Theoretical study of the thermodynamic properties of αδ′ interphase boundaries in AlLi

✍ Scribed by M. Asta

• Book ID: 104403275
• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 438 KB
• Volume: 44
• Category: Article
• ISSN: 1359-6454
• DOI: 10.1016/s1359-6454(96)00030-4

✦ Synopsis

The thermodynamic properties of coherent interphase-boundary interfaces between ~ and fi' phases in the AI-Li alloy system have been studied using a theoretical approach based on the cluster variation method, lnterfacial excess free energies have been calculated for interphase boundaries with [100] and II111 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 interracial regions have been computed. The calculated interphase energies range between 7 and 11 m J/m-'. From an analysis of the calculated composition and order-parameter profiles, interface widths are predicted to be as large as 27 ,~.