EFFECTS OF SOLIDIFICATION VARIABLES ON INGOT STRUCTURE

Abstract

Results are summarized of experimental and analytical studies of solutionizing aluminum alloys containing a non-equilibrium second phase. Dendrite arm spacing, solution treatment temperature, and alloy content are the important processing variables determining time required to eliminate second phase. At a typical temperature used to solutionize 'premium quality' aluminum- 4.5 per cent copper alloy castings, required time for essentially complete elimination of second phase is 25 times the original solidification time. Experiments were conducted on dendritic and non-dendritic solidification of aluminum-copper alloys and of a magnesium-zinc alloy. Grain diameter in the non- dendritic melts was found to depend on solidification time in quantitatively the same way as dendrite arm spacing in the dendritic melts.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1966
Accession Number
AD0636547

Entities

People

  • H. D. Brody
  • Merton C. Flemings
  • T. F. Bower
  • T. Z. Kattamis

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Alloys
  • Aluminum Alloys
  • Cooling
  • Copper Alloys
  • Critical Temperature
  • Crystal Lattices
  • Dendritic Structure
  • Energy
  • Engineering
  • Experimental Data
  • Geometry
  • Grain Size
  • Heat Energy
  • Heat Of Fusion
  • Materials
  • Measurement
  • Solid Solutions

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.
  • Systems Analysis and Design

Technology Areas

  • Space