SGER: Investigation of a Combinatorial Mechanical Alloying-Activated Sintering (MA-AS) Technique for the Synthesis of Age-Hardenable, Self-lubricating Bearings by Powder Metallurgy

SGER：研究通过粉末冶金合成时效硬化自润滑轴承的组合机械合金化激活烧结 (MA-AS) 技术

• 批准号: 0217267
• 负责人: Deepak Bhat
• 金额: $ 5万
• 依托单位: University of Arkansas
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-07-15 至 2004-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0217267&HistoricalAwards=false
• 关键词: SGER; Investigation; Combinatorial; Mechanical; Alloying

This SGER award supports an investigation of combinatorial materials processing techniques for the synthesis of age-hardenable aluminum alloys by powder metallurgy, which can also be simultaneously strengthened by a dispersion of a finely divided oxide phase. It is well known that the sintering of aluminum powder is hampered by the presence of a tenacious oxide film on the surface, which interferes with pressing and sintering of the powder compacts. Beneficial effects of a dispersion of refractory oxide particles in an alloy matrix for enhanced hardness and strength are well known; however, the technical difficulties are not easily overcome without the use of complex methods. Mechanical alloying techniques have been known to provide a significant benefit for inducing solid-state diffusion and alloying of materials. Sintering processes, enhanced by methods of plasma activation and similar techniques, have been used in combination with mechanical alloying to synthesize refractory metals, intermetallics, metallic glasses and other difficult materials.This proposal deals with the study of a novel combination of mechanical alloying and chemically activated sintering of Al-Cu age-hardenable alloys. In this work, powders of aluminum will be mechanically alloyed with nanocrystalline powders of copper of platelet or flake morphology, and subjected to chemical activation by exposure to selected dilute organic acids, to provide suitable metal-organic surface films on the treated powders. The decomposition of these films at low temperatures will provide a highly activated surface for rapid sintering and densification of the alloyed powders. The sintered compacts will be heat treated to provide the age-hardening effect. At the same time, the dispersion of the aluminum oxide particles during mechanical alloying will provide the possibility of dispersion-strengthening of the sintered alloy.This project will provide unique and excellent opportunities to enterprising young engineering students to pursue cutting edge research in advanced materials and manufacturing techniques, and to learn about the potential benefits of nanostructured and engineered materials. The establishment of this research program will provide a unique opportunity for the PI to develop new and exciting classroom and laboratory instructional materials and courses to augment the research effort. The PI is participating in the George Washington Carver Project administered by the University of Arkansas, which provides promising and talented young undergraduate students from the historically black colleges and universities (HBCU) in the State of Arkansas an opportunity to experience the excitement and benefits of a science or engineering career. Under this program, selected youngsters will spend several weeks on campus, working with a faculty member and assisting in an on-going or specially developed research project. The PI will be supporting one undergraduate student under the Carver Project during the upcoming summer session. The student will work on this SGER project, assisting a graduate student in Mechanical Engineering, to set up and use the laboratory P/M processing equipment and conduct laboratory experiments. The student will learn research methods, laboratory procedures and safety issues, research documentation and analysis of experimental data, and acquire hands-on experience in the application of scientific and engineering principles in the development of advanced materials and manufacturing techniques.

该 SGER 奖项支持对通过粉末冶金合成可时效硬化铝合金的组合材料加工技术的研究，该技术还可以通过细碎氧化物相的分散来同时强化。 众所周知，铝粉的烧结因表面存在的坚韧氧化膜而受到阻碍，这会干扰粉末压块的压制和烧结。 将耐火氧化物颗粒分散在合金基体中对于提高硬度和强度的有益效果是众所周知的。然而，如果不使用复杂的方法，技术困难是不容易克服的。 众所周知，机械合金化技术对于诱导材料的固态扩散和合金化具有显着的益处。 通过等离子体活化方法和类似技术增强的烧结工艺已与机械合金化相结合，用于合成难熔金属、金属间化合物、金属玻璃和其他难加工材料。本提案涉及机械合金化和化学合金化的新型组合的研究Al-Cu 时效硬化合金的活化烧结。 在这项工作中，铝粉将与片状或片状形态的铜纳米晶粉末机械合金化，并通过暴露于选定的稀有机酸进行化学活化，以在处理过的粉末上提供合适的金属有机表面膜。 这些薄膜在低温下的分解将为合金粉末的快速烧结和致密化提供高度活化的表面。 烧结体将经过热处理以提供时效硬化效果。 同时，机械合金化过程中氧化铝颗粒的分散将为烧结合金的分散强化提供可能性。该项目将为有进取心的年轻工科学生提供独特而绝佳的机会，以追求先进材料和材料领域的前沿研究。制造技术，并了解纳米结构和工程材料的潜在优势。 该研究计划的建立将为 PI 提供一个独特的机会来开发新的、令人兴奋的课堂和实验室教学材料和课程，以加强研究工作。 PI 正在参与由阿肯色大学管理的乔治·华盛顿·卡弗项目，该项目为来自阿肯色州历史悠久的黑人学院和大学 (HBCU) 的有前途且有才华的年轻本科生提供了体验黑人大学的兴奋和好处的机会。科学或工程职业。 根据该计划，选定的年轻人将在校园度过几周的时间，与教职人员一起工作并协助正在进行或专门开发的研究项目。 PI 将在即将到来的夏季课程期间为卡弗项目下的一名本科生提供支持。 该学生将参与该 SGER 项目，协助机械工程研究生建立和使用实验室 P/M 加工设备并进行实验室实验。 学生将学习研究方法、实验室程序和安全问题、研究文档和实验数据分析，并获得在先进材料和制造技术开发中应用科学和工程原理的实践经验。