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Open AccessArticle

Spinodal Decomposition and Mechanical Response of a TiZrNbTa High-Entropy Alloy

1
Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung 804, Taiwan
2
Institute for Advanced Study, Department of Materials Science & Engineering, City University of Hong Kong, Kowloon, Hong Kong, China
3
Department of Mechanical Engineering, National Pingtung University of Science and Technology, Pingtung 912, Taiwan
4
Department of Mechanical Engineering, National Central University, Taoyuan 320, Taiwan
5
Institute of Materials Science and Engineering, National Central University, Taoyuan 320, Taiwan
*
Author to whom correspondence should be addressed.
Materials 2019, 12(21), 3508; https://doi.org/10.3390/ma12213508
Received: 6 October 2019 / Revised: 23 October 2019 / Accepted: 24 October 2019 / Published: 25 October 2019
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) and NbTa-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. View Full-Text
Keywords: high entropy alloy; spinodal decomposition; strengthening; precipitate high entropy alloy; spinodal decomposition; strengthening; precipitate
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MDPI and ACS Style

Liu, T.-Y.; Huang, J.C.; Chuang, W.-S.; Chou, H.-S.; Wei, J.-Y.; Chao, C.-Y.; Liao, Y.-C.; Jang, J.S. Spinodal Decomposition and Mechanical Response of a TiZrNbTa High-Entropy Alloy. Materials 2019, 12, 3508.

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