An empirical theoretical investigation into phase and structural behaviour in Ti–Al alloys

Authors: Cai, J. Y.¹; Peng, J. Z.²; Gray, M. F.³

Source: Materials Science and Technology, Volume 26, Number 5, May 2010 , pp. 534-538(5)

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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 analysed. Furthermore, the descendant degree of bond energy, melting point, and liquidus temperatures affected by interstitial impurities are calculated based on the bond energy formula of the EET. Moreover, the main controversial experimental results on the phase transformation in Ti–Al alloys are explained well. It is demonstrated that because of the effects of interstitial impurities, atom states increase, bond structures are seriously anisotropic, which results in very complex phase transformations in intermediate Al content. It is also shown that the melting point and liquidus temperatures decrease due to interstitial impurities, and the average decreased degree can be estimated very well using the EET.

Keywords: VALENCE ELECTRON STRUCTURE; TI-AL ALLOYS; INTERSTITIAL IMPURITIES; PHASE TRANSFORMATION

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174328408X396014

Affiliations: 1: Biological Science and Technology College, Changchun University, Changchun 130022, China 2: College of Physical Science and Information Engineering, Ji Shou University, Ji Shou, Hunan 416000, China 3: Materials science and engineering department, The Ohio State University, 650 Ackerman Road, Suite 255, Columbus, OH, 43202 USA

Publication date: 2010-05-01

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An empirical theoretical investigation into phase and structural behaviour in Ti–Al alloys

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