An in situ formed martensitic dendrite reinforced Fe-11Nb-10Ni-5Mn ultrafine composite was developed by copper mold casting. This new class of ultrafine composite composed of micrometer-scale martensitic α'-Fe dendrites and ultrafine-scale alternating eutectics exhibits a high fracture strength of 1.6. GPa and a large compressive plasticity up to 10.5%. These excellent mechanical properties originate from the precipitation of the martensitic α'-Fe dendrites containing numerous nanometer-scale laths which are effective to generate multiple shear banding and restrict the rapid propagation of localized shear bands.
Bibliographical noteFunding Information:
This work was supported by Defense Acquisition Program Administration (DAPA) and Agency for Defense Development (ADD) , and also supported by the Global Research Laboratory Program of 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 . T.E. Kim acknowledges the support from the Second Stage of Brain Korea 21 Project in 2010. Stimulating discussions with J.H. Han, M. Stoica, N. Mattern, S. Pauly and S. Scudino are gratefully acknowledged.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering