Grain Growth Mechanism of Lamellar-Structure High-Purity Nickel via Cold Rolling and Cryorolling during Annealing

Zhide Li; Yuze Wu; Zhibao Xie; Charlie Kong; Hailiang Yu

doi:10.3390/ma14144025

Grain Growth Mechanism of Lamellar-Structure High-Purity Nickel via Cold Rolling and Cryorolling during Annealing

Materials (Basel). 2021 Jul 19;14(14):4025. doi: 10.3390/ma14144025.

Authors

Zhide Li^{1

2}, Yuze Wu^{2

3}, Zhibao Xie³, Charlie Kong⁴, Hailiang Yu^{1

2

3}

Affiliations

¹ Light Alloys Research Institute, Central South University, Changsha 410083, China.
² State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China.
³ College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China.
⁴ Mark Wainwright Analytical Centre, University of New South Wales, Sydney, NSW 2052, Australia.

Abstract

High-purity (99.999%) nickel with lamellar-structure grains (LG) was obtained by room-temperature rolling and cryorolling in this research, and then annealed at different temperatures (75 °C, 160 °C, and 245 °C). The microstructure was characterized by transmission electron microscopy. The grain growth mechanism during annealing of the LG materials obtained via different processes was studied. Results showed that the LG high-purity nickel obtained by room-temperature rolling had a static discontinuous recrystallization during annealing, whereas that obtained by cryorolling underwent static and continuous recrystallization during annealing, which was caused by the seriously inhibited dislocation recovery in the rolling process under cryogenic conditions, leading to more accumulated deformation energy storage in sheets.

Keywords: annealing; cryorolling; grain growth; high-purity nickel; lamellar-structure grains.

Grants and funding

2018RS3015/Huxiang High-Level Talent Gathering Project of HUNAN Province