This review analyses the design, mechanical behaviors, manufacturability, and application of gradient lattice structuresmanufactured via metallic additive manufacturing technology. By varying the design parameters such as cell size, strutlength, and strut diameter of the unit cells in lattice structures, a gradient property is obtained to achieve different levelsof functionalities and optimize strength-to-weight ratio characteristics. Gradient lattice structures offer variable densifi-cation and porosities; and can combine more than one type of unit cells with different topologies which results in differ-ent performances in mechanical behavior layer-by-layer compared to non-gradient lattice structures. Additivemanufacturing techniques are capable of manufacturing complex lightweight parts such as uniform and gradient latticestructures and hence offer design freedom for engineers. Despite these advantages, additive manufacturing has its ownunique drawbacks in manufacturing lattice structures. The rules and strategies in overcoming the constraints are dis-cussed and recommendations for future work were proposed.
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