Theoretical study of the thermodynamic properties of {alpha}-{delta}{prime} interphase boundaries in Al-Li
- Sandia National Labs., Livermore, CA (United States). Computational Materials Science Div.
The thermodynamic properties of coherent interphase-boundary interfaces between {alpha} and {delta}{prime} phases in the Al-Li alloy system have been studied using a theoretical approach based on the cluster variation method. Interfacial excess free energies have been calculated for interphase boundaries with {l_brace}100{r_brace} and {l_brace}111{r_brace} crystallographic orientations at several temperatures ranging between 100 and 209 C. Additionally, the dependencies of the average composition and the order parameter upon distance within the compositionally diffuse interfacial regions have been computed. The calculated interphase energies range between 7 and 11 mJ/m{sup 2}. From an analysis of the calculated composition and order-parameter profiles, interface widths are predicted to be as large as 27 {angstrom}.
- Research Organization:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 415405
- Journal Information:
- Acta Materialia, Vol. 44, Issue 10; Other Information: PBD: Oct 1996
- Country of Publication:
- United States
- Language:
- English
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