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Understanding the microstructure and mechanical properties of TaxAl0.7CoCrFeNi2.1 eutectic high entropy composites: Multi-scale deformation mechanism analysis.
- Source :
-
Composites: Part B, Engineering . Jun2021, Vol. 214, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
-
Abstract
- The analyses of phase composition, microstructure and the mechanical properties were conducted for as-cast Ta x Al 0.7 CoCrFeNi 2.1 (x = 0.3, 0.5, 0.6 and 0.7) eutectic high entropy composites (EHECs). With the x value increases from 0.3 to 0.6, the phases of dendrite changed from L1 2 to B2 and volume fraction of ultrafine-eutectic matrix consisting of Face-centered cubic and Laves phases increased. When x = 0.7, the Laves phase appears as the primary dendrite and the matrix region changed into the bimodal eutectic structure (L1 2 + Laves and B2 + Laves). Thermo-physical parameters could be used for understanding phase formation in EHECs. Experimental and theoretical comparison using thermo-physical parameters shows a reasonable consistency. Depending on the microstructural variation, the yield strength increased from 1304 MPa (x = 0.3) to 2154 MPa (x = 0.6) and plasticity decreased from 17% (x = 0.5) to 4% (x = 0.6). In order to understand the nano-to-micronscale deformation mechanisms depending on the microstructural variations, the systematic investigations of post-deformed samples (x = 0.5 and 0.6) were carried out by multi-scale SEM, TEM, and AFM analyses. [Display omitted] [ABSTRACT FROM AUTHOR]
- Subjects :
- *DEFORMATIONS (Mechanics)
*MICROSTRUCTURE
*EUTECTIC structure
*ENTROPY
*DENDRITES
Subjects
Details
- Language :
- English
- ISSN :
- 13598368
- Volume :
- 214
- Database :
- Academic Search Index
- Journal :
- Composites: Part B, Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 149474101
- Full Text :
- https://doi.org/10.1016/j.compositesb.2021.108750