Time-resolved small-angle x-ray scattering study of the coarsening kinetics of. delta. prime precipitation in Al-Li binary alloys containing 8 and 9 at% Li

Journal Article · Mon Jul 01 04:00:00 EDT 1991 · Scripta Metallurgica; (United States)

OSTI ID:5237591

Lee, H Y ^[1]; Hsu, S S ^[2]; Chen, H ^[3]

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1. User Div., Synchrotron Radiation Research Center, Hsinchu (TW)
2. Dept. of Nuclear Engineering, National Tsing Hua Univ., Hsinchu (TW)
3. Illinois Univ., Urbana, IL (United States). Dept. of Materials Science and Engineering

Recently, Al-Li based alloys have attracted strong interest especially in the aerospace industry and other applications where weight reduction is important. The Al-Li alloy system shows age hardening, resulting from precipitation of metastable {delta}{prime} (Al{sub 3}Li) particles which have an ordered Li{sub 2} structure (Cu{sub 3}Au type). The {delta}{prime} phase produces a small lattice mismatch with the solution matrix; strain effects are thereby minimized. As a result, {Delta}{prime} precipitates remain coherent with the matrix phase and are of spherical shape even when their sizes reach several hundreds of nm. The present paper is a continuation of a previous investigation which concentrated on Al-Li alloys containing 5.2, 7, and 12 at% Li. Therefore, the current results may be combined with the previous ones to provide an integral view of the {delta}{prime} coarsening behavior in Al-Li binary system.

• OSTI ID: 5237591
• Journal Information: Scripta Metallurgica; (United States), Journal Name: Scripta Metallurgica; (United States) Vol. 25:7; ISSN 0036-9748; ISSN SCRMB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360105 -- Metals & Alloys-- Corrosion & Erosion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400101 -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
AGE HARDENING
ALLOY SYSTEMS
ALLOYS
ALUMINIUM ALLOYS
BINARY ALLOY SYSTEMS
CHEMICAL REACTION KINETICS
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
EXCITED STATES
HARDENING
IONIZING RADIATIONS
KINETICS
LATTICE PARAMETERS
LITHIUM ALLOYS
METASTABLE STATES
PHASE STUDIES
RADIATIONS
REACTION KINETICS
SCATTERING
SMALL ANGLE SCATTERING
X RADIATION