Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7988476 | Intermetallics | 2016 | 12 Pages |
Abstract
The hierarchical evolution of the microstructure in an as-cast Al2CuCrFeNi2 alloy, across multiple length scales, was investigated by coupling scanning and transmission electron microscopy and atom probe tomography. This cast alloy undergoes a univariant eutectic dendritic solidification, which gives rise to a two-phase mixture of B2e (ordered BCC) and βe (disordered BCC) phases. The B2e phase forms a continuous matrix with the βe, being the minor phase, having a rod-like morphology. The B2e phase is further decomposed into B2f, Cu-plates, Cu-globules, and a small volume fraction of (Fe,Cr)-rich disordered βf2 regions. The βe phase further decomposed into Cu/B2s core/shell composite particles, where an ordered B2s shell surrounds a Cu-rich core. Most likely these Cu-rich cores act as heterogeneous nucleation sites for the B2s precipitates within the βf phase. This complex multi-scale decomposition process results in an intricate mixture of ordered and disordered solid solution phases.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
T. Borkar, B. Gwalani, D. Choudhuri, T. Alam, A.S. Mantri, M.A. Gibson, R. Banerjee,