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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 9    No. 1    March 1999

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EFFECTS OF INTERSTITIAL IMPURITIES ON PHASE TRANSFORMATION OF Ti-Al ALLOYS①
Li Wen1  Chen Daimin1 Zhang Ruilin2

1.Department of Mechanical Engineering, Changchun University,Changchun 130022, P. R. China;
2.  Jilin University, Changchun 130023, P. R. China

Abstract:According to the Average Lattice and Atom Models of the Empirical Electron Theory of Solids and Molecules(EET), effects of interstitial impurities on valence electron structures and phase transformation of Ti-Al alloys are analyzed, and descendant degree of bond energy, melting point and liquidus temperatures affected by interstitial impurities are calculated by the bond energy formula of the EET, and then the main experimental results which are not confirmed about phase transformation in Ti-Al alloys are explained. The results are that, because of the effects of interstitial impurities, atom states increase, bond structures are seriously anisotropic,β→αtransformation is hindered, and the phase transformation in an intermediate content is very complex. Also, the melting point and liquidus temperatures decrease, and average decreased degree is estimated through approximation by the EET.

 

Key words: Ti-Al alloys phase transformation valence electron structure interstitial impurities

ISSN 1672-7029
CN 43-1423/U

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