Texture Evolution in Ni Substrate Prepared by Powder Metallurgy and Casting Methods

2007 ◽  
Vol 534-536 ◽  
pp. 1605-1608
Author(s):  
Jun Hyung Lim ◽  
Kyu Tae Kim ◽  
Eui Cheol Park ◽  
Jin Ho Joo ◽  
Hyoung Sub Kim ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Annealing Temperature ◽  
Texture Evolution ◽  
Cube Texture ◽  
Coated Conductors ◽  
Reduction Ratio ◽  
The Other ◽  
X Ray ◽  
Ni Substrate ◽  
Ybco Coated Conductors

Cube textured Ni substrate were fabricated for YBCO coated conductors from the initial specimens prepared by powder metallurgy (P/M) and casting and the effects of annealing temperature and reduction ratio on texture formation and microstructural evolutio were evaluated. The initial specimens were rolled by 98.6% and 99.2% reduction ratio and then annealed in the temperature range of 600°C to 1200°C. The microstructure and texture were evaluated by optical microscopy and X-ray pole-figure analysis. We observed that microstructure of the initial specimen varied with preparation methods.Texture analysis indicated that a strong cube texture formed for substrate made by P/M, and the degree of texture did not significantly vary with annealing temperature of 600°C~1100°C. On the other hand, the texture of substrate made by casting was more dependent on the annealing temperature and twin texture ({221}<221>) and several minor texture components started to form at 1000°C. In addition, the texture of substrate made by P/M was significantly dependent on the reduction ratio.

Evolution of Cube Texture in Cu-45at.%Ni Alloy Substrates for YBCO Coated Conductors

2015 ◽  
Vol 778 ◽  
pp. 105-109
Author(s):  
Hui Tian ◽  
Yi Wang ◽  
Pan Wang ◽  
Ya Ru Liang ◽  
Lin Ma ◽  
...  
Keyword(s):  
Grain Growth ◽  
Texture Evolution ◽  
Cube Texture ◽  
Rolling Texture ◽  
Coated Conductors ◽  
Recrystallization Process ◽  
Ni Alloy ◽  
Back Scattering ◽  
Cold Rolled ◽  
Ybco Coated Conductors

The cube texture evolution during annealing of the heavy cold-rolled Cu-45at.%Ni alloy tapes were investigated by XRD and electron back scattering diffraction techniques. The results indicated that the fraction of Copper-type rolling texture was slightly strengthened during recovery, and then strongly reduced during recrystallization. The cube texture was formed by consuming the rolling texture components during recrystallization process, and the S, Copper and Brass orientations were consumed together via cube grain growth. A strong cube-textured Cu-45at.%Ni alloy substrate with the cube texture fraction of 98.6 % (< 10°) was obtained after annealing at 1000 oC for 1 h.

Cube Texture Formation of Cu-33at.%Ni Alloy Substrates and CeO2 Buffer Layer for YBCO Coated Conductors

2014 ◽  
Vol 887-888 ◽  
pp. 345-348 ◽  
Author(s):  
Hui Tian ◽  
Hong Li Suo ◽  
Ya Ru Liang ◽  
Yue Zhao ◽  
Lin Ma ◽  
...  
Keyword(s):  
Buffer Layer ◽  
Full Width Half Maximum ◽  
Cube Texture ◽  
Coated Conductors ◽  
Texture Formation ◽  
Solution Deposition ◽  
X Ray ◽  
Ni Alloy ◽  
Electron Back Scattered Diffraction ◽  
Ybco Coated Conductors

Cube texture formation of Cu-33 at.%Ni alloy substartes and CeO2buffer layer prepared by chemical solution deposition on the textured substrate were investigated by electron back scattered diffraction (EBSD) and XRD technics systematically. The results shown that a strong cube textured Cu-33at.%Ni alloy substrate with the cube texture fraction of 99.8 % (< 10°) was obtained after annealing at 1000°C for 1 h. The full width half maximum (FWHM) values for the X-ray (111) phi-scan and (002) omega-scan in this substrate were 7.31° and 5.51°, respectively. Furthermore, the cube texture fraction of epitaxially grown CeO2buffer layer was 95 % (< 10°), and the FWHM values of phi-scan and omega-scan being 6.98° and 5.92°, respectively.

