High impact toughness of CrCoNi medium-entropy alloy at liquid-helium temperature

• Published in: Scripta materialia Vol. 172; pp. 66 - 71
• Main Authors: Yang, Muxin, Zhou, Lingling, Wang, Chang, Jiang, Ping, Yuan, Fuping, Ma, Evan, Wu, Xiaolei
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.11.2019
• Subjects: Ductility; High-entropy alloy; Impact fracture toughness; Strain hardening; Twinning; Impact fracture toughness; Twinning; Ductility; Strain hardening; High-entropy alloy

We show that face-centered-cubic CrCoNi medium-entropy alloy sustains a Charpy V-notch impact toughness (AK) as high as 340 J at 4 K. Deformation twinning (DT) is rendered exceptionally profuse by this alloy's low stacking fault energy, combined with liquid-helium temperature and high strain ra...