The cube texture evolution of pure Ni during annealing

1. The cube texture evolution of pure Ni during annealing Liu Wei Li xiaoling Tsinghua University

2. Research background • Normal annealing • Electric field annealing • High magnetic field annealing

3. Research background Rolling assisted biaxially textured substrates

4. YBCO coated superconductor

5. Pole figure of {111} cube texture Nickel substrate

6. Nickel substrate Good space distribution Small misorientation Strong cube texture

7. Annealing Annealing Rolling reduction >95% Recrystallization Grain growth Cube texture forming process

8. Electric field annealing IF steel

9. Electric field annealing Al-Li alloy annealing in 450C for 3h (a) E＝2 kV (b) E=0KV

10. High magnetic field annealing • Retarded the recrystallization • Intensified the {100}<110> texture • Retarded the ND//<111> texture IF steel H=10 T

11. High magnetic field annealing Zn–1.1%Al alloy H=32 T Scripta Materialia 46 (2002) 857–862

12. High magnetic field annealing Zn–1.1%Al alloy H=32 T • without field; • oriented parallel to the field; • (c) tilted at +19° to • the field about the TD • (d) tilted at -19 ° to • the field about the TD.

13. Motivation For superconductor substrate material cube texture and grain size are important The evolution of cube texture • In normal annealing; • In an electric field annealing; • In a high magnetic field annealing.

14. ND 90μm RD TD 1cm 1cm Material Material： high pure Ni，purity is 99.999％ Reduction 98％ sample thickness is 90μm

15. Normal annealing Hardness curves for pure Ni annealed at 300ºC for different times

16. Cube texture evolution Cube texture evolution of pure Ni annealed at 300ºC for different times

17. Grain size Cube grain size and all grain size for pure Ni annealed at 300ºC for different times

18. 300℃/2h 300℃/35min 300℃/60min 300C-5min 300ºC-30min 200℃/2h 300℃/5min 300℃/20min 300C-60min 300C-120min Microstructure Dark to light shading indicates grains with orientations increasing deviations (up to 15) to {001}<100>. OIM maps of pure Ni annealed at 300ºC for different times

19. Electric field annealing Schematic illustration of the electric field annealing arrangement

20. Hardness Hardness curves for pure Ni annealed at 300ºC for different times in two different conditions

21. (a) 300ºC-0min 300ºC-30min 300ºC-120min (b) Microstructure (a) (b) Microstructureof pure Ni annealed at 300ºC for different times (a) E=0KV (b) E=2.0KV

22. Cube texture Cube texture fraction of pure Ni annealed at 300ºC for different times in the two different conditions

23. Grain size Grain size of pure Ni annealed at 300ºC for different times in the two different conditions

24. H sample ND High magnetic field annealing Experiment parameter H=10T 300℃/2h The magnetic treatment sketch map

25. Angles choice

26. Cube texture (average) The red line is the cube texture fraction without a magnetic field Average cube texture fraction of different angles to magnetic direction annealed at 300℃ for 2h in H=10T magnetic field

27. Grain size The red line is cube grain size and the green line is all grain size without magnetic field The grain size of different angles to magnetic field annealed at 300℃ for 2h in H=10T magnetic field

28. 300-2h-6(53.3º) 300-2h-0(0º) 300-2h-2(24º) 300-2h-4(35º) 300-2h-4(35º) 300-2h-8(57.6º) 300-2h-2(24º) 300-2h-6(53.3º) 300-2h-8(57.6º) 300-2h-9(90º) 300-2h-9(90º) Microstructure OIM maps of different angles to magnetic field annealed at 300℃ for 2h in H=10T magnetic field

29. Conclusion • In normal annealing, with the annealing time increasing, the cube texture fraction and cube oriented grain size increase; • Annealing in an electric field leads to smaller grain size for given annealing conditions compared with results without electric field annealing; • Annealing in an high magnetic field is a complicated process which include the cube texture evolution and magnetic field effect.

30. T h a n k s