Microstructure-Informed Analysis Framework for Lattice Structures: Guiding Topology-Material Synergy in Titanium Alloys

Abstract

This article discusses a microstructure-informed analysis framework for lattice structures that maps the material's microstructural response to guide topology selection and mechanical performance optimization. By coupling geometrical topology with intrinsic material behavior, we demonstrate how anisotropic microstructural response can inform the design of optimized lattice structures. To illustrate this concept, we focus on two distinct classes of titanium alloys: Ti5553 (Ti-5Al-5Mo-5V-3Cr wt%), which exhibits a predominantly $\beta$-phase microstructure, and Ti64 (Ti-6Al-4V wt%), which features a dual-phase $\alpha +\beta$ structure. These alloys exhibit markedly different mechanical responses under multiaxial loading in “fully dense” solid form. The strut-level stress analysis of these alloys reveals how specific microstructural characteristics can guide the selection of appropriate lattice topologies. Two representative lattice configurations, one stretching-dominated and one bending-dominated, are evaluated under identical loading conditions to explore how microstructure-driven design can lead to topology choices that are better suited to accommodate shear or other critical local stress states, thereby enhancing mechanical performance. A strut-level mechanics-based analysis is performed to evaluate shear stress distribution and highlight the role of topology-microstructure synergy and compatibility in determining overall lattice behavior. The findings emphasize the importance of designing structures that are both load-aware and microstructure-responsive, enabling more effective material utilization in advanced engineering applications.