Collaborative Research: Nanoparticle-Enabled Mechanisms for Growth Control in Immiscible Alloys under Regular Cooling

合作研究：常规冷却下不混溶合金生长控制的纳米颗粒机制

• 批准号: 1562252
• 负责人: Xiaochun Li
• 金额: $ 17.15万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-07-01 至 2019-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1562252&HistoricalAwards=false
• 关键词: Collaborative; Research; Nanoparticle; Enabled; Mechanisms

Immiscible alloys - alloys composed of two elements which do not form compounds - are scientifically important and can offer unusual properties to enable a wide range of applications, such as bearings, superconductors, electrical contacts and switches, and giant magnetoresistive materials. However, it has been a long-standing (over 100 years) challenge to obtain the desired structures in these alloy to achieve the unique properties for applications envisioned. This award supports fundamental research to provide a transformative technology to obtain a uniform dispersion of fine minority phases in immiscible alloys during regular cooling. This work will enable the production of immiscible materials with exciting properties for practical applications. Course modules and teaching materials will be developed to provide undergraduate and graduate students with interdisciplinary training on nanotechnology and nano-metallurgy. The program will aim to attract, retain, and engage students from underrepresented groups. K-12 students and teachers will be exposed to the new technology through outreach activities. Partnerships with companies will facilitate technology transfer to real world. The objectives of this research are to establish fundamental knowledge bases to fully understand and effectively utilize nanoparticle-enabled mechanisms for controlling diffusional and colliding growth of the minority phase to obtain finely dispersed microstructure during regular cooling of immiscible alloys. Four highly interrelated tasks are planned to achieve the objectives. Task 1 is to conduct fundamental study to understand the principle of interfacial assembly of nanoparticles in immiscible alloys. Task 2 will conduct theoretical and experimental studies to understand the nanoparticle-enabled mechanisms of diffusional growth control and coagulation resistance. Task 3 is to characterize the micro/nano structures and properties of the resultant immiscible alloys with and without nanoparticles. Finally, Task 4 seeks to establish the processing/microstructure/ property relationships to guide potential industrial applications. This project will significantly advance the fundamental knowledge for controlling the growth of minority droplets in immiscible alloys to achieve finely dispersed microstructure in matrix even under regular cooling rates by rapid nanoparticle coating. Substantial fundamental insights on nanoparticle assembly in immiscible alloys, diffusion blocking/restriction mechanisms by nanoparticles, nanoparticle-enabled colliding growth control will be obtained. The processing/microstructure/property relationships will be understood and established to enable a rational design of advanced immiscible materials with desired properties for wide applications.

不混溶的合金 - 由两种不形成化合物的元素组成的合金 - 在科学上很重要，可以提供异常的特性，以实现广泛的应用，例如轴承，超导体，电气接触和开关以及巨型磁磁性材料。但是，获得这些合金中所需的结构以实现所设想的应用程序的独特属性，这是一个长期的（超过100年）的挑战。该奖项支持基础研究，以提供一种变革性的技术，以在常规冷却期间获得不可分化的合金中良好的少数族裔阶段的统一分散。这项工作将使不混溶的材料生产具有令人兴奋的实际应用特性。将开发课程模块和教学材料，以向本科生和研究生提供有关纳米技术和纳米 - 金属毛的跨学科培训。该计划的目的是吸引，保留和吸引代表性不足的团体的学生。 K-12学生和老师将通过外展活动接触新技术。与公司的伙伴关系将促进技术转移到现实世界。 这项研究的目的是建立基本知识库，以充分理解并有效利用富含纳米颗粒的机制来控制少数阶段的扩散和碰撞增长，以在常规合金的常规冷却过程中获得细化的微观结构。计划实现四个高度相互关联的任务以实现目标。任务1是进行基本研究，以了解不可分化的合金中纳米颗粒的界面组装原理。任务2将进行理论和实验研究，以了解扩散生长控制和凝结耐药性的纳米颗粒机制。任务3是表征带有和没有纳米颗粒的产生不混溶合金的微/纳米结构和性能。最后，任务4试图建立处理/微观结构/属性关系，以指导潜在的工业应用。该项目将显着促进基本知识，以控制不可分化的合金中少数液滴的生长，即使在常规的纳米粒子涂层下，即使在常规冷却速率下，也可以在基质中实现精细分散的微结构。对不混溶的合金中的纳米颗粒组件，纳米颗粒的扩散阻断/限制机制，将获得具有纳米颗粒的碰撞生长控制的基本见解。将了解并建立处理/微观结构/属性关系，以实现具有所需属性的高级不混溶材料的合理设计。