Accession Number:

ADA244788

Title:

A Fundamental Investigation into the Joining of Advanced Light Materials

Descriptive Note:

Final rept. Apr 1988-Oct 1991

Corporate Author:

OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS

Personal Author(s):

Report Date:

1991-11-25

Pagination or Media Count:

290.0

Abstract:

Research performed during this program investigated the fundamental, materials science aspects of joining advanced light materials, emphasizing the similar and dissimilar alloy joining of state-of-the-art dispersion- strengthened, elevated-temperature aluminum alloys, weld solidification segregation effects on solid-state phase transformations in aluminum--copper and aluminum--copper--lithium type alloys, and the application of advanced ultrasonic NDE techniques to evaluate the characteristics and quality of solid- phase welds between light materials. The pulsed NdYAG laser welding process was shown to be highly effective in producing high-integrity fusion welds in a low- hydrogen content Al--8Iron--2Molybdenum alloy. Detailed analytical-electron microscopy analysis showed that the extremely high solidification and cooling rates experienced during this process promoted the formation of a microstructurally refined, high-strength fusion zone microstructure, and that minimal dispersoid coarsening occurred in the weld heat-affected zone HAZ. Transverse-weld oriented tensile joint efficiencies of essentially 100 were measured. Longitudinal-weld oriented bend testing showed excellent weld zone ductility with fracture occurring in the HAZ within the fusion zone of a previous pulse.

Subject Categories:

  • Properties of Metals and Alloys
  • Fabrication Metallurgy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE