Gyroid lattice structure with excellent mechanical properties and heat exchange properties fabricated by L-PBF
Yi Li, Xiaoqiang Wang, Xue Li, Xianglong Dai, Zekai Wang, Yuxuan Shi, Yan Zhou, Shifeng Wen, Yusheng Shi
Abstract
This paper presents a strategy for optimizing the forming quality, mechanical properties, and heat dissipation performance of Gyroid lattice structures by adjusting volume fraction and unit cell size. The goal is to provide a reference for the precise fabrication of components that require both high heat dissipation efficiency and mechanical strength. A mathematical model for the volume fraction deviation of Gyroid lattice structures is established. As volume fraction and unit cell size decrease, the specific surface area increases, exacerbating the deterioration of forming quality due to powder adhesion. Based on the Gibson-Ashby model, a power-law model is developed to describe the influence of volume fraction and unit cell size on the mechanical properties of AlMgScZr alloy Gyroid lattice structures. Peak plateau stress and compressive modulus are positively correlated with volume fraction and negatively correlated with unit cell size. Furthermore, computational fluid dynamics simulations are employed to analyze the effects of these parameters on heat dissipation performance. Optimal heat dissipation efficiency is achieved at a volume fraction of 30 % and a unit cell size of 6.0 mm. A high-volume-fraction lattice structure enhances heat exchange efficiency by improving the synergy between boundary heat conduction paths and pore vortex flow, while a smaller unit cell size improves heat dissipation by increasing the solid-gas convective heat transfer area and accelerating vortex flow within the pores.