New (Fe0.9Ni0.1)77Mo5P9C7.5B1.5 glassy alloys with enhanced glass-forming ability and large compressive strain

Fe-based bulk metallic glasses usually suffer from very poor ductility, which limits their industrial applications. In this work, we report about a new bulk metallic glass with superior glass-forming ability (GFA), produced by addition of a certain amount of Ni to a FeMoPCB composite alloy. The monolithic 1 mm diameter (Fe0.9Ni0.1)77Mo5P9C7.5B1.5 glassy alloy samples exhibit the highest ever reported compressive deformability (8.5%), together with a yield strength of 2940 MPa and an ultimate strength of 3260 MPa. Multiple shear bands are observed on the surface of the deformed specimens. The appropriate addition of Ni to the Fe77Mo5P9C7.5B1.5 alloy shifts the composition closer to the eutectic, lowers the liquidus temperature, and significantly enhances the GFA and the plastic strain of the alloys. Upon compression, the samples showed a ductile-brittle type fracture behavior.