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Acta Metall Sin  1998, Vol. 34 Issue (12): 1261-1266    DOI:
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DIRECTIONAL COARSENING OF THE γ'-PHASE DURING COMPRESSION CREEP OF A SINGLE CRVSTAL NICKEL-BASE SUPERALLOY
(TIAN Sugui ; ZHOU Huihua; ZHANG Jinghua;YANG Hongcai;XU YOngboHU Zhuangqi(State Key Laboratory for Fatigue and Fracture of Materials; Institute of Metal ReSearch; The Chinese Academyof Sciences; Shenyang 110015)(Department of Materials Sciences and Engineering; Northeastern University; Shenyang 110006)(Department of Metal Materials Engineering; Shenyang Polytechnic University 110023)Correspondent:TIAN Sugui; associate professor; Tel: (o24)-25927399; Fax: (024)e3891s2oManuscript received 1997-12-23; in revised form 1998-03-16
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(TIAN Sugui ; ZHOU Huihua; ZHANG Jinghua;YANG Hongcai;XU YOngboHU Zhuangqi(State Key Laboratory for Fatigue and Fracture of Materials; Institute of Metal ReSearch; The Chinese Academyof Sciences; Shenyang 110015)(Department of Materials Sciences and Engineering; Northeastern University; Shenyang 110006)(Department of Metal Materials Engineering; Shenyang Polytechnic University 110023)Correspondent:TIAN Sugui; associate professor; Tel: (o24)-25927399; Fax: (024)e3891s2oManuscript received 1997-12-23; in revised form 1998-03-16. DIRECTIONAL COARSENING OF THE γ'-PHASE DURING COMPRESSION CREEP OF A SINGLE CRVSTAL NICKEL-BASE SUPERALLOY. Acta Metall Sin, 1998, 34(12): 1261-1266.

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Abstract  The microstructures of a single crystal nickel-base superalloy with [001] orientation at different creep stages of the constant loading compression were observed by meansof TEM and SEM. The results showed that the strip--like rafts were formed along the directionparallel to the stress axis in a mode of the side plane link in primary creep. The applied stressresulted in the decrease of coherent strain and energy of the 7i/7 interfaces parallel to the stressaxis The energy released was supposed to be the driving force for the diffusion elements. Bycompared compressive creep with tensile, the longer time and bigger stress were needed for ther' rafted.
Key words:  single crystal nickel-base superalloy      compression creep      directional coarsening      driving force     
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https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1998/V34/I12/1261

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