Significant hardening due to the formation of a sigma phase matrix in a high entropy alloy

By Ming-Hung Tsai, Hao Yuan, G. Cheng, Weizong Xu, W. Jian, Ming-Hao Chuang, Chien-Chang Juan, An-Chou Yeh, Su-Jien Lin, Yuntian Zhu. 2013

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Design and tensile properties of a bcc Ti-rich high-entropy alloy with transformation-induced plasticity (2017, result): “unlike recent studies of fcc HEAs,[10,11] and to the authors’ best knowledge, published results dealing with hardening precipitation for bcc HEAs are limited to the AlCrMnFeNi system with still complicated or ambiguous hardening mechanisms [12,13]; up to now, no systematic studies are reported for r”
Criterion for Sigma Phase Formation in Cr- and V-Containing High-Entropy Alloys (2013, background): “5 alloy, the dendrite region is composed of B2 precipitates embedded in a BCC matrix.[13] During annealing at 700◦C, the BCC matrix”
Design of a twinning-induced plasticity high entropy alloy (2015, background): “This enables avoiding the Cr-rich r intermetallic phase that has often been observed in high Cr-containing steels [48] and in many HEA systems with a high amount of Cr [25,26,49].”
Mechanical properties, microstructure and thermal stability of a nanocrystalline CoCrFeMnNi high-entropy alloy after severe plastic deformation (2015, background): “5 alloy an increase in hardness has been associated with the formation of new phases after heat treatment where the entire matrix undergoes a phase transformation into a significantly harder phase [45].”
High-Entropy Alloys: A Critical Review (2014, background): “[34,35] This indicates that TEM analysis is needed to really confirm the existence of SOP.[34,35]”