FORMATION OF BIMODEL DISTRIBUTION OF RE-RICH SECOND PHASE PARTICLES IN RAPIDLY SOLIDIFIED Ti-55 ALLOY

Acta Metall Sin

1995, Vol. 31

Issue (9): 417-421 DOI:

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FORMATION OF BIMODEL DISTRIBUTION OF RE-RICH SECOND PHASE PARTICLES IN RAPIDLY SOLIDIFIED Ti-55 ALLOY

LI Geping; (Institute of Metal Research; Chinese Academy of Sciences;Shenyang 110015) LI Dong; LIU Yuyin; HU Zhuangqi (Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015)

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LI Geping; (Institute of Metal Research; Chinese Academy of Sciences;Shenyang 110015) LI Dong; LIU Yuyin; HU Zhuangqi (Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015). FORMATION OF BIMODEL DISTRIBUTION OF RE-RICH SECOND PHASE PARTICLES IN RAPIDLY SOLIDIFIED Ti-55 ALLOY. Acta Metall Sin, 1995, 31(9): 417-421.

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Abstract The rapid-solidified Ti-5Al-4Sn-2Zr-1Mo-0.25Si-1Nd (Ti-55) high temperature alloy heat-treated 5h at 980℃ has been studied by TEM. The results show that the distribution of the RE-rich second phase particles is bimodel, the amount of the smaller particles (20─80 nm in diameter) is considerably larger than that of the large particles (200─300nm in diameter). Based on a diffusion－controlled growth kinetics equation, the formation mechanism of the bimodel distribution of the RE-rich second phase particles in the alloy is explained by using the disturbing theory.

Key words: rapid solidification Ti-55 alloy RE-rich second phase bimodel.

Received: 18 September 1995

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