Investigation of ultrashort pulse laser material processing of low- and high-entropy alloys using an ultrafast temperature and density sensor

使用超快温度和密度传感器研究低熵和高熵合金的超短脉冲激光材料加工

• 批准号: 528706678
• 负责人: Professor Dr. Heinz Paul Huber
• 金额: --
• 依托单位: Laserzentrum Hochschule München (LHM)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/528706678?language=en
• 关键词: Investigation; ultrashort; pulse; laser; material

Laser materials processing is currently the most common application for modern laser systems, followed by telecommunications, medicine, and basic research. Especially the freely designable processing of materials with a variety of manufacturing processes has made the laser an indispensable flexible tool. Because of its high precision and broad range of applications, ultrashort pulse laser material processing of metals and their alloys has enormous potential for Industry 4.0. The optimization of process parameters in terms of quality, energy and resource efficiency is crucial. However, due to widely varying material properties and laser system parameters, no universal process window has been developed so far. Particularly for novel alloys such as high-entropy alloys, which are becoming progressively important due to rising technical demands. The project's goal is to investigate a quantitative, experimentally validated model of ultrashort pulse laser material processing of various iron and nickel-containing alloys of 3d transition metals, ranging from conventional stainless steels to modern high-entropy alloys. As a result, a thorough understanding of the process dynamics will be developed through the use of an experimentally validated model. This can solely be accomplished through the close interplay of theory and experiments. Utilizing ultrafast time-resolved ellipsometric and interferometric pump-probe experiments, as well as theoretical ab-initio modeling, will allow quantitative conclusions on the transient change of thermodynamic state variables to be drawn. The experimentally validated model should be able to predict both time-dependent observables like transient reflection, absorption, and surface bulging as well as final state observables like ablation thresholds and efficiencies. The developed methodology, referred to as an "ultrafast temperature and density sensor” and the resulting findings are expected to contribute significantly to the overall quantitative understanding of ultrashort pulse laser material processing of modern alloys. Furthermore, novel insights into the material parameters of these alloys in exotic states, which have previously been unexplored, are expected.

激光材料加工是目前现代激光系统最常见的应用，其次是电信、医学和基础研究。特别是可自由设计的材料加工和各种制造工艺，使激光成为不可或缺的灵活工具。由于其高精度和广泛的应用范围，超短脉冲激光加工金属及其合金材料具有巨大的工业4.0潜力。在质量、能源和资源效率方面优化工艺参数至关重要。然而，由于材料性质和激光系统参数的差异很大，到目前为止还没有开发出通用的工艺窗口。特别是对于新型合金，如高熵合金，由于技术要求的提高，这些合金正变得越来越重要。该项目的目标是研究一种定量的、经过实验验证的超短脉冲激光材料加工模型，该模型可以加工从传统不锈钢到现代高熵合金的各种含铁和含镍的3D过渡金属合金。因此，通过使用实验验证的模型，将对过程动力学有一个彻底的理解。这完全可以通过理论和实验的密切相互作用来实现。利用超快时间分辨椭圆偏振实验和干涉泵浦-探测实验，以及理论从头算模拟，可以得出热力学状态变量的瞬时变化的定量结论。经过实验验证的模型应该能够预测瞬变反射、吸收和表面鼓起等随时间变化的可观测性，以及烧蚀阈值和效率等最终状态可观测性。这种被称为“超快温度和密度传感器”的方法及其结果有望对现代合金的超短脉冲激光材料加工的整体定量理解做出重大贡献。此外，人们还有望对这些合金在奇异状态下的材料参数有新的见解，这是以前从未探索过的。