A Lab-scale X-ray Diffraction Contrast Tomography System for Investigation of Crystallographic Effects on Stress Corrosion Cracking in High Performance Aluminum Alloys
Abstract
Funds are purchase a state-of-the art x-ray diffraction contrast tomography system to study the effects of crystallographic orientation and grain boundary misorientation on stress corrosion cracking and exfoliation corrosion.Currently, this kind of work can only be done at a synchrotron facility. The beamlines at synchrotrons for this kind of work are severely oversubscribed. In addition, getting long periods of time is difficult. Since corrosion studies can take weeks to months, thus a lab-scale solution for conducting these time dependent four dimensional (4D) experiments is necessary. The believe is that the proposed system and research work will provide a huge leap in the fundamental understanding of crystallographic effects on intergranular corrosion, as well as crack tip processes during combined corrosion and fatigue.Structural metallic materials are routinely subjected to mechanical stresses and strains in a variety of environments. Such materials possess complex microstructures spanning a wide spectrum of length scales, which determine their macroscopic properties and performance.Aluminum alloys are used in a variety of structural applications, such as aircraft wings, fuselage, etc. An examination of technological thrust areas important to the Navy, as put forth by theOffice of Naval Research, shows that aluminum alloys are excellent candidate materials as: (a) structural and propulsion materials, and (b) missile and spacecraft materials. These alloys are often subjected to stress in aggressive corrosive environments, e.g., salt water and moisture. Our ability to understand the fundamental physics of this problem relies on our ability to characterize and quantify material behaviors under a myriad of external stimuli. Thus, an intrinsic understanding and knowledge of complex microstructures and how they evolve under SCC conditions is extremely important.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 23, 2016
- Source ID
- N000141613007
Entities
People
- Nikhilesh Chawla
Organizations
- Arizona State University
- Office of Naval Research
- United States Navy