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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. - PowerPoint PPT Presentation
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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
Nickel substrate
Pole figure of {111} cube texture
Nickel substrate
Strong cube texture
Small misorientation
Good space distribution
Cube texture forming process
Rolling reduction >95%
Recrystallization Grain growth
Annealing Annealing
Electric field annealing
IF steel
Electric field annealing
Al-Li alloy annealing in 450C for 3h (a) E = 2 kV (b) E=0KV
High magnetic field annealing
Retarded the recrystallization Intensified the {100}<110> texture Retarded the ND//<111> texture
IF steel H=10 T
Zn–1.1%Al alloy
Scripta Materialia 46 (2002) 857–862
H=32 T
High magnetic field annealing
Zn–1.1%Al alloy
(a) without field;(b) 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.
H=32 T
High magnetic field annealing
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
Material : high pure Ni , purity is 99.999 % Reduction 98 % sample thickness is 90μm
ND
RDTD
90μm
1cm1cm
Normal annealing
0 20 40 60 80 100 12060
80
100
120
140
160
180
200
220
240
260
280
300℃
HV
Annealing time (min)
Hardness curves for pure Ni annealed at 300ºC for different times
Cube texture evolution
0 20 40 60 80 100 120
0
10
20
30
40
50
60
70
80
90
Cu
be
te
xtu
re f
ract
ion
(%
)
Annealing time (min)
Cube texture evolution of pure Ni annealed at 300ºC for different times
Grain size
0 20 40 60 80 100 120
4
6
8
10
12
14
16
18
20
22
24gr
ain
siz
e (μ
m)
Annealing time (min)
cube grain size all grain size
Cube grain size and all grain size for pure Ni annealed at 300ºC for different times
Microstructure
OIM maps of pure Ni annealed at 300ºC for different times
300C-5min 300ºC-30min
300C-60min 300C-120min
Dark to light shading indicates grains with orientations increasing deviations (up to 15) to {001}<100>.
Electric field annealing
Schematic illustration of the electric field annealing arrangement
Hardness
Hardness curves for pure Ni annealed at 300ºC for different times in two different conditions
Microstructure
(a) (b)300ºC-0min 300ºC-30min 300ºC-120min
(a)
(b)
Microstructure of pure Ni annealed at 300ºC for different times (a) E=0KV (b) E=2.0KV
Cube texture
Cube texture fraction of pure Ni annealed at 300ºC for different times in the two different conditions
Grain size
Grain size of pure Ni annealed at 300ºC for different times in the two different conditions
High magnetic field annealing
H
sampleND
The magnetic treatment sketch map
Experiment parameterH=10T
300℃/2h
Angles choice
Cube texture (average)
-10 0 10 20 30 40 50 60 70 80 90 10025
30
35
40
45
50
55
60
65
70
75
80
85
90
cub
e te
xtu
re f
ract
ion
(av
e)
angle to magnetic direction
Average cube texture fraction of different angles to magnetic
direction annealed at 300℃ for 2h in H=10T magnetic field
The red line is the cube
texture fraction without a
magnetic field
Grain size
-10 0 10 20 30 40 50 60 70 80 90 100
8
10
12
14
16
18
20
22
24
26
28
grai
n s
ize
(μm
)
angle to magnetic direction
cube grain size all 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
Microstructure
OIM maps of different angles to magnetic field annealed at 300℃ for 2h in H=10T magnetic field
300-2h-0(0º) 300-2h-2(24º) 300-2h-4(35º)
300-2h-6(53.3º) 300-2h-8(57.6º) 300-2h-9(90º)
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.
T h a n k sT h a n k s