Acta Metall Sin  2006, Vol. 42 Issue (9): 942-946     DOI:

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EFFECT OF DC ELECTRIC CURRENT ON THE PRECIPITATION OF γ '-PHASE IN A Ni-BASED SINGLE CRYSTAL SUPERALLOY

LI Yingju; YANG Yuansheng; FENG Xiaohui; ZHANG Yunan; HU Zhuangqi

中国科学院金属研究所

LI Yingju; YANG Yuansheng; FENG Xiaohui; ZHANG Yunan; HU Zhuangqi. EFFECT OF DC ELECTRIC CURRENT ON THE PRECIPITATION OF γ '-PHASE IN A Ni-BASED SINGLE CRYSTAL SUPERALLOY. Acta Metall Sin, 2006, 42(9): 942-946 .

Abstract References Related Articles Recommended Metrics Download:  PDF(538KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The effects of DC electric current on the precipitation of γ '-phase in a Ni-based single crystal superalloy were studied. Under the action of different current densities the superalloy was cooled at different cooling rates after solution heat treatment at 1250 ℃ for 4 h. The experiment results show that the size and volume fraction of γ '-phase increase with the increase of current density, while the planar density of γ '-phase decreases at air cooling; under the action of the same current density, the size and volume fraction of γ '-phase decrease and the planar density of γ '-phase increases with the increase of cooling rate. It is considered that the electromigration effect induced by the DC current accelerates the diffusion of atoms during γ '-phase precipitation, which enhances the precipitation of γ '-phase, and the Joule heat effect produced by the DC current reduces the cooling rate, which speeds up the growth of γ '-phase. Key words:  Ni-based single crystal superalloy      γ '-phase precipitation      DC electric current       Received:  28 February 2006      ZTFLH:  TG132.3   Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors LI Yingju YANG Yuansheng FENG Xiaohui ZHANG Yunan HU Zhuangqi URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2006/V42/I9/942 [1]Caron P,Khan T.Aerosp Sci Technol,1999;3:513 [2]Higginbotham G J S.Mater Sci Technol,1986;2:442 [3]Nembach E,Schanzer S,Schroer W,Trinckauf K.Acta Metall,1987;35:1471 [4]Monajati H,Jahazi M,Bahrami R,Yue S.Mater Sci Eng,2004;A373:286 [5]Ahmed S,Bond R,McKannan E C.Adv Mater Processes,1991;140:30 [6]Ahmed S,McKannan E C.Mater Sci Technol,1994;10:941 [7]Yang Y S,Zhang Q S,Hu Z Q.In:Morris D G,Naka S,Caron P,eds.,Interraetallics and Superalloys,EUROMAT 99,Vol.10,Weinheim Germany:Wiley-vch,1999:34 [8]Yang Y S,Li W F,Wang Z Z,Hu Z Q.In:Hanada S,Zhong Z,Nam S W,Wright R N,eds.,4th Pacific Rim Int Conf on Advanced Materials and Processing,Vol.1,Tokyo:The Japan Institute of Metals,2001:345 [9]Pellissier G E,Purdy S M.ASTM STP 122,1972 [10]Kearseya R M,Beddoesa J C,Jonesb P,Au P.Intermetallics,2004;12:903 [11]Conrad H.Mater Sci Eng,2000;A287:227 [12]David U F.Scr Mater,1999;40;1215 [13]Bhowal P R,Wright E F,Raymond E L.Metall Trans,1990;21A;1709a [1] ZHAO Peng, XIE Guang, DUAN Huichao, ZHANG Jian, DU Kui. 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