Laser powder bed fusion (LPBF) provides fine spatial resolution for additively manufactured (AM) objects. Development of a new LPBF machine technology enables the incorporation of multi-directional compositional gradients. A sample with six compositional regions ranging from 100% titanium to 100% tantalum perpendicular to the build direction was produced, while also changing the processing parameters for the different material composition. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to observe both the bulk and interface regions. SEM images demonstrate that dendritic morphology is present as a result of the non-equilibrium solidification instead of the one-phase solid solution predicted from the equilibrium phase diagram. EDS line and area scans indicate diffusional segregation of tantalum away from the interface regions. The ability to functionally grade material composition in multiple directions using LPBF AM provides the capability to fabricate complex geometries with spatially varying properties tailored to the desired application.

激光粉末床融合 (LPBF) 可为增材制造 (AM) 物体提供精细的空间分辨率。新的 LPBF 机器技术的开发使多方向成分梯度的结合成为可能。生产了具有六个组成区域的样品，垂直于构建方向从 100% 钛到 100% 钽，同时还改变了不同材料组成的加工参数。使用扫描电子显微镜 (SEM) 和能量色散光谱 (EDS) 来观察体区和界面区。SEM 图像表明，由于非平衡凝固而不是根据平衡相图预测的单相固溶体，存在树枝状形态。EDS 线和面扫描表明钽远离界面区域的扩散偏析。使用 LPBF AM 在多个方向上对材料成分进行功能分级的能力提供了制造复杂几何形状的能力，这些几何形状具有根据所需应用定制的空间变化特性。