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Title: Microstructure and mechanical behavior of spray-deposited high-Li Al-Li alloys

Abstract

High-Li alloys, with the composition Al-3.8Li-XCu-1.0Mg-0.4Ge-0.2Zr, were synthesized using a spray deposition technique (wt. pct, X = 0 {approximately} 1.5). The microstructure of the spray-deposited Al-Li alloys consisted of equiaxed grains with an average grain size in the range from 20 to 50 {micro}m. The grain-boundary phases were fine and discrete. The spray-deposited and thermomechanically processed materials were isothermally heat treated at 150 C and 170 C to investigate the age-hardening kinetics. It was noted that the spray-deposited Al-3.8Li-XCu-1.0Mg-0.4Ge-0.2Zr alloys exhibited relatively sluggish aging behavior. The peak-aged condition was achieved at 170 C in the range from 20 to 90 hours. It was noted that Cu increases the hardness of alloys during aging. Moreover, the influence of Cu on age-hardening kinetics is marginal. The mechanical properties of the spray-deposited and extruded Al-Li alloys were studied in the underaged, peak-aged, and overaged conditions. For example, the peak-aged yield strength, tensile strength, and ductility of Al-3.8Li-1.0Cu-1.0Mg-0.4Ge-0.2Zr are 455 MPa, 601 MPa, and 3.1 pct, respectively. Moreover, an increase in the Cu content of the alloy led to improvements in strength, with only slight changes in ductility, for Cu contents up to 1.0 wt pct. Beyond this range, an increase in Cu contentmore » led to decreases in both strength and ductility.« less

Authors:
; ; ;  [1]
  1. Univ. of California, Irvine, CA (United States). Dept. of Chemical and Biochemical Engineering and Materials Science
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
363995
Resource Type:
Journal Article
Journal Name:
Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
Additional Journal Information:
Journal Volume: 30; Journal Issue: 5; Other Information: PBD: May 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MICROSTRUCTURE; MECHANICAL PROPERTIES; SPRAY COATING; ALUMINIUM ALLOYS; LITHIUM ALLOYS; COPPER ADDITIONS; CHEMICAL COMPOSITION; AGING; METALLURGICAL EFFECTS

Citation Formats

Del Castillo, L, Wu, Y, Hu, H M, and Lavernia, E J. Microstructure and mechanical behavior of spray-deposited high-Li Al-Li alloys. United States: N. p., 1999. Web. doi:10.1007/s11661-999-0286-3.
Del Castillo, L, Wu, Y, Hu, H M, & Lavernia, E J. Microstructure and mechanical behavior of spray-deposited high-Li Al-Li alloys. United States. https://doi.org/10.1007/s11661-999-0286-3
Del Castillo, L, Wu, Y, Hu, H M, and Lavernia, E J. 1999. "Microstructure and mechanical behavior of spray-deposited high-Li Al-Li alloys". United States. https://doi.org/10.1007/s11661-999-0286-3.
@article{osti_363995,
title = {Microstructure and mechanical behavior of spray-deposited high-Li Al-Li alloys},
author = {Del Castillo, L and Wu, Y and Hu, H M and Lavernia, E J},
abstractNote = {High-Li alloys, with the composition Al-3.8Li-XCu-1.0Mg-0.4Ge-0.2Zr, were synthesized using a spray deposition technique (wt. pct, X = 0 {approximately} 1.5). The microstructure of the spray-deposited Al-Li alloys consisted of equiaxed grains with an average grain size in the range from 20 to 50 {micro}m. The grain-boundary phases were fine and discrete. The spray-deposited and thermomechanically processed materials were isothermally heat treated at 150 C and 170 C to investigate the age-hardening kinetics. It was noted that the spray-deposited Al-3.8Li-XCu-1.0Mg-0.4Ge-0.2Zr alloys exhibited relatively sluggish aging behavior. The peak-aged condition was achieved at 170 C in the range from 20 to 90 hours. It was noted that Cu increases the hardness of alloys during aging. Moreover, the influence of Cu on age-hardening kinetics is marginal. The mechanical properties of the spray-deposited and extruded Al-Li alloys were studied in the underaged, peak-aged, and overaged conditions. For example, the peak-aged yield strength, tensile strength, and ductility of Al-3.8Li-1.0Cu-1.0Mg-0.4Ge-0.2Zr are 455 MPa, 601 MPa, and 3.1 pct, respectively. Moreover, an increase in the Cu content of the alloy led to improvements in strength, with only slight changes in ductility, for Cu contents up to 1.0 wt pct. Beyond this range, an increase in Cu content led to decreases in both strength and ductility.},
doi = {10.1007/s11661-999-0286-3},
url = {https://www.osti.gov/biblio/363995}, journal = {Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science},
number = 5,
volume = 30,
place = {United States},
year = {Sat May 01 00:00:00 EDT 1999},
month = {Sat May 01 00:00:00 EDT 1999}
}