Accession Number:

ADA282970

Title:

Analysis of the Through-Thickness Micropore and Constituent Particle Population Gradients in the 7050-T7451 Plate Aluminum Alloys

Descriptive Note:

Progress rept.

Corporate Author:

CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS SCIENCE AND ENGINEERING

Report Date:

1994-03-01

Pagination or Media Count:

57.0

Abstract:

This report contains final results of the quantitative characterizations of the pore and constituent particle morphologies in two different variants of the 7050-T7451 six-inch-thick plate alloys. The purpose of those characterizations was to find volume fraction, size, shape and spatial distributions of both phases and their through-thickness gradients. This is the first ever characterization of this scope which provides unavailable until now data necessary for the predictions of the size distributions of the fatigue crack initiating flaws, and for the development and test of all microstructure based fatigue life prediction and durability models. The sizes, shapes, and orientations of both phases were analyzed using the linear intercept method. Their spatial distributions were quantified using the nearest neighbor spacings obtained via Voronoi Dirichlet tessellation techniques. Two types of intercept lengths, global and average, have been used to represent sizes of both phases on differently oriented test planes and at different locations within the plates. The distributions of those size measures for both features were lognormal.

Subject Categories:

  • Physical Chemistry
  • Properties of Metals and Alloys
  • Numerical Mathematics
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE