Collaborative Research: Composite Surfacing of Amorphous Materials by Laser Interference Nanopatterning

这项合作研究资助的目标是开发一种新型的基于激光的表面工程技术，以提高非晶体材料（主要是金属）的延展性。将采用激光干涉图案化来产生在这些材料的表面上具有残余应力的局部超细晶粒结构的周期线或点的改性区域。该研究的主要目标是（i）确定与干涉图案化过程中调制的激光强度的相互作用相关的热物理效应，以及（ii）表征调制的微观结构，结晶动力学和激光图案化过程中的残余应力分布。这些目标将有助于建立的作用，表面改性提高全球可塑性的非晶材料。最后，一个计算模型的基础上的热物理相互作用与激光干涉图案化的非晶材料表面的剪裁的effects. Successfully完成这个项目的激光干涉图案将显着推进国家的最先进的塑性化的固有脆性非晶合金，导致更广泛地接受这些材料的先进结构应用。该研究将阐明非晶材料塑性增强的基本机制，通过设计由原始非晶区域和具有残余应力的超细晶粒结构区域组成的周期性表面结构。 通过协同计算和实验的方法，该研究有望建立下一代结构材料系统的设计和合成方法。此外，该合作项目将为学生提供研究新颖和先进的加工方法和材料的机会，并将帮助培养下一代全球科学家/工程师的多样化和有能力的劳动力。

The goal of this collaborative research grant is the development of a novel laser-based surface engineering technique to enhance the ductility of non-crystalline materials, primarily metals. Laser interference patterning will be employed to produce modified regions of periodic lines or dots of localized ultrafine grain structure with residual stresses on the surface of these materials. The major objectives of the research are (i) to identify the thermo-physical effects associated with the interaction of modulated laser intensity during interference patterning and (ii) to characterize the modulated microstructure, crystallization dynamics, and distribution of residual stresses during laser patterning. These objectives will be instrumental in establishing the role of surface modification on enhancing global plasticity of the non-crystalline materials. Finally, a computational model based on the thermo-physical interactions associated with laser interference patterning of non-crystalline material surfaces for tailoring the effects will be developed.Successful completion of this project on laser interference patterning will significantly advance the state-of-the-art in ductilization of inherently brittle non-crystalline alloys leading to wider acceptance of these materials for advanced structural applications. The research will elucidate the fundamental mechanisms of plasticity enhancement of non-crystalline materials through design of periodic surface structures consisting of original non-crystalline regions and regions of ultrafine grain structure with residual stresses. Through synergistic computational and experimental approach, the research is expected to establish a methodology for design and synthesis of next generation structural materials system. Furthermore, the collaborative project will provide opportunities for students to work on novel and advanced processing methods and materials and will help prepare diverse and capable workforce of next generation global scientists/engineers.