Glass formation, thermal properties and mechanical behavior were investigated in a series of Fe65-xMn13B17Y 5Nbx (x = 0, 3, 5 and 7) alloys. Appropriate partial substitution of Fe by Nb in a Fe65-xMn13B 17Y5 bulk glassy alloy simultaneously enhances the glass-forming ability and the mechanical properties of the alloys. The Nb-containing glassy alloys exhibit an additional exothermic event in the supercooled liquid region. This exothermic reaction is correlated with the formation of medium range ordered (MRO) clusters originated from the large difference in mixing enthalpy between constituent elements such as Nb-Y (+30 kJ/mol) and Nb-B (-39 kJ/mol). The presence of MRO clusters in the as-cast state is dependent on the cooling condition from the liquid state, and plays a crucial role in providing plasticity in as-cast Fe-Mn-B-Y-Nb bulk metallic glass.
Bibliographical noteFunding Information:
The authors are grateful to Dr. R. Li, G. Wang (IFW-Dresden) for valuable discussions. This work was supported by the Global Research Laboratory Program of the Korea Ministry of Education, Science and Technology.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics