Influence of the micro-alloying of Cu and the partial substitution of Fe by Ni on mechanical properties was investigated in Fe-Nb-B-(Ni, Cu) bulk metallic glasses (BMGs). When the addition of Cu content was properly adjusted with 0.5 at.%, the (Fe 0.71Nb 0.06B 0.23) 99.5Cu 0.5 alloy exhibits enhanced plasticity of 4.5% due to the precipitation of nano-scale particles. Meanwhile, the partial replacement of Ni for Fe also effectively improves the plastic strain caused by tuning the elastic constants. The (Fe 0.5Ni 0.5) 71Nb 6B 23 alloy with 1:1 Ni-to-Fe concentration ratio shows a large Poisson's ratio (0.356) and a pronounced plastic strain of 4.2%. These results indicate the improved room temperature plasticity of Fe-Nb-B-(Ni, Cu) BMGs can be achieved by the appropriate control of the heterogeneity and intrinsic elastic properties.
Bibliographical noteFunding Information:
The authors are grateful to G. Wang, M. Stoica, O. Shuleshova, R. Li, S. Pauly, S. Scudino, U. Kühn, and W.T. Kim for valuable discussions. This work was supported by the Defense Acquisition Program Administration (DAPA) and the Agency for Defense Development (ADD) , and also supported by the Global Research Laboratory Program of the Korea Ministry of Science and Technology , and by the Center for Advanced Materials Processing (CAMP) of the 21st Century Frontier R&D Program of the Korea Ministry of Knowledge Economy .
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry