Thermodynamic Descriptions of NI Alloys Containing AL, CR, and RU: A Computational Thermodynamic Approach Coupled with Experiments

Abstract

Abstract : Shortly after initiating this program, we focused our effort to develop thermodynamic descriptions of temary Ni-Cr-Ru and Ni-Al-Ru including the constituent binaries when needed using the traditional Calphad approach. In addition, we extended our effort to include the use of the Cluster/Site Approximation (CSA) to describe the fcc phases in the disordered and ordered states such as the prototype Cu-Ag-Au in 2003/2004 and then I in real ternary systems in 2004/2005. In the meantime, we began to explore the possibility of using CSA to calculate interphase boundary (IPB) energies of coherent interfaces such as those for I ` ii prototype Cu-Au binary and then real binaries such as Ni-Al. The preliminary results on CSA-calculated prototype Cu-Ag-Au diagrams and IPB energies on prototype Cu-Au and Ni-Al were presented at the 2004 annual review meeting at Wintergreen, VA We subsequently discussed with Dr. C. Hartley about our IPB energy effort and were encouraged to continue this research effort as part of our program.