High-Temperature Microstructural Fences

高温微结构围栏

• 批准号: 9315755
• 负责人: Gerhard Welsch
• 金额: $ 37.68万
• 依托单位: Case Western Reserve University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-02-15 至 1997-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9315755&HistoricalAwards=false
• 关键词: Temperature; Microstructural; Fences

9315755 Welsch Arrays of pinning centers (microstructural fences) are introduced to pin grain boundaries by introducing dopant below the surface by ion implantation. Bulk materials are created by laminating the implanted layered material according to desired patterns for achieving high strength materials. The research involves ion implantation, structural characterization by transmission electron microscopy, and mechanical testing. Several parameters are explored related to the fences that are created in the layers. These include implantation concentration, species, temperature, and post annealing treatment. Studies include bubble pinning point determination, bubble and grain growth kinetics, and grain size (related to Hall-Petch strengthening). %%% A benefit of this research could be creep-resistant metal alloys for high temperature use. Improved low-temperature fracture toughness could also be a product from the research. ***

小行星9315755 通过离子注入在表面下引入掺杂剂，引入钉扎中心阵列（微观结构栅栏）以钉扎晶界。 通过根据所需图案层压注入的层状材料来产生块状材料，以获得高强度材料。 研究涉及离子注入、透射电子显微镜结构表征和机械测试。 探索与在层中创建的围栏相关的几个参数。 这些包括注入浓度、种类、温度和后退火处理。 研究包括气泡钉扎点测定，气泡和晶粒生长动力学，晶粒尺寸（与Hall-Petch强化）。 这项研究的一个好处可能是高温使用的抗蠕变金属合金。 改进的低温断裂韧性也可能是该研究的产物。 ***