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.

为下一代核反应堆发现能够经受高温和高剂量辐射的先进材料的需求很大。在这些操作条件下，大量的金属材料产生空洞，导致脆化和随之而来的破坏。空洞膨胀是由于辐射引起原子缺陷迁移到其他地方，留下空穴团。这些空位团簇形成空洞并不断生长。然而，主要研究人员的初步研究显示了相反的现象：即，在辐射过程中，具有纳米级孔隙的金属中的空隙会缩小而不是扩大。这项研究将调查这一现象，并可能从根本上增加对减轻辐射损伤的基本机制的理解。一个积极的结果将加强先进核能系统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的科学家合作，将为研究生提供在一流国家实验室的暑期研究经验。本项目旨在通过模型和实验相结合的方法，了解在纳米多孔金属材料中引入纳米孔洞吸收和消除辐射引起的点缺陷的基本机制，最终显著减少孔洞膨胀，减轻辐射脆化。本文提出的创新概念是利用纳米空洞及其应力场捕获、储存和湮灭与辐射损伤相关的各种缺陷物种，并恢复连续吸收缺陷的能力的可能性。此外，纳米多孔金属可能具有增强的塑性与辐射脆经常观察到的块状全致密对应。本研究将原位辐射实验与相场模拟相结合，研究孔隙膨胀动力学；将原位纳米力学测试与位错动力学模拟相结合，研究辐照后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

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

In situ studies on irradiation resistance of nanoporous Au through temperature-jump tests

• DOI: 10.1016/j.actamat.2017.09.054
• 发表时间: 2018-01-15
• 期刊: ACTA MATERIALIA
• 影响因子: 9.4
• 作者: Li, Jin;Fan, C.;Zhang, X.
• 通讯作者: Zhang, X.

Dual Beam In Situ Radiation Studies of Nanocrystalline Cu

• DOI: 10.3390/ma12172721
• 发表时间: 2019-08
• 期刊: Materials
• 影响因子: 3.4
• 作者: C. Fan;Z. Shang;T. Niu;Jin Li;Haiyan Wang;Xinghang Zhang

In situ study on enhanced heavy ion irradiation tolerance of porous Mg

• DOI: 10.1016/j.scriptamat.2017.09.018
• 发表时间: 2018-02-01
• 期刊: SCRIPTA MATERIALIA
• 影响因子: 6
• 作者: Li, Jin;Chen, Y.;Zhang, X.
• 通讯作者: Zhang, X.