The high dehydrogenation temperature of magnesium-based hydride (MgH2) is still a challenge as a potential hydrogen storage material in automobile applications. To improve the hydrogen desorption properties of MgH2; we selected TiFe0.8Mn0.2, graphite and Fe as additives. We prepared the Mg-graphite, Mg-TiFe0.8Mn0.2-Fe, Mg-TiFe0.8Mn0.2-graphite, Mg-Fe-graphite and Mg-TiFe0.8Mn0.2-Fe-graphite composites with high-energy ball milling under argon atmosphere. We investigated the effects of graphite and Fe addition to the desorption mechanism of TiFe0.8Mn0.2 using X-ray diffractometer (XRD), scanning electron microscope, differential scanning calorimeter and pressure-composition-temperature measurements using Sievert apparatus. We observed MgH2 in Mg-TiFe0.8Mn0.2-graphite, Mg-Fe-graphite and Mg-TiFe0.8Mn0.2-Fe-graphite with XRD analyses after hydrogenation at 200 degrees C under a hydrogen pressure of 2.5-2.6 MPa. As compared to pure milled MgH2 powder, we found that the dehydrogenation peak temperatures are decreased by 90, 160 and 165 degrees Cfor Mg-TiFe0.8Mn0.2-graphite, Mg-Fe-graphite, and Mg-TiFe0.8Mn0.2-Fe-graphite composites, respectively. The co-addition of TiFe0.8Mn0.2, graphite, and Fe exhibit the synergistic effects in improving the hydrogen desorption properties of MgH2. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.