Friction and plasticity of amorphous metal coatings

非晶金属涂层的摩擦和塑性

• 批准号: 1161978
• 负责人: Xinghang Zhang
• 金额: $ 28.36万
• 依托单位: Texas A&M Engineering Experiment Station
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-15 至 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1161978&HistoricalAwards=false
• 关键词: Friction; plasticity; amorphous; metal; coatings

The research objective of this grant is to elucidate the fundamental mechanisms of friction and plasticity in amorphous metal coatings. Certain MEMS/NEMS devices operated in dynamic mode have long been haunted by tribological issues. The scale-down of devices leads to large increases in surface force, including friction. In miniaturized gears manufactured by electrodeposited nanocrystalline metal, wear becomes an important issue. Environmental issues associated with electrodeposition of hard Cr coatings also call for commensurate replacement that can be fabricated by environment benign process. High-strength, amorphous metal coating is an appealing candidate for these purposes as it has high hardness, low surface roughness, and compatible elastic modulus and thermal expansion coefficient in comparison to metal substrates. However its friction behavior is poorly understood. Plasticity in amorphous coatings is an equally important subject, as it directly impacts tribological properties of these coatings. Several hypotheses will be tested, including amorphous metal coatings may have much lower friction coefficient than their crystalline counterparts, layer interface may induce unique friction and wear properties in amorphous multilayers. To examine these hypotheses, the PI will combine nanofabrication of amorphous films with advanced friction and nanomechanical testing techniques.If successful, the project may significantly improve the reliability and functionality of NEMS/MEMS components, magnetic data storage devices and wear resistant coatings. The concept and knowledge derived from this project will be of great scientific interest to metallic glass, coatings, nanomechanics, NEMS/MEMS, and the tribology community. Additionally this project will offer research training to graduate and undergraduate students at Texas A & M University (TAMU). Special effort will be made to recruit female and other minority students through the "Pathway to Ph.D program" funded by TAMU. The project will also enhance the materials science and nanoengineering curricula by incorporating the relevant results into classes when introducing advanced nanomaterials and benefit the relatively new Materials Science and Engineering graduate program. The PI will disseminate results to a much broader audience by involving high school teachers in the research project through NSF-RET program and through participation in international conferences. Collaborations with national laboratories will offer graduate students summer research experiences.

该资助的研究目的是阐明非晶金属涂层摩擦和塑性的基本机制。 某些在动态模式下运行的 MEMS/NEMS 设备长期以来一直受到摩擦学问题的困扰。 设备的缩小导致表面力（包括摩擦力）大幅增加。 在由电沉积纳米晶金属制造的小型齿轮中，磨损成为一个重要问题。 与电沉积硬铬涂层相关的环境问题也需要相应的替代品，这种替代品可以通过环境友好的工艺来制造。 高强度、非晶态金属涂层是用于这些目的的有吸引力的候选者，因为与金属基材相比，它具有高硬度、低表面粗糙度以及相容的弹性模量和热膨胀系数。 然而，人们对它的摩擦行为知之甚少。 无定形涂层中的塑性是一个同样重要的主题，因为它直接影响这些涂层的摩擦学性能。 将测试几种假设，包括非晶态金属涂层的摩擦系数可能比晶态金属涂层低得多，层界面可能会在非晶态多层中产生独特的摩擦和磨损特性。 为了检验这些假设，PI 将把非晶薄膜的纳米制造与先进的摩擦和纳米力学测试技术结合起来。如果成功，该项目可能会显着提高 NEMS/MEMS 组件、磁性数据存储设备和耐磨涂层的可靠性和功能性。 该项目得出的概念和知识将对金属玻璃、涂层、纳米力学、NEMS/MEMS 和摩擦学界产生巨大的科学意义。 此外，该项目还将为德克萨斯农工大学 (TAMU) 的研究生和本科生提供研究培训。 TAMU 资助的“博士之路项目”将特别努力招收女性和其他少数民族学生。 该项目还将在介绍先进纳米材料时将相关成果纳入课堂，从而加强材料科学和纳米工程课程，并使相对较新的材料科学与工程研究生课程受益。 PI 将通过 NSF-RET 计划让高中教师参与研究项目以及参加国际会议，从而向更广泛的受众传播研究结果。 与国家实验室的合作将为研究生提供暑期研究经验。