A Fundamental Investigation into the Joining of Advanced Light Materials
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 Nd:YAG 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 25, 1991
- Accession Number
- ADA244788
Entities
People
- L. Adler
- W. A. Baeslack Iii
Organizations
- Ohio State University