In Situ EBSD Study of Stable Cube Texture in an Advanced Composite Substrate Used in YBCO-Coated Conductors

2020 ◽  
Vol 26 (3) ◽  
pp. 365-372
Author(s):  
Yaotang Ji ◽  
Hongli Suo ◽  
ZiLi Zhang ◽  
Lin Ma ◽  
Jiazhi Li ◽  
...  
Keyword(s):  
Yield Strength ◽  
Cube Texture ◽  
Strain Curve ◽  
Coated Conductors ◽  
Buffer Layers ◽  
High Yield ◽  
Alloy Composite ◽  
Composite Substrates ◽  
Ybco Coated Conductors

AbstractAdvanced Ni8W/Ni12W/Ni8W alloy composite substrates used in YBCO-coated conductors with a strong cube texture and high yield strength have been fabricated, and a CeO2 buffer layer film was successfully deposited on the composite substrates. Through in situ tensile testing coupled with electron backscattered diffraction (EBSD) analysis, the stability of the cube texture of Ni8W/Ni12W/Ni8W alloy composite substrates has been investigated. The stress–strain curve shows that the yield strength (at 0.2% strain) of the composite substrates exceeds 250 Mpa. The orientation of grains and boundaries on the surface of the substrates was almost unchanged, while the strain exceeds 0.2%, which indicated that the composite substrates are adequate for depositing buffer layers and YBCO layers by the reel-to-reel process.

Investigation of Processing Variables of Ni Substrate for YBCO Coated Conductors

2005 ◽  
Vol 15 (2) ◽  
pp. 2679-2682 ◽  
Author(s):  
J.H. Lim ◽  
K.T. Kim ◽  
H.J. Kim ◽  
J. Joo ◽  
W. Nah ◽  
...  
Keyword(s):  
Coated Conductors ◽  
Ni Substrate ◽  
Processing Variables ◽  
Ybco Coated Conductors

Fabrication of Ni Sulfides by Thermal Sulfidation

2006 ◽  
Vol 510-511 ◽  
pp. 318-321
Author(s):  
Tae Hyun Nam ◽  
Cheol Am Yu ◽  
Dae Won Jung ◽  
Kwon Koo Cho
Keyword(s):  
Annealing Time ◽  
Annealing Temperature ◽  
Early Stage ◽  
Spherical Particles ◽  
Sulfur Pressure ◽  
X Ray ◽  
Ni Substrate ◽  
Initial Stage ◽  
Fabrication Parameters ◽  
Scanning Electron

The microstructure of Ni sulfides prepared by thermal sulfidation of pure Ni and their dependence of fabrication parameters were investigated by means of scanning electron microscopy and X-ray diffractions. Sulfidation was made by isothermally annealing Ni with the sulfur in vacuum sealed glass ampoules at 673 K for 120 – 600s under the sulfur pressure of 100 and 220 kPa. The sulfide layers formed in the early stage were found to consist of spherical particles smaller than 0.5um, which were grown and agglomerated with increasing annealing temperature. Thickness of sulfides developed on Ni substrate was found to increase with increasing annealing time and sulfur pressure. It was also found that compositions of dominant Ni sulfides changed with varying annealing time. At the initial stage, only Ni3S2 sulfide was formed on pure Ni, which was tightly bonded to Ni substrate. On increasing annealing time, NiS sulfide was formed. On further increasing annealing time, NiS1.97 sulfide was formed, which always coexisted with NiS sulfide. A mechanism for sulfidation of Ni is proposed as follows: 3Ni + 2S Ni3S2, Ni3S2 +S NiS, NiS + S NiS1.97

Powder metallurgy for the fabrication of bi-axially textured Ni tapes for YBCO coated conductors

2003 ◽  
Vol 386 ◽  
pp. 304-308 ◽  
Author(s):  
Dong-Wook Lee ◽  
Bong Ki Ji ◽  
Jun Hyung Lim ◽  
Choong-Hwan Jung ◽  
Jinho Joo ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Coated Conductors ◽  
Ybco Coated Conductors

Chemical synthesis of nanoparticles for artificial pinning centers in YBCO coated conductors

2005 ◽  
Vol 868 ◽  
Author(s):  
Srivatsan Sathyamurthy ◽  
Keith J. Leonard ◽  
M. Parans Paranthaman
Keyword(s):  
Coated Conductors ◽  
Ceria Nanoparticles ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
Pinning Centers ◽  
X Ray ◽  
Synthesis Of Nanoparticles ◽  
Artificial Pinning Centers ◽  
Transmission Electron ◽  
Ybco Coated Conductors

AbstractCeria nanoparticles were prepared using a solution based approach using cerium (III) acetate as a starting material and cetyltrimethylammonium hydroxide (CTAOH) as a precipitating agent and surfactant. The presence of the surfactant CTAOH helps prevent agglomeration of the nanoparticles. Using X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM), the particle size was determined to be 3.5 – 4 nm. The structure and properties of these CeO2 nanoparticles have been analyzed.

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