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