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奖支持对组合材料加工技术的研究，用于通过粉末冶金粉合成年龄可硬化的铝合金，这也可以通过分散细分氧化物相的分散来同时加强。 众所周知，铝粉的烧结受到表面上顽强的氧化物膜的存在来阻碍，这会干扰粉末紧凑的压力和烧结。 众所周知，合金基质中难治性氧化物颗粒的分散剂的有益作用是众所周知的。但是，如果没有使用复杂的方法，就不容易克服技术困难。 众所周知，机械合金技术为诱导固态扩散和材料合金的合金提供了重要优势。 通过血浆激活和类似技术增强的烧结过程已与机械合金结合使用，以合成耐火材料，金属间的金属玻璃，金属玻璃和其他困难材料。该提案与机械合金和化学合金和化学合金组合的研究交易激活的Al-Cu年龄可塑色合金的烧结。 在这项工作中，铝的粉末将与血小板或薄片形态的铜粉末机械合金，并通过暴露于选定的稀稀释酸中的化学激活，以在处理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提供高度激活的表面，以快速烧结和合金粉末致密。 烧结的契约将进行热处理以提供年龄的效果。 同时，机械合金过程中氧化铝颗粒的分散将提供烧结合金加强分散的可能性。该项目将为进取的年轻工程学生提供独特而出色的机会，以从事高级材料和高级材料的剪切研究和制造技术，并了解纳米结构和工程材料的潜在好处。 该研究计划的建立将为PI提供一个独特的机会，以开发新的令人兴奋的课堂和实验室教学材料和课程，以增加研究工作。 PI参加了由阿肯色大学管理的乔治华盛顿Carver项目，该项目提供了来自阿肯色州历史悠久的黑人学院和大学（HBCU）的有前途且才华横溢的年轻本科生（HBCU）科学或工程职业。 根据该计划，选定的年轻人将在校园里度过几个星期，与一名教职员工合作，并协助开发或专门开发的研究项目。 PI将在即将举行的夏季会议期间在Carver项目下支持一名本科生。 该学生将研究这个SGER项目，协助一名机械工程研究生，以设置和使用实验室P/M处理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，实验数据的研究文档和分析，并在高级材料和制造技术的开发中获得科学和工程原理的实践经验。