Effects of precipitate distribution on 293 K and 77 K properties of 2090-T81 weldments

Conference · Thu Jun 01 00:00:00 EDT 1989

OSTI ID:5576202

Sunwoo, A. J.; Miyasato, S.; Morris, Jr., J. W. ^[1]

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1. Lawrence Berkeley Lab., CA (USA)

Although 2090-T81 precipitation behavior has been well documented, the weld precipitation behavior has not been as-well characterized. The purpose of this study is to characterize the EB and GTA fusion zone precipitates and their distribution and to correlate the microstructure to 293 K and 77 K properties. The base metal strengths are greatly enhanced by a homogeneous distribution of T{sub 1} precipitates at 293 K and 77 K, but the presence of T{sub 1} and T{sub 2} at the boundaries has an adverse effect on the elongation at 77 K. The weld strengths are limited by a lack of strengthening precipitates. Fusion zone embrittlement is caused by the formation of Cu-Fe containing film and strain localization at the dendrite boundaries. 14 refs.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5576202
• Report Number(s): LBL-27380; CONF-890701--16; ON: DE90002332
• 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
COPPER ALLOYS
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
EMBRITTLEMENT
FRACTOGRAPHY
LITHIUM ALLOYS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
MICROSCOPY
MICROSTRUCTURE
PRECIPITATION
SEPARATION PROCESSES
TENSILE PROPERTIES
TRANSMISSION ELECTRON MICROSCOPY
WELDABILITY