Tuning of microstructure by addition of austenite stabilizers effectively enhances the mechanical properties in Fe-Nb-(Ni-Mn) dendrite-ultrafine eutectic composites. The Fe93Nb7 alloy displays the improved plasticity up to 10 pct due to the introduction of a ductile a-Fe dendrite into the ultrafine eutectic matrix. Meanwhile, the Fe78Nb7Ni10Mn5 alloy, which forms an in-situ martensitic a-Fe dendritic phase reinforced ultrafine eutectic composite exhibits excellent combination of a high fracture strength of 1.6 GPa and a large plastic strain of 11 pct. The investigations reveal that the characteristics of the modulated primary dendrites in the dendriteultrafine eutectic composites play an important role in manipulating the generation and propagation of shear bands, thus resulting in the improved mechanical properties and plastic deformation behavior.
|Number of pages||7|
|Journal||Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science|
|Publication status||Published - 2012 Aug|
Bibliographical noteFunding Information:
This work was supported by the Defense Acquisition Program Administration (DAPA), the Agency for Defense Development (ADD), the Global Research Laboratory Program of the Korea Ministry of Science and Technology, and 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 the Brain Korea 21 Project in 2010. Stimulating discussions with K.B. Kim, K.R. Rim, M. Stoica, N. Mattern, S. Pauly, and S. Scudino are gratefully acknowledged.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys