Powder-Based Dealloying

粉末脱合金

• 批准号: 1806142
• 负责人: Jonah Erlebacher
• 金额: $ 49.1万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-06-01 至 2021-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1806142&HistoricalAwards=false
• 关键词: Powder; Based; Dealloying

Non-Technical SummaryThe discovery and design of new metals involves controlling material composition and structure at the microscale. By such control, better materials can be made for many different applications, from structural materials to catalysts to batteries, and to materials with high tolerance to radiation damage. This program is examining a new approach to making these next-generation metals and metallic nanostructures, mixing inspiration from powder metallurgy and from an exotic materials processing technique called dealloying. Dealloying occurs when one element of a solid metal is pulled out of the metal, leaving behind a nanoporous material. The central hypothesis of this work, is that a powder mixture can be used to create dealloyed materials. One powder component acts to absorb elements dealloyed from the other. Because powders are being used, it is expected that bulk amounts of processed materials can be made easily and readily tested for different applications. Student training at the undergraduate and graduate levels will help develop the next generation of materials scientists trained in modern metallurgy. Such training will be complemented by organizing and participating in international conferences on dealloying and related professional development.Technical SummaryNanocomposite and nanoporous metals consisting of multiple interpenetrating but compositionally distinct solid and void phases hold promise for structural applications requiring high strength, high ductility, radiation tolerance, catalysis, sensing, supercapacitors, batteries, and as templates to make new nanocomposites via backfilling. A technique to make such materials is dealloying - the selective dissolution of one component from a multi-component alloy. This project explores the next-generation of dealloyed nanostructured materials, using a concept called powder-based dealloying. Powder-based dealloying refers to the metallurgical phase evolution in the environment of mixed powders, where the composition of one powder is the material to be dealloyed, and the other powder, when melted, acts as the dealloying medium. This involves analysis of the kinetics of dealloying in fixed volumes, and it is hypothesized that bulk samples of metals can be made that exhibit very fine microstructures with characteristic lengths less than 50 nm. We are also taking the first steps to assess how dealloying can be integrated into powder metallurgical processing methods, and perhaps ultimately additive manufacturing. By examining a range of model materials made by powder-based dealloying, a database of basic physical kinetics behavior will be developed that will be applicable to many high-temperature processing technologies, from sintering to additive manufacturing, as well as more efficiently work with rare, hard-to-sustain, and refractory materials. Student training at the undergraduate and graduate levels will help develop the next generation of materials scientists trained in modern metallurgy. Such training will be complemented by organizing and participating in international conferences on dealloying and related professional development.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

新金属的发现和设计涉及到在微观尺度上控制材料成分和结构。通过这种控制，可以为许多不同的应用制造更好的材料，从结构材料到催化剂到电池，以及对辐射损伤具有高耐受性的材料。这个项目正在研究一种制造下一代金属和金属纳米结构的新方法，混合了粉末冶金和一种叫做脱合金的特殊材料加工技术的灵感。当固体金属中的一种元素从金属中抽出，留下纳米多孔材料时，就会发生脱合金。这项工作的中心假设是，粉末混合物可以用来制造合金材料。一种粉末成分的作用是从另一种粉末中吸收合金元素。由于正在使用粉末，预计可以很容易地制造大量加工过的材料，并随时对不同的应用进行测试。在本科和研究生阶段的学生培训将有助于培养下一代受过现代冶金训练的材料科学家。这种培训将以组织和参加关于冶炼和有关专业发展的国际会议作为补充。纳米复合材料和纳米多孔金属由多个互穿但组成不同的固体和空隙相组成，在高强度、高延展性、耐辐射、催化、传感、超级电容器、电池等结构应用中具有广阔的前景，并可作为通过回填制造新型纳米复合材料的模板。制造这种材料的一种技术是脱合金，即从多组分合金中选择性地溶解一种成分。这个项目探索了下一代合金纳米结构材料，使用了一种叫做粉末基合金的概念。粉末基脱合金是指在混合粉末环境下的冶金相演变，其中一种粉末的成分是待脱合金的材料，另一种粉末在熔化时作为脱合金介质。这包括在固定体积中分析脱合金的动力学，并且假设可以制造出具有特征长度小于50纳米的非常精细的微观结构的大量金属样品。我们也在迈出第一步，评估如何将脱合金整合到粉末冶金加工方法中，最终可能是增材制造。通过检查一系列粉末基合金模型材料，将开发一个基本物理动力学行为数据库，该数据库将适用于许多高温加工技术，从烧结到增材制造，以及更有效地处理稀有，难以维持和耐火材料。在本科和研究生阶段的学生培训将有助于培养下一代受过现代冶金训练的材料科学家。这种培训将以组织和参加关于冶炼和有关专业发展的国际会议作为补充。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Carbon transformations in rapidly solidified nickel–carbon ribbon

• DOI: 10.1016/j.carbon.2021.08.037
• 发表时间: 2021-08
• 期刊: Carbon
• 影响因子: 10.9
• 作者: G. Greenidge;S. Price;J. Erlebacher

Porous graphite fabricated by liquid metal dealloying of silicon carbide

• DOI: 10.1016/j.carbon.2020.04.028
• 发表时间: 2020-09-15
• 期刊: CARBON
• 影响因子: 10.9
• 作者: Greenidge, G.;Erlebacher, J.
• 通讯作者: Erlebacher, J.

Vapor phase dealloying kinetics of MnZn alloys

• DOI: 10.1016/j.actamat.2021.116916
• 发表时间: 2021-05-08
• 期刊: ACTA MATERIALIA
• 影响因子: 9.4
• 作者: Lu, Zhen;Zhang, Fan;Chen, Mingwei
• 通讯作者: Chen, Mingwei

Electrochemical Dealloying with Simultaneous Phase Separation

• DOI: 10.1016/j.actamat.2019.03.039
• 发表时间: 2018-11
• 期刊: Materials Performance eJournal
• 作者: Yuqiao Zeng;B. Gaskey;Ellen Benn;I. McCue;G. Greenidge;K. Livi;Xuhai Zhang;Jianqing Jiang;Jonah Elebacher