An Investigation of the As-Quenched and Early Aging Characteristics of a Al - 4.1wt.% Li Binary Alloy by X-Ray Diffraction

Abstract

The as-quenched and early aging characteristics of an as -cast binary, Al - 4.1 wt. % Li alloy has been studied by X-ray diffraction. Flat plate samples were solution heat treated at 540 C under argon and ice-brine quenched. Powder samples were made from flat plate samples in the as-quenched condition by filing at liquid nitrogen temperatures. Aging was conducted at 200 C on both plate and powder samples. The presence of very broadened 100 superlattice reflections of delta'Al3Li (Ll2 structure) and small reflections of delta Alli(B32 structure) were observed in the as-quenched condition for the plate sample. The powder sample showed the additional 110 superlattice peak of delta and 220delta peak. This clearly showed the preferred orientation effects of the plate. From as-quenched powder, a volume fraction of 77% with an average particle diameter of 53 angstroms was calculated.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1990
Accession Number
ADA237598

Entities

People

  • Scott J. Fuller

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms
  • Space

DTIC Thesaurus Topics

  • Air Force
  • Chemistry
  • Crystal Lattices
  • Crystal Structure
  • Diffraction
  • Electron Microscopy
  • Elements
  • Materials
  • Mechanical Engineering
  • Microscopy
  • Modulus Of Elasticity
  • Orientation (Direction)
  • Scattering
  • Solid Solutions
  • Spinodal Decomposition
  • X Rays
  • X-Ray Diffraction

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Metallurgy