Comparison of Absorption and Desorption of Cryomill Process Control Agents and Their Effect on Compressive Behavior of Trimodal Aluminum Metal-Matrix-Composites

Abstract

Aluminum composite (AA5083) and boron carbide (B4C) powders were cryomilled in liquid nitrogen using different process control agents (PCAs) such as oleic acid, caprylic acid, and stearic acid individually in order to determine the effect of each PCA on the resultant microstructure and mechanical properties. The microstructure of the powders was examined and consolidated samples were mechanically tested in compression. Chemical analysis was performed to determine impurity concentrations of nitrogen, hydrogen, and oxygen. Microstructural analysis of the powders revealed three types of agglomerates: composite powders of AA5083 with uniformly distributed B4C particulate, unmilled spherical AA5083 powder and deformed AA5083 powder. These three types of agglomerates were found in similar size and proportion regardless of the PCA used. Correlation among PCA type, impurity concentrations, microstructure, and mechanical properties were examined.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 2014
Accession Number
ADA599311

Entities

People

  • Anit K. Giri
  • Clara Hofmeister
  • Kyu C. Cho
  • Sarah Brennan
  • Tim Delahanty
  • Yongho Sohn

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aluminum
  • Boron Carbides
  • Chemical Analysis
  • Chemistry
  • Composite Materials
  • Compressive Strength
  • Fatty Acids
  • Grain Size
  • Materials
  • Materials Processing
  • Materials Science
  • Materials Testing
  • Mechanical Properties
  • Metal Matrix Composites
  • Oleic Acid
  • Particles
  • Stearic Acid

Fields of Study

  • Materials science

Readers

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