CAREER: Understanding of Intrinsic Size-Effects in Deformation of Metallic Glasses

职业：了解金属玻璃变形的内在尺寸效应

• 批准号: 1921435
• 负责人: Golden Kumar
• 金额: $ 41.09万
• 依托单位: University of Texas at Dallas
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-12-19 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1921435&HistoricalAwards=false
• 关键词: CAREER; Understanding; Intrinsic; Size; Effects

Metallic glasses have potential as future engineering materials in structural and biomedical applications, due to their high strength and elasticity, which can surpass the best available steels. These unusual properties stem from the synergistic effect of metallic bonding and the glassy structure. Despite the impressive suite of properties, barriers exist to the adoption of metallic glasses into application, including failure in tension and high material cost. Adoption of metallic glasses into wide application could be made possible if brittle fracture could be understood and controlled. This Early Career Faculty Development (CAREER) Program research project will contribute to these efforts by uncovering the mechanism of ductility observed in nanoscale samples and harnessing the advantages of size reduction (lower cost, enhanced plasticity, and ease in fabrication) in novel applications. The research efforts will be integrated with comprehensive education and outreach activities. A new summer-enrichment program, for the first time in the region, will provide exposure and tools to the underserved population of students with special needs, to promote a successful career in engineering disciplines. The results and materials from this project will be disseminated through web-based services, public exhibits, conferences, and journal publications.Size-dependent transitions from shear-localized (brittle) to homogeneous (ductile) deformation can eradicate the fundamental weakness of metallic glasses. However, the existence and the mechanism of such size effects themselves have been difficult to discern due to processing artifacts (irradiation damage, variation in thermal history, and noncompliant sample geometry) and low yield of existing nanomechanical tests. This award supports fundamental research to decouple the effects of sample size and processing on deformation of metallic glasses. This will be achieved by devising high-throughput fabrication and mechanical testing methodologies for irradiation-free nanoscale specimens (compression and tensile). Statistically significant and unambiguous data obtained from these experiments will allow verification and refinement of existing models for plasticity in nanoscale metallic glasses. The benefits of size-effects will be utilized in unique applications such as electrodes for sensing, micro-needles for drug delivery, and conductive tips for scanning probe microscopy. The overall research plan is designed to stimulate a paradigm shift in metallic glass research from bulk to small-scale by demonstrating its impact on the fundamental and applied science.

金属玻璃由于其高强度和高弹性，可以超越现有的最佳钢材，因此在结构和生物医学应用中具有作为未来工程材料的潜力。这些不寻常的性质源于金属键和玻璃结构的协同作用。尽管具有令人印象深刻的一系列性能，但采用金属玻璃的应用存在障碍，包括张力失效和高材料成本。认识和控制金属玻璃的脆性断裂，可以使金属玻璃的广泛应用成为可能。这个早期职业教师发展（Career）计划的研究项目将通过揭示在纳米尺度样品中观察到的延性机制，并在新应用中利用缩小尺寸的优势（更低的成本，增强的可塑性和易于制造），为这些努力做出贡献。研究工作将与全面的教育和外联活动结合起来。一项新的夏季充实项目将首次在该地区为服务不足、有特殊需求的学生提供机会和工具，以促进他们在工程学科领域取得成功。该项目的成果和材料将通过网络服务、公开展览、会议和期刊出版物进行传播。从剪切局部（脆性）到均匀（延性）变形的尺寸依赖转变可以消除金属玻璃的基本弱点。然而，由于加工伪影（辐照损伤、热历史变化和样品几何形状不符合）和现有纳米力学测试的低良率，这种尺寸效应本身的存在和机制一直难以辨别。该奖项支持基础研究，以解耦样品大小和加工对金属玻璃变形的影响。这将通过设计无辐照纳米级样品（压缩和拉伸）的高通量制造和机械测试方法来实现。从这些实验中获得的统计意义和明确的数据将允许验证和改进纳米级金属玻璃塑性的现有模型。尺寸效应的好处将在独特的应用中得到利用，例如用于传感的电极、用于药物输送的微针和用于扫描探针显微镜的导电尖端。总体研究计划旨在通过展示其对基础科学和应用科学的影响，刺激金属玻璃研究从批量到小规模的范式转变。

项目成果

Review of Thermoplastic Drawing with Bulk Metallic Glasses

• DOI: 10.3390/met12030518
• 发表时间: 2022-03
• 期刊: Metals
• 影响因子: 2.9
• 作者: S. Jagdale;Akib Jabed;S. Theeda;C. Meduri;Zhonglue Hu;Molla Hasan;G. Kumar

Effect of time on the isothermal viscosity of metallic glass supercooled liquids

时间对金属玻璃过冷液体等温粘度的影响

• DOI: 10.1016/j.jallcom.2020.158067
• 发表时间: 2021
• 期刊: Journal of Alloys and Compounds
• 影响因子: 6.2
• 作者: Jabed, Akib;Meduri, Chandra Sekhar;Kumar, Golden
• 通讯作者: Kumar, Golden

Biocompatibility and thermoplastic formability of Pt-based metallic glasses

铂基金属玻璃的生物相容性和热塑性成型性

• DOI: 10.1016/j.matlet.2021.129870
• 发表时间: 2021
• 期刊: Materials Letters
• 影响因子: 3
• 作者: Jagdale, S.;Hu, Q.;Ecker, M.;Kumar, G.
• 通讯作者: Kumar, G.

Selective-area fabrication of bulk metallic glass nanowires on silicon

硅上块体金属玻璃纳米线的选择性区域制造

• DOI: 10.1016/j.matlet.2022.132966
• 发表时间: 2022
• 期刊: Materials Letters
• 影响因子: 3
• 作者: Theeda, Sumanth;Kumar, Golden
• 通讯作者: Kumar, Golden

Comparative Tribological Properties of Pd-, Pt-, and Zr-Based Bulk Metallic Glasses

Pd、Pt 和 Zr 基块体金属玻璃的摩擦学性能比较

• DOI: 10.3390/lubricants8090085
• 发表时间: 2020
• 期刊: Lubricants
• 影响因子: 3.5
• 作者: Medina, Marco A.;Acikgoz, Ogulcan;Rodriguez, Anthony;Meduri, Chandra S.;Kumar, Golden;Baykara, Mehmet Z.
• 通讯作者: Baykara, Mehmet Z.