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Substitution behavior of Si in Al(3)Ti (D0(22)): a first-principles study
Guoliang Zhu1, Yongbing Dai, Da Shu
1The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China.
Abstract:
A first-principles total-energy plane-wave pseudopotential method based on density functional theory has been used to investigate the site preference of Si in Al(3)Ti. The site preference parameter S has been calculated and the value of S decreases on increasing Si concentration, but is always greater than 1 while the Si concentration is lower than 25 at.%, indicating Si has a strong site preference for the Al sublattice. The physical origin of the site preference of Si in Al(3)Ti was studied by calculating the densities of states (DOSs) of the Al(3)Ti-Si systems. The heat of formation and the DOS of the position of the Fermi energy level were also studied to analyze the site preference of Si in Al(3)Ti.
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