Crack-free Cu9Ni6Sn strips via twin-roll casting and subsequent asymmetric cryorolling

• Published in: Materialia Vol. 21; p. 101283
• Main Authors: Wang, Lin, Tang, Delin, Kong, Charlie, Yu, Hailiang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-03-2022
• Subjects: Copper alloys; Electron backscattering diffraction; Fracture; Rolling; Segregation; Rolling; Electron backscattering diffraction; Fracture; Segregation; Copper alloys
• ISSN: 2589-1529; 2589-1529
• DOI: 10.1016/j.mtla.2021.101283

CuNiSn alloys often generate cracks during traditional deformation. In this study, we report the development of the crack-free Cu9Ni6Sn strips by using twin-roll casting with subsequent asymmetric cryorolling. Although cracks appear in asymmetric hot-rolled and asymmetric room-temperature-rolled strips, no cracks were observed in asymmetric cryorolled (173 K and 83 K) strips. Electron back-scattered diffraction images indicate that deformation is relatively uniform for asymmetric cryorolled strips, with obvious shear bands appearing in asymmetric room-temperature-rolled and asymmetric hot-rolled strips. Energy dispersive spectroscopy images show that the segregation of Sn element appears near cracks in asymmetric hot-rolled and asymmetric room-temperature-rolled strips. The Sn element is uniformly distributed in asymmetric cryorolled strips. Uniform deformation, reduced Sn element segregation, and enhanced ductility at cryogenic temperature all contribute to the crack-free nature of the Cu9Ni6Sn strips prepared by asymmetric cryorolling.
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