Effect Of Phosphorus On Cast Microstructure Of Ni3Al

Acta Metall Sin

2004, Vol. 40

Issue (6): 613- DOI:

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Effect Of Phosphorus On Cast Microstructure Of Ni3Al

MENG Xiaona; SUN Wenru; GUO Shouren; LU Dezhong; LI Na

Institute of Metal Research; The Chinese Academy of Sciences; Shenyang 110016

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MENG Xiaona; SUN Wenru; GUO Shouren; LU Dezhong; LI Na. Effect Of Phosphorus On Cast Microstructure Of Ni3Al. Acta Metall Sin, 2004, 40(6): 613-.

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Abstract Phosphorus is hardly dissolved in the solidified Ni3Al solids,and tends to be segregated in the residual liquids of Ni3Al. The phosphorus--bearing phase is precipitated at the end of solidification. The segregation of phosphorus in the residual liquids inhibits the nucleation of Ni3Al grains and the formation of the equiaxed grains at the central part of the sample, and favors the growth of the columnar grains towards the central part of the sample. The reason for phosphorus to decrease the nucleation rate of Ni3Al is that it lowers the difference of free energy between solids and liquids, and increases the activation energy for the atoms to transit through the liquid/solid interface. Phosphorus lowers the final solidification temperature of Ni3Al, increases the length of mushy zone, inhibits the feeding of casting, and hence increases the tendency of micropores formation.

Key words: phosphorus solidification segregation

Received: 27 May 2003

ZTFLH:

TG113.1

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	MENG Xiaona
	SUN Wenru
	GUO Shouren
	LU Dezhong
	LI Na

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2004/V40/I6/613

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