1016/j.jnucmat.2017.09.031
• 发表时间: 2017-12-01
• 期刊: Journal of Nuclear Materials
• 影响因子: 3.1
• 作者: C. Fan;Youxing Chen;Jin Li;Jie Ding;Haiyan Wang;Xinghang Zhang
• 通讯作者: Xinghang Zhang

Thermal stability of immiscible Cu-Ag/Fe triphase multilayers with triple junctions

具有三联结的不混溶 Cu-Ag/Fe 三相多层膜的热稳定性

• DOI: 10.1016/j.actamat.2021.116679
• 发表时间: 2021-04-15
• 期刊: Acta Materialia
• 影响因子: 9.4
• 作者: T. Niu;Yifan Zhang;Jaehun Cho;Jin Li;Haiyan Wang;Xinghang Zhang
• 通讯作者: Xinghang Zhang