© Korean Powder Metallurgy Institute - 1249 - 1. Introduction In YBCO coated conductors (CC) process, multi-buffers and YBCO layer should be epitaxially deposited on substrate, thus, the formation of the substrate texture is critical to improve the critical current. Two different approaches were used to fabricate textured metal in terms of preparation of initial specimens, i.e., casting and powder metallurgy (P/M). The casting method is simpler and provides denser and larger ingots than the P/M method. Most of the published researches deal with the casting method rather than with P/M[1]. By contrast, the P/M method has the advantages of forming a high purity microstructure without columnar or dendrite structure and of ease in making alloys with uniformly distributed elements. While it is well known that the texture depend on the annealing temperature and total reduction ratio, the texture components and their variation in the Ni substrate prepared by the P/M method were not widely studied. In this work, we fabricated Ni substrates by P/M and casting methods. To characterize the effects of the two methods, the initial specimens were made of the same size and subjected to the same rolling conditions. Subsequently, the effects of annealing temperature and reduction ratio on the texture and grain morphology were evaluated. 2. Experimental and Results Ni substrates were fabricated by P/M and casting via plasma arc melting(PAM) methods. To evaluate the effects of the two methods, the initial specimens were of the same size and subjected to the same rolling conditions. In the P/M method, the Ni powder was loaded into a mold, and isostatic pressure of 200 MPa was applied to form a rod-type compact(13 mm diameter and 120 mm length). The compacts were sintered at 1100 for 6 h in an ℃ atmosphere of 96% Ar and 4% H 2 . For the casting method, 99.99% Ni chips were melted by plasma arc furnace in a reduced atmosphere of 1 x 10 -3 torr and then formed into a rod-type ingot(13 mm diameter and 120 mm length). The Ni rods were then cold-rolled into thin tape by a two-high rolling mill. Each rolling step reduced the thickness by less than 5%, and total reduction of 98.6% and 99.2% were incorporated to evaluate variation of texture with total reduction. Recrystallization annealing was performed at 600℃-1200 for 30 min. in an atmosphere of ℃ 96% Ar and 4% H 2 .. Microstructures were examined by optical microscopy. The texture of the substrate was measured by four incomplete pole figures. In order to evaluate the dependence of texture on the initial specimens and on the total reduction, a detailed analysis of ODFs of the rolled tapes was done. For the P/M-tape, the observed texture was mainly composed of Cu({112}<111>), Bs({110}<112>), and S({123}<634>) components. On the other hand, texture of the casting-tape consisted of Cu, Bs, S, and {013}<100> component as the major texture component and {110}<113>, {012}<121>, {012}<112>, and {001}<110> as minor one. The ODF of 2006 POWDER METALLURGY World Congress PC14-W-08 Texture Evolution in Ni Substrate Prepared by Powder Metallurgy and Casting Methods Jun Hyung Lim 1 , Kyu Tae Kim 1 , Eui Cheol Park 1 , Jinho Joo 1, a , Hyoungsub Kim 1 , Hoo-Jeong Lee 1 , Seung-Boo Jung 1 , and Wansoo Nah 2 1 School of Advanced Materials Science and Engineering, Sungkyunkwan University 300 Cheoncheon, Jangan, Suwon, Gyeonggi, Korea 2 School of Electrical and Computer Engineering, Sungkyunkwan University 300 Cheoncheon, Jangan, Suwon, Gyeonggi, Korea a jinho@skku.edu Abstract 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 evolution were evaluated. The initial specimens were rolled and then annealed in the temperature at 600℃ ~1200℃. A strong cube texture formed for P/M substrate, and the degree of texture did not significantly vary with annealing temperature of 600℃~1100℃. On the other hand, the texture of casting substrate was more dependent on the annealing temperature and twin texture and several minor texture components started to form at 1000℃. Keywords : Casting, Cube texture, powder metallurgy, substrate, YBCO