Mg based bulk metallic glasses: Glass transition temperature and elastic properties versus toughness

► The best glass formers are optimized in the Mg-(Cu/Ni)-Nd systems. ► In contrast to the Mg57Cu34Nd9 BMG, Mg64Ni21Nd15 BMG manifests higher toughness. ► Fracture surface of Mg64Ni21Nd15 during 3PB varies along the crack propagation path. ► Correlation between Tg and elastic properties was rationalized with Egami's model.