Microstructural influence on the work hardening of aluminum-lithium alloy 2090 at cryogenic temperatures

Conference · Sat Jun 01 04:00:00 EDT 1991

OSTI ID:5295776

Chu, D; Tseng, C T; Morris, Jr, J W ^[1]

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1. Lawrence Berkeley Lab., CA (United States) California Univ., Berkeley, CA (United States). Dept. of Materials Science and Engineering

Previous studies indicate that the work hardening characteristics of a Vintage III 2090-T81 12.7-mm (0.5-in.) plate is highly dependent on the through-thickness position. This dependency has been linked to two distinctly different microstructures existing as laminates within the plate. An investigation of the two microstructures by both optical and transmission electron microscopy reveal a difference in the distribution of grains and subgrains. It is believed that these factors affect the work hardening characteristics by governing the manner in which slip is transmitted from grain to grain. The findings are positive as they suggest a practical means by which improvements in work hardening can be obtained through modifications of the microstructure at the polygranular level. 24 refs., 7 figs.

• Research Organization: California Univ., Berkeley, CA (United States). Dept. of Materials Science and Engineering
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5295776
• Report Number(s): LBL-31075; CONF-910635--17; ON: DE92000903
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
GRAIN SIZE
HARDENING
LITHIUM ALLOYS
LOW TEMPERATURE
MECHANICAL PROPERTIES
MICROSCOPY
MICROSTRUCTURE
SIZE
TEMPERATURE EFFECTS