1.General Introduction 1.1 Motivation and Scope of Complex Materials 1.2 An Overview of Metallic Glasses 1.3 Processing of Metallic Glasses 1.4 Mechanical Property Enhancement in MG Composites 1.5 References 2. Fabrication Methods of MG Artificial Microstructures 2.1 Metallic Glass Alloy Synthesis 2.2 Silicon Mold Fabrication 2.3 Fabrication Methods of Artificial Microstructures 2.4 Conclusions 2.5 References 3. Structural Characterization of Metallic Glasses 3.1 Formability Test 3.2 Thermal Analysis 3.3 Structural Analysis 3.4 Bend Test 3.4 Conclusions 3.5 References 4. Artificial Microstructure Approach 4.1 Objectives 4.2 Periodic Cellular Structures of Metallic Glasses 4.2.1 MG Cellular Structure Sample 4.2.2 In-Plane Compression Test 4.2.3 Euler Buckling Instability 4.2.4 Results and Discussion 4.2.4.1 Deformation Regions of MG Cellular Structures 4.2.4.2 Manipulation of Geometry 4.2.4.3 Cellular Structures of Different Materials 4.2.4.4 Energy Absorption Capacity 4.2.4.5 Microstructural Optimization 4.2.4.6 Embrittlement of MGs 4.2.4.7 Comparison with Numerical Simulations 4.2.4.8 Mechanical Characterization under Uniaxial Tension 4.2.4.9 Mechanical Characterization at Different Orientations 4.2.5 General Findings & Conclusions 4.3 Toughening Mechanisms in Metallic Glasses 4.3.1 Uniaxial Tensile Test 4.3.1.1 Effect of Pore Size 4.3.1.2 Effect of Morphology 4.3.1.3 Effect of Pore Spacing 4.3.1.4 Effect of Pore Shape 4.3.1.5 Effect of Material Type 4.3.1.6 Effect of Pore Number 4.3.1.7 Effect of Electroplating 4.3.1.8 Microscopic Analysis of the Deformation Mechanism 4.3.1.9 Mechanical Property Optimization through d/s 4.3.1.10 Comparison with Numerical and Empirical Models 4.3.1.11 Effect of Isothermal Annealing on Mechanical Properties 4.3.2 Investigation of MG Composites Using FEM Analysis 4.3.3 General Findings & Conclusions 4.4 References 5. General Conclusions and Outlook 5.1 General Conclusions 116 5.2 Push the Limit: 3D Metallic Glass Structures 5.3 Multiple Material Artificial Microstructures 5.4 Non-Periodic Cellular Structures & Flaw Tolerance 5.5 Algorithmic Topological Optimization 5.6 Fracture Toughness in MG Heterostructures 5.7 Other Application Fields of MG Heterostructures 5.8 References.