Hierarchical multi-scale microstructural evolution in an as-cast Al2CuCrFeNi2 complex concentrated alloy

T. Borkar, B. Gwalani, D. Choudhuri, T. Alam, A. S. Mantri, M.A. Gibson, R. Banerjee

Research output: Contribution to journalArticleResearchpeer-review

17 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)31-42
Number of pages12
JournalIntermetallics
Volume71
DOIs
Publication statusPublished - 1 Apr 2016

Keywords

  • Atom probe
  • High entropy alloys
  • Solidification
  • TEM

Cite this