Spinodal decomposition and mechanical response of a TiZrNbTa high-entropy alloy

Tai You Liu, Jacob C. Huang, Wen Shuo Chuang, Hung Sheng Chou, Jui Yu Wei, Chih Yeh Chao, Yu Chin Liao, Jason S.C. Jang

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Abstract

In this study, the effects of spinodal decomposition on the microstructures and mechanical properties of a TiZrNbTa alloy are investigated. The as-cast TiZrNbTa alloy possesses dual phases of TiZr-rich inter-dendrite (ID) andNbTa-rich dendrite (DR) domains, both of which have a body-centered cubic (BCC) structure. In the DRs of the as-cast alloy, the α and ω precipitates are found to be uniformly distributed. After homogenization at 1100 °C for 24 h followed by water quenching, spinodal decomposition occurs and an interconnected structure with a wavelength of 20 nm is formed. The α and ω precipitates remained in the structure. Such a fine spinodal structure strengthens the alloy effectively. Detailed strengthening calculations were conducted in order to estimate the strengthening contributions from the α and ω precipitates, as well as the spinodal decomposition microstructure.

Original languageEnglish
Article number3508
JournalMaterials
Volume12
Issue number21
DOIs
StatePublished - 1 Nov 2019

Keywords

  • High entropy alloy
  • Precipitate
  • Spinodal decomposition
  • Strengthening

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