GROWTH MORPHOLOGY OF γ'-DENDRITE DURING HIGH TEMPERATURE AGEING OF Ni-BASE SUPERALLOY

Acta Metall Sin

1994, Vol. 30

Issue (12): 551-554 DOI:

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GROWTH MORPHOLOGY OF γ'-DENDRITE DURING HIGH TEMPERATURE AGEING OF Ni-BASE SUPERALLOY

YU Xihong;ZHANG Jinghua;HU Zhuangqi (Institute of Metal Research;Chinese Academy of Sciences; Shenyang)

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YU Xihong;ZHANG Jinghua;HU Zhuangqi (Institute of Metal Research;Chinese Academy of Sciences; Shenyang). GROWTH MORPHOLOGY OF γ'-DENDRITE DURING HIGH TEMPERATURE AGEING OF Ni-BASE SUPERALLOY. Acta Metall Sin, 1994, 30(12): 551-554.

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Abstract The morphology of γ' precipitate changed from cubic to flower like dendritic shape during high temperature ageing for a Rene'N4 single crystal Ni-base superalloy.The dendritic growth of γ' precipetate was of the selection area characteristic. The analysis results indicated that there was a critical growth size a* of γ' precipitate.As soon as the size of γ'was larger than the value of a * , the γ' precipitate would hollow and split by dismatch dislocation in order to match the increase of systematic energe of γ' and develop into dendrite.YU Xihong. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015

Key words: high temperature γ'-dendrite critical size dislocation matching.

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