Designing toughening concepts for future hard coatings

虽然硬质涂层具有衬底保护强度和硬度，但这些涂层的延展性有限。我们将设计采用相变来增加涂层韧性的硬质涂层。由于这些涂层的厚度在微米量级，因此需要在这个长度尺度上进行实验，以了解断裂增韧机制。我们将使用微断裂实验和原位技术来量化相变的范围。模拟将考虑衬底和涂层结构，将计算每个几何形状的裂纹驱动力，并将指导设计的每一次迭代。

Although hard coatings have a substrate protecting strength and stiffness, these coatings have limited ductility. We will design hard coatings that employ phase-transformations to increase the coating toughness. Because these coatings have a thickness on the order of micrometer, experiments for this length-scale are required to understand the fracture toughening mechanisms. We will employ micro-fracture experiments with in-situ techniques to quantify the domain of phase-transformation. Simulations will account for the substrate and the coating structure, will calculate the crack driving force for each geometry as well as will guide every iteration of the design.