The cube texture evolution of pure ni during annealing
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The cube texture evolution of pure Ni during annealing. Liu Wei Li xiaoling Tsinghua University. Research background Normal annealing Electric field annealing High magnetic field annealing. Research background. Rolling assisted biaxially textured substrates. YBCO coated superconductor.

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The cube texture evolution of pure ni during annealing

The cube texture evolution of pure Ni during annealing

Liu Wei

Li xiaoling

Tsinghua University


The cube texture evolution of pure ni during annealing


Research background
Research background

Rolling assisted biaxially textured substrates



Nickel substrate

Pole figure of

{111} cube texture

Nickel substrate


Nickel substrate1
Nickel substrate

Good

space distribution

Small

misorientation

Strong

cube texture


Cube texture forming process

Annealing

Annealing

Rolling

reduction >95%

Recrystallization

Grain growth

Cube texture forming process



Electric field annealing1
Electric field annealing

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


High magnetic field annealing
High magnetic field annealing

  • Retarded the recrystallization

  • Intensified the {100}<110> texture

  • Retarded the ND//<111> texture

IF steel

H=10 T


The cube texture evolution of pure ni during annealing

High magnetic field annealing

Zn–1.1%Al alloy

H=32 T

Scripta Materialia 46 (2002) 857–862


High magnetic field annealing1
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.


Motivation
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.


Material

ND

90μm

RD

TD

1cm

1cm

Material

Material:

high pure Ni,purity is 99.999%

Reduction 98%

sample thickness is 90μm


Normal annealing
Normal annealing

Hardness curves for pure Ni annealed at 300ºC for different times


Cube texture evolution
Cube texture evolution

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


Grain size
Grain size

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


Microstructure

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


Electric field annealing2
Electric field annealing

Schematic illustration of the electric field annealing arrangement


Hardness
Hardness

Hardness curves for pure Ni annealed at 300ºC

for different times in two different conditions


Microstructure1

(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


Cube texture
Cube texture

Cube texture fraction of pure Ni annealed at 300ºC

for different times in the two different conditions


Grain size1
Grain size

Grain size of pure Ni annealed at 300ºC

for different times in the two different conditions


The cube texture evolution of pure ni during annealing

H

sample

ND

High magnetic field annealing

Experiment parameter

H=10T

300℃/2h

The magnetic treatment sketch map



Cube texture average
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


Grain size2
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


The cube texture evolution of pure ni during annealing

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


The cube texture evolution of pure ni during annealing

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.