NASA Glenn Research Center, Cleveland, OH, USA.
NASA Ames Research Center, Moffett Field, CA, USA.
Nature. 2023 May;617(7961):513-518. doi: 10.1038/s41586-023-05893-0. Epub 2023 Apr 19.
Multiprincipal-element alloys are an enabling class of materials owing to their impressive mechanical and oxidation-resistant properties, especially in extreme environments. Here we develop a new oxide-dispersion-strengthened NiCoCr-based alloy using a model-driven alloy design approach and laser-based additive manufacturing. This oxide-dispersion-strengthened alloy, called GRX-810, uses laser powder bed fusion to disperse nanoscale YO particles throughout the microstructure without the use of resource-intensive processing steps such as mechanical or in situ alloying. We show the successful incorporation and dispersion of nanoscale oxides throughout the GRX-810 build volume via high-resolution characterization of its microstructure. The mechanical results of GRX-810 show a twofold improvement in strength, over 1,000-fold better creep performance and twofold improvement in oxidation resistance compared with the traditional polycrystalline wrought Ni-based alloys used extensively in additive manufacturing at 1,093 °C. The success of this alloy highlights how model-driven alloy designs can provide superior compositions using far fewer resources compared with the 'trial-and-error' methods of the past. These results showcase how future alloy development that leverages dispersion strengthening combined with additive manufacturing processing can accelerate the discovery of revolutionary materials.
多主元合金是一类具有强大功能的材料,因为它们具有令人印象深刻的机械和抗氧化性能,特别是在极端环境中。在这里,我们使用模型驱动的合金设计方法和基于激光的增材制造技术,开发了一种新型的氧化弥散强化 NiCoCr 基合金。这种氧化弥散强化合金称为 GRX-810,使用激光粉末床熔合技术在整个微观结构中弥散纳米级 YO 颗粒,而无需使用资源密集型的加工步骤,如机械或原位合金化。我们通过对其微观结构的高分辨率表征,展示了纳米级氧化物在 GRX-810 构建体积中的成功掺入和弥散。与广泛用于增材制造的传统多晶变形镍基合金相比,GRX-810 的机械性能显示出强度提高了两倍,蠕变性能提高了 1000 倍以上,抗氧化性提高了两倍。该合金的成功突出表明,与过去的“反复试验”方法相比,模型驱动的合金设计可以使用更少的资源提供更优越的成分。这些结果展示了如何利用弥散强化结合增材制造加工来加速发现革命性材料的未来合金开发。