9R phase enabled superior radiation stability of nanotwinned Cu alloys via in situ radiation at elevated temperature. (1st April 2019)

• Record Type: Journal Article
• Authors: Fan, Cuncai; Xie, Dongyue; Li, Jin; Shang, Zhongxia; Chen, Youxing; Xue, Sichuang; Wang, Jian; Li, Meimei; El-Azab, Anter; Wang, Haiyan; Zhang, Xinghang
• Is Part Of: Acta materialia. Volume 167(2019)
• Page Start: 248
• Page End: 256
• Publication Date: 2019-04-01
• Subjects: Nanotwins -- Radiation -- Detwinning -- 9R phase -- Solute drag; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2019.01.037
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: Nanotwinned metals exhibit outstanding radiation tolerance as twin boundaries effectively engage, transport and eliminate radiation-induced defects. However, radiation-induced detwinning may reduce the radiation tolerance associated with twin boundaries, especially at elevated temperatures. Here we show, via in-situ Kr ion irradiation inside a transmission electron microscope, that 3 at. % Fe in epitaxial nanotwinned Cu (Cu97 Fe3 ) significantly improves the thermal and radiation stability of nanotwins during radiation up to 5 displacements-per-atom at 200 °C. Such enhanced stability of nanotwins is attributed to a diffuse 9R phase resulted from the dissociation of incoherent twin boundaries in nanotwinned Cu97 Fe3 . The mechanisms for the enhanced stability of twin boundaries in irradiated nanotwinned alloys are discussed. The stabilization of nano-twins opens up opportunity for the application of nanotwinned alloys for aggressive radiation environments. Graphical abstract: Image 1