RUI: Morphology and Crystalline Orientation of Particles in Al65Cu20Fe15 Alloy Prepared by Arc Melting

RUI：电弧熔炼制备 Al65Cu20Fe15 合金中颗粒的形貌和晶体取向

• 批准号: 1900077
• 负责人: Chunfei Li
• 金额: $ 30.51万
• 依托单位: PENNSYLVANIA WESTERN UNIVERSITY
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-08-01 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1900077&HistoricalAwards=false
• 关键词: RUI; Morphology; Crystalline; Orientation; Particles

Non-Technical Summary:Crystalline and amorphous structures stand in two extremes in term of atomic configuration in solids. In a crystalline structure, atoms are arranged according to predefined rules while in amorphous structures atoms are packed in random fashion. Quasicrystalline structure can be considered as a state between the two. Materials of crystalline and amorphous structures, represented by gold and window glass, respectively, have been known to mankind for thousands of years. In contrast, materials of quasicrystalline structure were recently discovered in 1980's, and many aspects remain to be studied. An aluminum-copper-iron alloy of Al65Cu20Fe15 composition is one of the most studied alloys related to quasicrystalline phase. This alloy, when it is prepared by arc melting, is porous, consisting of multiple voids with particles of different morphologies on the surface. Despite previous extensive studies, there are many different opinions about the make-up and formation processes of these particles, probably because no previous studies have placed focus on them. Further, a primary study of these particles by the present principal investigator has revealed new details that deserve further investigation. This project will carry out a detailed study on these particles. In addition to scientific contribution, the project has significant impact on the education at Clarion University, a rural teaching college. First, it enables the principal investigator to stay active in research field and to integrate latest developments into teaching. Second, it gives students a rare opportunity to experience or observe authentic scientific research, strengthening their confidence in pursuing careers in science and technology. Annually, the project will reach students in the following ways: eight undergraduate students will work on the project either as paid research assistants or as volunteers; two local high school students will be given opportunity to work on the project for a week in summer; approximately 100 undergraduate students will be exposed to the project through introduction in course teaching; and interested students from one neighboring high school will be invited to campus to learn about the project from principal investigator and undergraduate students. Technical Summary:Six important problems related to the morphology and crystal orientation of particles on the surface of the voids of as-prepared Al65Cu20Fe15 alloy have been identified, which have either not been reported previously or have not been well understood. For example, there is strong evidence indicating that one type of particle consists of multiple phases, in contrast to previous single phase assumption. There are experimental results that lead to a speculation about the orientation relationship between quasicrystalline thin film and crystalline substrate, which needs to be confirmed and investigated further. These problems will be clarified experimentally by using a Scanning Electron Microscope (SEM) equipped with Energy Dispersive X-ray Spectroscopy (EDS) and Electron Backscattering Diffraction (EBSD), to be carried out at the principal investigator's home institute. The studies will be supplemented by theoretical analysis and Transmission Electron Microscope (TEM) examinations to be performed in collaboration with other institutes. Because of the clear and unique focus, this project will generate sufficient data to fill in the missing details and to clarify conflicting reports about the microstructure of this well-known alloy, thus establishing a reliable and consistent model about the phase formation process.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.

非技术总结：晶体和非晶体结构在固体中的原子构型方面处于两个极端。在晶体结构中，原子根据预定义的规则排列，而在非晶结构中，原子以随机方式堆积。准晶结构可以认为是介于两者之间的一种状态。以黄金和窗玻璃为代表的晶体和非晶体结构的材料已经为人类所知数千年了。准晶结构材料是80年代才发现的，还有许多方面有待研究。Al 65 Cu 20 Fe 15成分的铝-铜-铁合金是与准晶相相关的研究最多的合金之一。当通过电弧熔炼制备时，该合金是多孔的，由表面上具有不同形态的颗粒的多个空隙组成。尽管以前进行了广泛的研究，但关于这些颗粒的组成和形成过程有许多不同的观点，可能是因为以前没有研究关注它们。此外，本首席研究员对这些粒子的初步研究揭示了值得进一步研究的新细节。该项目将对这些粒子进行详细研究。除了科学贡献外，该项目还对农村教学学院Clarion University的教育产生了重大影响。首先，它使首席研究员能够在研究领域保持活跃，并将最新发展融入教学。其次，它给了学生一个难得的机会去体验或观察真实的科学研究，增强了他们追求科学和技术事业的信心。每年，该项目将通过以下方式接触学生：八名本科生将作为有偿研究助理或志愿者参与该项目;两名当地高中生将有机会在夏季参与该项目一周;大约100名本科生将通过课程教学介绍接触该项目;并邀请邻近一所高中感兴趣的学生到校园向首席研究员和本科生了解该项目。 技术总结：已经确定了与所制备的Al 65 Cu 20 Fe 15合金的空隙表面上的颗粒的形态和晶体取向相关的六个重要问题，这些问题以前没有报道或没有得到很好的理解。例如，有强有力的证据表明，一种类型的粒子由多个相组成，与以前的单相假设相反。实验结果对准晶薄膜与晶体衬底之间的取向关系提出了一些推测，但这些推测还有待于进一步的证实和研究。这些问题将通过使用配备有能量色散X射线光谱（EDS）和电子背散射衍射（EBSD）的扫描电子显微镜（SEM）在主要研究者的家庭研究所进行实验来澄清。这些研究将通过与其他研究所合作进行的理论分析和透射电子显微镜（TEM）检查来补充。由于明确和独特的重点，该项目将产生足够的数据来填补缺失的细节，并澄清关于这种众所周知的合金微观结构的相互矛盾的报告，从而建立一个可靠和一致的相形成过程模型。该奖项反映了NSF的法定使命，并被认为值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估来支持。

项目成果

Application of electron backscatter diffraction in facet crystalline orientation study of Al-Cu-Fe alloy

电子背散射衍射在Al-Cu-Fe合金晶面取向研究中的应用

• DOI: 10.1016/j.matchar.2022.112158
• 发表时间: 2022
• 期刊: Materials Characterization
• 影响因子: 4.7
• 作者: Li, Chunfei;Dubovi, Josiah;Klein, Clay
• 通讯作者: Klein, Clay

Computer Vision Applied to In-Situ Specimen Orientation Adjustment for Quantitative SEM Analysis

计算机视觉应用于定量 SEM 分析的原位样品方向调整

• DOI: 10.1093/micmic/ozac019
• 发表时间: 2022
• 期刊: Microscopy and Microanalysis
• 影响因子: 2.8
• 作者: Klein, Clay;Li, Chunfei
• 通讯作者: Li, Chunfei

Development and Validation of In-Situ Specimen Orientation Method for Quantitative SEM/EDS Analysis

用于定量 SEM/EDS 分析的原位样品定向方法的开发和验证

• DOI: 10.1017/s1431927622004214
• 发表时间: 2022
• 期刊: Microscopy and Microanalysis
• 影响因子: 2.8
• 作者: Klein, Clay;Corman, Faith;Homan, Joshua;Jones, Brady;Schroeder, Abbeigh;Duley, Heavenly;Li, Chunfei
• 通讯作者: Li, Chunfei

Application of Electron Back Scattering Diffraction in Facet Crystalline Orientation Analysis

电子背散射衍射在面晶取向分析中的应用

• DOI: 10.1017/s1431927622004159
• 发表时间: 2022
• 期刊: Microscopy and Microanalysis
• 影响因子: 2.8
• 作者: Dubovi, Josiah;Klein, Clay;Li, Chunfei
• 通讯作者: Li, Chunfei