Extremely high dislocation density and deformation pathway of CrMnFeCoNi high entropy alloy at ultralow temperature. (November 2020)

• Record Type: Journal Article
• Authors: Naeem, Muhammad; He, Haiyan; Harjo, Stefanus; Kawasaki, Takuro; Zhang, Fan; Wang, Bing; Lan, Si; Wu, Zhenduo; Wu, Yuan; Lu, Zhaoping; Liu, Chain T.; Wang, Xun-Li
• Is Part Of: Scripta materialia. Number 188(2020)
• Page Start: 21
• Page End: 25
• Publication Date: 2020-11
• Subjects: High entropy alloy -- Plastic deformation -- Neutron diffraction -- Dislocation density -- Stacking faults; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.07.004
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The deformation behavior of CrMnFeCoNi high entropy alloy was investigated by in situ neutron diffraction at an ultralow temperature of 15 K. Analysis of the diffraction peak widths showed an extremely high dislocation density at 15 K, reaching ~10 16 m −2 . In addition, the dislocation density was found to closely follow the development of texture caused by deformation. In contrast to deformation by dislocation slip at room temperature, the ultralow-temperature deformation also involved stacking faults, twinning and serrations. The deformation pathway at ultralow temperature is outlined which is responsible for the extraordinary strength–ductility combination. Graphical abstract: Image, graphical abstract