Structural and Microstructural Studies of Ti/Zr- and Al-Based Quasicrystal, Approximants and Metallic Glasses

Ti/Zr 和 Al 基准晶、近似晶和金属玻璃的结构和微观结构研究

• 批准号: 0072787
• 负责人: Kenneth Kelton
• 金额: $ 7.89万
• 依托单位: Washington University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-08-01 至 2004-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0072787&HistoricalAwards=false
• 关键词: Structural; Microstructural; Studies; Ti; Zr

0072787 Kelton This research explores the formation and structure of titanium-zirconium based quasicrystals. There are several facets to the program: (1) elastic neutron scattering and NMR studies of quasicrystals that are partially loaded with hydrogen and deuterium; (2) examination of the Ti-Zr-Ni phase diagram; (3) the transformation mechanisms of transition phases; and (4) the nucleation and growth characteristics of the crystal metal hydride phases that form during hydrogen cycling. An attempt is made to model and measure quantitatively the time-dependent nucleation rates in selected Ti-Zr glasses that crystallize to nanostructured quasicrystals and crystals. In addition H and D are used as structural probes for stable AlPdMn and MgZn-rare earth quasicrystals to test proposed structural models.%%%The results of these studies are of value to the quasicrystal scientific community and the broader materials community. Insight gained from the crystallization studies leads to refinements of new models for nucleation and improved processing capabilities for the production of nanostructured materials.***

0072787凯尔顿本研究探索了钛-锆基准晶的形成和结构。 该计划有几个方面：（1）部分负载氢和氘的准晶的弹性中子散射和NMR研究;（2）Ti-Zr-Ni相图的检查;（3）过渡相的转变机制;以及（4）氢循环过程中形成的晶体金属氢化物相的成核和生长特性。 试图在选定的Ti-Zr玻璃，结晶纳米结构的准晶和晶体的时间依赖性的成核速率进行建模和定量测量。此外，H和D被用作稳定的AlPdMn和MgZn-稀土准晶的结构探针，以测试所提出的结构模型。这些研究结果对准晶体科学界和更广泛的材料界都有价值。 从结晶研究中获得的见解导致了新的成核模型的改进和纳米结构材料生产的加工能力的提高。*