Cryogenic tensile properties of AA 2090 weldments
The influence of base metal temper and filter metal additions on the cryogenic properties Al-Li 2090 weldments are studied. The results show that as the strength of the base metal increases, strength mismatch increases and the joint efficiency decreases. Inhomogeneous deformation is confined to the fusion zone and the strain localization results in premature failure in the weldment. As the temperature decreases, T3 base metal weldments show better properties than T8 base metal weldments. The influence of filler metal additions on the weldment properties shows that the strength is limited without post-weld aging, but the increase in elongation is significant. At 77 K, a 6 Cu addition to 2090 yields the best UTS and elongation combination of the filler metals studied. Mg addition leads to embrittlement at 77 K. 14 refs., 4 figs.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6003233
- Report Number(s):
- LBL-26651; CONF-8903109-4; ON: DE89012979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
COPPER ALLOYS
CRYOGENICS
EMBRITTLEMENT
JOINTS
LITHIUM ALLOYS
LOW TEMPERATURE
MAGNESIUM ALLOYS
MECHANICAL PROPERTIES
MEDIUM TEMPERATURE
METALLURGICAL EFFECTS
TEMPERATURE EFFECTS
TENSILE PROPERTIES
WELDED JOINTS
YIELD STRENGTH