Nanoscale Characterization and Aim-Specific Design of Amorphous Materials

非晶材料的纳米级表征和特定目标设计

• 批准号: RGPIN-2021-02544
• 负责人: Dagdeviren, Omur
• 金额: $ 2.33万
• 依托单位: École de technologie supérieure
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=754425
• 关键词: Nanoscale; Characterization; Aim; Specific; Design

Properties of materials are being explored both for fundamental research and engineering applications. Specifically, mechanical properties of materials (e.g., strength, stiffness, and deformation) are important for all aspects of human civilization, including energy, transportation, and communication. However, the existence of lattice-based (i.e., periodic) microstructures limits the mechanical operation and the lifetime of materials. This research program proposes to investigate amorphous metal alloys by measuring their local mechanical properties to ultimately enable their aim-specific design. Conventional mechanical characterization techniques (e.g., compression, tension tests) only measure area/volume-averaged properties. As a result, it is not well-understood how deviations from the ideal lattice in disordered materials alter the local mechanical properties and thus, the governing physical and mechanical principles at the relevant length scales, i.e., nanometers. Furthermore, the lack of this basic knowledge hampers engineers and scientists in their efforts to establish the structure-property relationship of amorphous metals. To fill this fundamental gap, our research program will focus on the local mechanical characterization of disordered metal alloy compounds such as bulk metallic glasses, i.e., amorphous metals with no periodic crystal structure that is stronger than steel while being more resistant to wear and corrosion than regular metals. The intellectual merit of the proposed research program is that it will deliver the direct and accurate determination of the mechanical properties and deformation mechanisms of amorphous materials across different length scales as a function of the preparation history, sample size, alloy composition, and probing volume while enabling structure-property relationships facilitated by novel sample preparation (e.g., thermoplastic forming) and characterization techniques (e.g., scanning probe microscopy). The knowledge gained from this program is anticipated to have a critical impact on the targeted design and the microstructural understanding of damage mechanisms in amorphous metals, which will aid in novel industrial and defense applications in Canada. The ability to optimize the metal alloy compositions for specific needs of the steel and manufacturing industries is expected to contribute to high-technology applications while enhancing the competitiveness of Canadian companies. Beyond its scientific, technological, and industrial impact, one of the main thrusts of this program is the training of several highly qualified personnel (HQP) in an equal, diverse, inclusive, and intellectually stimulating environment. The trained HQP will be equipped with unique skills and hands-on experience in an area that combines multidisciplinary expertise to perform investigations of materials at the nanoscale and to implement new experimental approaches while meeting the academic and industrial demands in Canada.

材料的性质正在探索基础研究和工程应用。具体地，材料的机械性能（例如，强度、刚度和变形）对于人类文明的各个方面都很重要，包括能源、运输和通信。然而，基于网格的（即，周期性的）微结构限制了材料的机械操作和寿命。该研究计划建议通过测量非晶态金属合金的局部机械性能来研究它们，以最终实现其特定目标的设计。常规的机械表征技术（例如，压缩、拉伸测试）仅测量面积/体积平均性质。因此，尚不清楚无序材料中与理想晶格的偏离如何改变局部机械性质，从而改变相关长度尺度下的支配物理和机械原理，即，纳米。此外，缺乏这些基础知识阻碍了工程师和科学家建立非晶态金属结构-性能关系的努力。为了填补这一根本性的空白，我们的研究计划将集中在无序金属合金化合物，如大块金属玻璃，即局部机械特性，非晶态金属，没有周期性的晶体结构，比钢更坚固，同时比普通金属更耐磨损和腐蚀。拟议的研究计划的智力价值是，它将提供直接和准确的测定作为制备历史，样品大小，合金成分和探测体积的函数的不同长度尺度的非晶材料的机械性能和变形机制，同时通过新颖的样品制备促进结构-性能关系（例如，热塑性成形）和表征技术（例如，扫描探针显微镜）。从该计划中获得的知识预计将对目标设计和非晶态金属损伤机制的微观结构理解产生关键影响，这将有助于加拿大的新工业和国防应用。根据钢铁和制造业的具体需要优化金属合金成分的能力预计将有助于高技术应用，同时提高加拿大公司的竞争力。除了其科学，技术和工业影响，该计划的主要目标之一是在平等，多元化，包容和智力刺激的环境中培养几名高素质人才（HQP）。经过培训的HQP将配备独特的技能和实践经验，结合多学科专业知识，在纳米级进行材料调查，并实施新的实验方法，同时满足加拿大的学术和工业需求。