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

作者：Cai, J Y; Peng, J Z; Gray, M F^*

来源：Materials Science and Technology, 2010, 26(5): 534-538.

DOI：10.1179/174328408X396014

• Ti-Al alloys
• Phase transformation
• Valence electron structure
• Interstitial impurities

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.

• 出版日期2010-5
• 单位长春大学; 吉首大学