A DIRECTIONAL COARSENING MECHANISM OF THE γ＇-PHASE DURING CREEP OF A SINGLE CRYSTAL NICKEL-BASE SUPERALLOY

Acta Metall Sin

1998, Vol. 34

Issue (6): 591-596 DOI:

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A DIRECTIONAL COARSENING MECHANISM OF THE γ＇-PHASE DURING CREEP OF A SINGLE CRYSTAL NICKEL-BASE SUPERALLOY

TIAN Sugui ; ZHOU Huihua ; ZHANG Jinghua; YANG Hongcai ; XU Yongbo;HU Zhuangqi ( State Key Laboratory for Fatigue and Fracture of Materials; Institute of Metal Research; The Chinese Academyof Sciences; Shenyang 110015)( Department of Materials Science and Engineering; Northeastern University ; Shenyang 110006)( Department of Materials Science and Engineering; Shenyang Polytechnic University; Shenyang 110023)Correspondent: TIAN Sugui; associate professor Tel: (024)5927399

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Abstract The microstructures of a [001] single crystal nickel--base superalloy at differentstages of the constant loading tensile creep were observed by means of TEM and SEM, and thechemical compositions of γ and γ＇ phases were analyzed by EDAX in order to investigate theprocess and mechanism of the directional coarsening of γ＇ phase. The results showed that themesh--like rafts were formed along the direction normal to the stress axis in a mode of side--planelink in primary creep. The applied stress resulted in the decrease of the coherent strain and theenergy of the γ＇/γ interfaces. Thus, the energy released was supposed to be the driving force forthe directional diffusion of elements, leading to the formation of the γ＇ rafts.

Key words: single crystal nickel-base superalloy creep directional coarsening diffusion driving force

Received: 18 June 1998

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1998/V34/I6/591

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