Grain Size Control in AA5083 by Thermomechanical Processing (TMP): The Role of Dispersed Particles

Abstract

Superplasiticity in Aluminum alloys allows for the economical forming of components of complex shapes while retaining the high-strength and stiffness-to-weight ratios characteristic of alloys used in automotive, aerospace and military applications. Superplastic materials require fine grains with high-angle boundaries having resistance to failure by cavitation. This study was designed to achieve improved control of microstructure of Continuously Cast (CC) AA 5083 utilizing the Particle Stimulated Nucleation (PSN) model as a guide. The studies included a variety of overaging parameters in the thermomechanical process (TMP), followed by a constant processing strain and a subsequent recrystallization annealing treatment. The resulting material was analyzed using optical microscopy, and backscatter electron (BSE) and orientation imaging microscopy (OIM) methods to evaluate the effect of the processing on the grain size and the dispersion of particles.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 2003
Accession Number
ADA434673

Entities

People

  • Ramiro E. Orellano Jr

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Creep
  • Crystal Structure
  • Dispersions
  • Geometry
  • Grain Size
  • Grinding Wheels
  • Heat Treatment
  • High Angles
  • Manufacturing
  • Materials
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Microscopy
  • Phase Diagrams
  • Silicon Carbide
  • Statistical Analysis

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.

Technology Areas

  • Microelectronics
  • Space