Bulk Ti-Fe-(In, Nb) composites with high strength (∼2350 ± 50 MPa) and reasonably good ductility (plastic strain ∼4.5 ± 0.5%) have been produced in the form of 2 mm as-cast rods. Analysis of the microstructure by X-ray diffractometry, scanning electron microscopy and transmission electron microscopy indicates that it consisted of β-Ti dendrites as a primary phase and Ti (Fe, In and/or Nb) (B2) + β-Ti (A2) as eutectic phase. Modification of atomic structure, degree of eutectic structure refinement and volume fraction of the constituent phases with the addition of In and Nb are the crucial factors in enhancing the mechanical properties of Ti-Fe-(In, Nb) composites.
Bibliographical noteFunding Information:
This work was supported by DAPA and ADD, and also supported by the Global Research Laboratory program of Korea Ministry of Science and Technology. The authors are grateful to K. Chattopadhyay, Eric Fluery, K.B. Kim, N.K. Mukhopadhyay, U. Ramamurty and J.M. Park for valuable discussion. Authors also acknowledge to Dr. Gabriel Caruntu for his help in refinement of XRD patterns. One of the authors (D.K. Misra) gratefully acknowledges the financial support provided by the Korean Ministry of Education under grant BK-21 programmed.
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry