Engineering topics

Amador, C.

Publications and source records attributed to Amador, C..

2 records

NASA NTRS1998

An Introduction to the BFS Method and Its Use to Model Binary NiAl Alloys

We introduce the Bozzolo-Ferrante-Smith (BFS) method for alloys as a computationally efficient tool for aiding in the process of alloy design. An intuitive description of the BFS method is provided, followed by a formal discussion of its implementation. The method is applied to the study of the defect structure of NiAl binary alloys. The groundwork is laid for a detailed progression to higher order NiAl-based alloys linking theoretical calculations and computer simulations based on the BFS method and experimental work validating each step of the alloy design process.

Bozzolo, Guillermo↗

NASA NTRS1992

'Wrong' bond interactions at inversion domain boundaries in GaAs

Electronic structure calculations of GaAs inversion-domain boundaries (IDBs) on different planes are reported. The resulting interface energies are analyzed in terms of the number of 'wrong' bonds (Ga-Ga and As-As) and their mutual compensation. The compensation energy varies roughly inversely proportionally to the distance between the wrong bonds. This favors local compensation in stoichiometric material. This automatically occurs for 110-plane planes or by chemical reconstruction for other planes. Ga-rich IDBs are predicted to have low energy in either Ga-rich or n-type material.

Lambrecht, W. R. L.↗