Understanding Intrinsic Ductility in Metallic Glasses

了解金属玻璃的固有延展性

• 批准号: 1207439
• 负责人: Yunfeng Shi
• 金额: $ 26.38万
• 依托单位: Rensselaer Polytechnic Institute
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-06-15 至 2016-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1207439&HistoricalAwards=false
• 关键词: Understanding; Intrinsic; Ductility; Metallic; Glasses

TECHNICAL SUMMARYThis award supports computational and theoretical research and education to advance understanding of the intrinsic ductility of metallic glasses. The conditions and manner in which materials fail are of fundamental concerns to both engineers and scientists. Recently an empirical relation has been found between the Poisson's ratio and the fracture energy in amorphous solids, including metallic glasses and oxide glasses. However, there is little theoretical understanding for such a convenient and intriguing correlation between near-equilibrium elasticity and far-from-equilibrium failure. The PI will use molecular dynamics simulation coupled with potential-tuning scheme to investigate the intrinsic ductility of metallic glasses, as a prototypical amorphous solid. Such strategy will enable the exploration of amorphous solids unavailable in experiments by prescribing atomic interactions. Both the Poisson's ratio and the fracture energy will be studied in terms of the atomic bonding and packing. The knowledge of how structure determines intrinsic ductility is crucial to toughening metallic glasses and even oxide glasses. The computational platform developed in this project can be used to conduct dynamic fracture and fatigue testings, and to study fracture toughness of thin films, porous materials and composite materials. Insights gained here will also provide important clues on other empirical relations linking the Poisson's ratio to densification, fragility and glass-transition.The PI will reach out to high school students interested in science and engineering through the New Visions: Math, Engineering, Technology & Science program in collaboration with Rensselaer Polytechnic Institute. Planned activities include half-day mini-lectures on computational materials science, complemented with interactive demonstrations. The PI will also reach out to the computational research community by continuing developing open-source visualization software SimRePlay.NON-TECHNICAL SUMMARYThis award supports computational and theoretical research and education to understand how amorphous solid materials fail. The touch screens of smart phones, made of oxide glasses, are brittle as they shatter upon impact, while glasses constituted with metal atoms, termed metallic glasses, can be as tough as steels. The PI will use advanced computer simulation techniques to model the fracture of various amorphous solids. The insights gained from computational work at the atomic level will help understand and predict the failure mode of amorphous solids, and provide important clues of how to make tough glasses.The PI will reach out to high school students interested in science and engineering through the New Visions: Math, Engineering, Technology & Science program in collaboration with Rensselaer Polytechnic Institute. Planned activities include half-day mini-lectures on computational materials science, complemented with interactive demonstrations. The PI will also reach out to the computational research community by continuing developing open-source visualization software SimRePlay.

该奖项支持计算和理论研究和教育，以促进对金属玻璃固有延展性的理解。材料失效的条件和方式是工程师和科学家最关心的问题。近年来，在金属玻璃和氧化玻璃等非晶态固体中发现了泊松比与断裂能之间的经验关系。然而，对于近平衡弹性和远平衡破坏之间的这种方便而有趣的关联，几乎没有理论理解。PI将使用分子动力学模拟结合电位调谐方案来研究金属玻璃的固有延展性，作为一种典型的非晶态固体。这种策略将使探索实验中无法通过规定原子相互作用的非晶固体成为可能。泊松比和断裂能都将从原子键合和堆积的角度进行研究。结构如何决定固有延展性的知识对金属玻璃甚至氧化玻璃的增韧至关重要。本项目开发的计算平台可以进行动态断裂和疲劳试验，研究薄膜、多孔材料和复合材料的断裂韧性。在这里获得的见解也将为将泊松比与致密化、脆性和玻璃化转变联系起来的其他经验关系提供重要线索。PI将通过与伦斯勒理工学院合作的“新视野：数学、工程、技术与科学”项目，向对科学和工程感兴趣的高中生伸出援助之手。计划的活动包括半天的计算材料科学迷你讲座，辅以互动演示。PI还将通过继续开发开源可视化软件SimRePlay来接触计算研究社区。该奖项支持计算和理论研究和教育，以了解非晶固体材料是如何失败的。智能手机的触摸屏是由氧化玻璃制成的，很脆弱，一受到冲击就会破碎，而由金属原子构成的玻璃，被称为金属玻璃，可以像钢一样坚韧。PI将使用先进的计算机模拟技术来模拟各种非晶固体的断裂。从原子水平的计算工作中获得的见解将有助于理解和预测非晶固体的破坏模式，并为如何制造坚韧的玻璃提供重要线索。PI将通过与伦斯勒理工学院合作的“新视野：数学、工程、技术与科学”项目，向对科学和工程感兴趣的高中生伸出援助之手。计划的活动包括半天的计算材料科学迷你讲座，辅以互动演示。PI还将通过继续开发开源可视化软件SimRePlay来接触计算研究社区。

项目成果

The dynamics of shear band propagation in metallic glasses

• DOI: 10.1016/j.actamat.2023.118787
• 发表时间: 2023-02-28
• 期刊: ACTA MATERIALIA
• 影响因子: 9.4
• 作者: Luo，Jian;Huang，Liping;Deng，Binghui
• 通讯作者: Deng，Binghui