The evolution of compositional and microstructural heterogeneities in a TaMo0.5ZrTi1.5Al0.1Si0.2 high entropy alloy

Yueling Guo, Junyang He*, Wenjun Lu, Lina Jia, Zhiming Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

We report the chemical segregation and the phase decomposition as well as the microstructural response upon plastic deformation in a TaMo0.5ZrTi1.5Al0.1Si0.2 (at.%) refractory high entropy alloy (RHEA) by combining the thermodynamic calculation and the multiple experimental characterization techniques down to near-atomic scales. The alloy's compositional and microstructural heterogeneities under different processing conditions, including casting, annealing and room/high temperature compression, are emphasized. Results show that casting creates the original compositional heterogeneity with evident dendritic microstructures. The dendrite consists of a single body-centered-cubic (BCC) phase enriched with Ta and Mo. The interdendritic region is delineated by Zr, Ti, Al and Si, with the formation of rod-like BCC/silicide eutectics. After annealing at 1300 °C for 48 h, both dendritic and interdendritic BCC phases experience evident phase decomposition and elemental redistribution. This leads to the increase of compressive strength at room temperature to ~2050 MPa, which is ~300 MPa higher compared to that of the as-cast material.

Original languageEnglish
Article number110836
JournalMaterials Characterization
Volume172
DOIs
Publication statusPublished - Feb 2021

Keywords

  • Dynamic recrystallization
  • Mechanical property
  • Microstructural heterogeneity
  • Phase decomposition
  • Refractory high entropy alloy

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