Atomic-scale homogenization in an fcc-based high-entropy alloy via severe plastic deformation

作者：Yuan, Hao; Tsai, Ming-Hung; Sha, Gang; Liu, Fan; Horita, Zenji; Zhu, Yuntian^*; Wang, Jing Tao^*

来源：Journal of Alloys and Compounds, 2016, 686: 15-23.

DOI：10.1016/j.jallcom.2016.05.337

• High-entropy alloy
• Severe plastic deformation (SPD)
• High-pressure torsion
• Homogenization
• Atom probe tomography

The atomic-scale homogenization of a face-centered-cubic-based high-entropy alloy (HEA), Al0.3Cu0.5-CoCrFeNi, using severe plastic deformation (SPD) is reported. Atom probe tomography revealed that water quenching from high temperature cannot produce a homogeneous single phase, and clustering of Cu, Al and Ni still exists. Subsequent processing by high-pressure torsion produced nanostructured non-equilibrium single phase with homogeneous elemental distribution at atomic scale. Importantly, such a non-equilibrium single phase is stable at room temperature due to the sluggish diffusion kinetics. These observations suggest that SPD is an effective approach for producing single-phase HEAs for fundamental studies and applications.

• 出版日期2016-11-25
• 单位南京理工大学