Microscopic Study of the Influence of Impurities on Interface Bonding.
Abstract
Research on the behavior of model laminate systems led to several results. In an attempt to evaluate the interface cohesive models, EXAFS was used to probe the interfaces. The advantages of the EXAFS as a probe for these investigations was the use of the beam polarization to probe the directionality to the bonding, the in-situ nature of directly probing the nature of the interface and the ability of localizing the impurities at the interface avoiding the masking of the results with background matrix signal. Samples of layered structures of Nickel Titanium-Ni, Cobolt-Ti-Co, Aluminum Gallium-Al, Al-arsenic-Al and the layered structures with hydrogen added to the interfaces were prepared. Experiments were performed at the Cornell CHESS and the Brookhaven National Laboratory light sources. The ability to get meaningful EXAFS data for multilayered specimen with partial monolayers of impurities was established. The ability of the EXAFS to distinguish between Ti metal, Ti oxide and Ti in TiNi in the interface layers was determined using standards for references.The directional behavior of the bonding within and normal to the interface was indicated for the Al-As-Al layered structures. The measurements of hydrogen at the interface were inconclusive. Keywords: Auger Electron Spectroscopy, Interface Characteristics, Interface Fracture, Scanning Auger Microscopy, Mn-N Stainless Steels, Intergranular Fracture, Pitting, Passivation, Fracture Model, Layered Structures Titanium alloys, Aluminum Alloys.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 30, 1987
- Accession Number
- ADA178510
Entities
People
- Harris L. Marcus
Organizations
- University of Texas at Austin