Elastic behaviour of orientation-correlated grains in multiphase aggregates

Area of Science:

• Materials Science
• Solid Mechanics
• Crystallography

Background:

• Diffraction elastic constants (DEC) characterize the elastic response of orientation-correlated grain subsets.
• DEC are influenced by single crystal elastic behavior, preferred orientation, and grain-matrix interactions.

Purpose of the Study:

• To explore micro-mechanical models for calculating DEC and overall elastic constants.
• To investigate the use of electron backscatter diffraction (EBSD) data for DEC calculations.
• To detail the inverse problem of deriving single crystal elastic constants from DEC.

Main Methods:

• Utilized micro-mechanical models to calculate diffraction elastic constants (DEC).
• Incorporated discrete data from electron backscatter diffraction (EBSD) on grain shape, orientation, and neighbors.
• Developed methods for the inverse problem to determine single crystal elastic constants from DEC.

Main Results:

• Demonstrated that DEC are sensitive to grain shape, texture, and phase composition.
• Showcased the utility of EBSD data for precise DEC computations.
• Provided a detailed discussion on the inverse calculation of single crystal elastic constants.

Conclusions:

• DEC offer unique insights into material elastic properties influenced by microstructure.
• The study validates micro-mechanical models and EBSD data integration for materials analysis.
• The IsoDEC program is available for verifying all presented calculations.