Phase-Reversion Induced Nanometer-Sized Grains in Materials

该奖项的研究目标是研究加工概念，以制造具有纳米尺寸晶粒的工程材料，其特征是非常高的强度与延展性相结合。加工概念的发展将通过阐明纳米材料中塑性变形和高延展性的基本原理来解决纳米结构材料中低延展性的关键问题。将根据加工方案和机械性能之间的相互关系，开发具有预测能力的各种材料系统的物理模型。 这项研究的成功完成将提供先进的高强度铁基合金的机械加工与上级成形性。纳米颗粒材料的高强度-延展性组合将允许更薄的截面或部件，这可能导致运输部门的燃料经济性。通常添加稀有和昂贵的合金元素以实现高强度和延展性的期望效果。在这方面，研究的结果可能会减少对这些合金元素的依赖，通过热机械加工方法获得纳米晶粒结构。此外，纳米颗粒/超细颗粒结构被认为有利于骨科植入物表面上的细胞粘附和代谢活性。研究生和本科工程专业的学生将通过参与研究和研究与现有课程的整合受益。

The research objective of the award is to investigate processing concepts to fabricate engineering materials with nanometer-sized grains that are characterized by a combination of very high strength in conjunction with ductility. The development of processing concepts will address the critical issue of low ductility in nanostructured materials by elucidating the underlying basic principles governing plastic deformation and high ductility in nanograined materials. Physical models with predictive capabilities for a wide range of material systems based on the inter-relationships between the processing scheme and mechanical properties will be developed. Successful completion of this research will provide mechanical processing of advanced high strength iron-based alloys with superior formability. The high strength-ductility combination of nanograined materials will allow for thinner sections or components which may lead to fuel economy in the transportation sector. Often scarce and expensive alloying elements are added to achieve the desired effects of high strength and ductility. In this regard, the outcome of the research may reduce the dependence on these alloying elements through thermo-mechanical processing approaches to obtain nanograined structures. Additionally, nanograined/ultrafine-grained structures are believed to be favorable for cell adhesion and metabolic activity on the surface of orthopedic implants. Graduate and undergraduate engineering students will benefit through involvement in research and integration of research with existing curriculum.