Accession Number:

ADA179289

Title:

High Energy High Rate Pulsed Power Processing of Materials by Powder Consolidation and by Railgun Deposition.

Descriptive Note:

Final technical rept. 10 Apr 85-10 Feb 87,

Corporate Author:

TEXAS UNIV AT AUSTIN CENTER FOR MATERIALS SCIENCE AND ENGINEERING

Personal Author(s):

Report Date:

1987-03-31

Pagination or Media Count:

127.0

Abstract:

This exploratory research program was initiated to investigate the potential of using pulse power sources for powder consolidation, deposition and other High Energy High Rate Processing. The characteristics of the High Energy High Rate 1MJs powder consolidation using megampere current pulses from a Homopolar Generator, have been defined. Molybdenum Alloy TZM, A Nickel based metallic glass, Copper graphite composites, and PM Aluminum Alloy X7091 have been investigated. The powder consolidation process produced high densification rates. Density values of 80 to 99 could be obtained with sub second high temperature exposure. Specific energy input and applied pressure were controlling process parameters. Time Temperature Transformation TTT concepts underpin a fundamental understanding of pulsed power processing. Inherent control of energy input, and time to peak processing temperature developed to be held to short times. Deposition experiments were conducted using an exploding foil device EFD providing an armature feed to railgun mounted in a vacuum chamber. The material to be deposited - in plasma, gas, liquid or solid state - was accelerated electromagnetically in the railgun and deposited on a substrate. Deposits of a wide variety of single specie and multi-specie materials were produced on several types of substrates. In a series of ancillary experiments, pulsed skin effect heating and self quenching of metallic conductors was discovered to be a new means of surface modification by High Energy High Rate Processing.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Laminates and Composite Materials
  • Properties of Metals and Alloys
  • Fabrication Metallurgy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE