Accession Number:

ADA589009

Title:

New Methodologies for Mathematical Representation and Computer Simulations of Microstructural Geometry: Applications to Light Alloys and Their Composites

Descriptive Note:

Final performance rept. 1 Apr 2005-30 Sep 2008

Corporate Author:

GEORGIA INST OF TECH ATLANTA SCHOOL OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s):

Report Date:

2009-01-29

Pagination or Media Count:

4.0

Abstract:

High-resolution large-volume segments of three-dimensional microstructures of a set of boron modified Ti-alloys containing TiB whiskers have been reconstructed and visualized using montage serial sectioning. These microstructures have been quantitatively characterized in detail using stereology and digital image analysis. A novel methodology has been developed for computer simulations of realistic two-dimensional 2D and three-dimensional 3D two-phase microstructures where the features have realistic complex shapesmorphologies, spatial clustering, morphological anisotropy, and global microstructural properties statistically similar to those in the corresponding real microstructures. The methodology was applied for simulations of realistic 2D and 3D microstructures of a set of discontinuously reinforced Al-alloy DRA composites containing SiC particles of complex shapes and different degrees of spatial clustering, and microstructures of a set of boron modified Ti-alloys having different degrees of morphological anisotropy of the TiB whiskers. Large windows of real and simulated 2D and 3D microstructures have been implemented as representative volume elements in the finite elements based frameworks to simulate the mechanical response.

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE