An enhancement of plasticity in high strength ultrafine eutectic Fe-Nb composites has been accomplished by introducing heterogeneities in length-scale of the microstructure. Addition of Al acting as a stabilizer for the α-Fe phase in the Fe-Nb composites results in the formation of a larger volume fraction of primary α-Fe phase and an ultrafine eutectic structure with reduced lamellar spacing. As a result, Fe-Nb-Al composites exhibit a good combination of fracture strength and plasticity. Due to the presence of the solution hardened α-Fe phase, the Fe-Nb-Al composites exhibit significantly enhanced work hardening behavior at room temperature.
Bibliographical noteFunding Information:
The authors are grateful to T.E. Kim, S.W. Sohn, J.H. Na and K.T. Kim for valuable discussions. This work was supported by the Global Research Laboratory Program of Korea Ministry of Science and Technology. J.M. Park acknowledges the support from the Second Stage of Brain Korea 21 Project in 2007.
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry