| 1. |
- Archana, M. S., et al.
(författare)
-
Influence of applied pressure during field-assisted sintering of Ti(C,N)-WC-FeAl based nanocomposite
- 2015
-
Ingår i: Ceramics International. - 0272-8842 .- 1873-3956. ; 41:2, s. 1986-1993
-
Tidskriftsartikel (refereegranskat)abstract
- Ti(C,N)-WC-FeAl based nanocomposites are processed by field-assisted sintering at 1500 degrees C. The phase and microstructural evolution during the process under the influence of different applied pressures of 30, 50 and 100 MPa are studied using x-ray diffraction and scanning electron microscopy. Lattice parameters of (Ti,W)(C,N) solid solution and binder phases after sintering are found to vary with applied pressure. The nanocomposite grains are observed to possess a core-rim microstructure. Microstructural variations in terms of type, size and fraction of "corerim" structure as a function of applied pressure are investigated. The hardness and indentation fracture toughness values are in the range of 17.6-18.4 GPa and 5.9-6.8 MPa root m, respectively. These values are comparable with those reported for Ti(C,N)-based composites with metal binder. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
|
|
| 2. |
- Archana, M. S., et al.
(författare)
-
Nanocrystalline Phases During Mechanically Activated Processing of an Iron (Fe) Aluminum (40 at% Al) Alloy
- 2014
-
Ingår i: Materials and Manufacturing Processes. - 1042-6914 .- 1532-2475. ; 29:7, s. 864-869
-
Tidskriftsartikel (refereegranskat)abstract
- Influence of processing conditions on in situ generation of nanocrystalline Fe(3)AlCx and Fe-Al phases during mechanically activated annealing and sintering of Fe-40 at% Al alloy was evaluated. Fe(3)AlCx, Fe3Al and ordered FeAl phases evolved even at a low temperature of 400 degrees C. The presence of carbide phase was attributed to the free carbon originating from the organic process control agent while its formation at low temperature was correlated to fast diffusion of C in the lattice assisted by the nanocrystalline structure coupled with the presence of thermal vacancies in the Fe-40 at% Al alloy. The as-sintered composite showed improved mechanical properties.
|
|
| 3. |
- Archana, M. S., et al.
(författare)
-
Rapid consolidation of FeAl-Fe3AlCx ultrafine composites by mechanically activated field-assisted technique
- 2014
-
Ingår i: Materials Science & Engineering. - 0921-5093 .- 1873-4936. ; 611, s. 298-305
-
Tidskriftsartikel (refereegranskat)abstract
- Rapid sintering of FeAl based ultrafine composites by a mechanically activated field-assisted process was evaluated. The influence of applied load and isothermal holding time on the as-sintered microstructure and mechanical properties was investigated. Hardness of the nanocomposite was determined by micro- and nano-indentation techniques, while the grain size was ascertained from electron backscatter diffraction and image analysis of scanning electron micrographs. A higher applied load as well as the isothermal holding time led to better dispersion of the in situ grown Fe3AlCx carbide particles in FeAl matrix. Significant improvement in the hardness and marginal rise in elastic constant were also observed in the fast sintered ultrafine composites when compared to previous reports. The increase in hardness was attributed to the presence of a carbide phase and fine-grained microstructure. (C) 2014 Elsevier B.V. All rights reserved.
|
|
