Fundamental studies on the aluminum-lithium-Beryllium alloy system. Final report, February 1984-August 1986

Technical Report · Fri Aug 01 04:00:00 EDT 1986

OSTI ID:7142038

Wadsworth,; Nieh, T G; Vidoz, A E; Lewis, R E; Joshi, A

Recent developments in aluminum alloys for aerospace applications have emphasized low-density alloys and, in large part, this emphasis has been on Al-Li based alloys. The development of fine-structed Al-Li-Be alloys remains an interesting prospect for further decreasing the density and increasing the modulus of Al. The aging behavior of rapidly solidified Al-10%Be-3%Li ribbon was characterized. Several conclusions can be made from this study. The general aging characteristics of the ternary Al-Be-Li alloys are very similar to binary Al-Li alloys. Although delta-prime precipitates are present in the as-spun ribbon, uniform delta prime distribution was not observed until aging temperatures of about 180/sup 0/C. Heat treatment of the ribbon at higher temperatures, e.g., 300/sup 0/C resulted in delta-prime transformation. In the Al-Be-Li ternary, the alpha-Be particles are present in the Al-Li matrix as independent dispersoids and have little effect on the aging response of the Al-Li matrix. The size of the distribution of the alpha-Be particles is nonumiform. Upon heat treatment at temperatures higher than 300/sup 0/C, alpha-Be particles tend to coarsen and the growth behavior of these particles follows a classical Ostwald coarsening mechanism.

• Research Organization: Lockheed Missiles and Space Co., Inc., Palo Alto, CA (USA). Research and Development Div.
• OSTI ID: 7142038
• Report Number(s): AD-A-171624/0/XAB; LMSC-D-067295
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
BERYLLIUM ALLOYS
CASTINGS
CRYSTAL STRUCTURE
DENSITY
HEAT TREATMENTS
HIGH TEMPERATURE
LITHIUM ALLOYS
MICROSTRUCTURE
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PRECIPITATION
SEPARATION PROCESSES
SOLIDIFICATION
TRANSFORMATIONS