Directed energy deposition (DED) is an additive manufacturing technique that employs laser melting to permit for the free form manufacturing of components from many input materials from powder or wire form of feedstock. The nature of DED processes and advancements thereof has led to research that has been aimed at leveraging this additive manufacturing technology for the fabrication of high-value metallic alloys in addition to the exploration of multi-material composites and components – many of which are only possible to produce via DED. Herein, a critical review of the present body of research regarding DED of multi-materials is presented. Assessed are the developing research trends, design methodologies, common issues and challenges, as well as identification of the areas where further research should be directed.

定向能量沉积（DED）是一种增材制造技术，该技术采用激光熔化技术，可以从粉末或金属丝原料的许多输入材料中自由制造零件。DED工艺的性质及其进步已经导致了旨在利用这种增材制造技术制造高价值金属合金的研究，此外还探索了多种材料的复合材料和部件-其中许多是唯一可能的通过DED生产。本文中，对有关多材料DED的当前研究机构进行了严格的评述。评估正在发展的研究趋势，设计方法，常见问题和挑战，并确定应指导进一步研究的领域。