The relative stress-corrosion-cracking susceptibility of candidate aluminum-lithium alloys for aerospace structural applications

Author:: Pizzo, P. P.
Published:: Sep 1, 1980.
Physical Description:: 1 electronic document

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Summary:

The microstructure and tensile properties of two powder metallurgy processed aluminum-lithium alloys were determined. Strength properties of 480 MPa yield and 550 MPa ultimate tensile strength with 5% strain to fracture were attained. Very little reduction in area was observed and fracture characteristics were brittle. The magnesium bearing alloy exhibited the highest strength and ductility, but fracture was intergranular. Recrystallization and grain growth, as well as coarse grain boundary precipitation, occurred in Alloy 2. The fracture morphology of the two alloys differed. Alloy 1 fractured along a plane of maximum shear stress, while Alloy 2 fractured along a plane of maximum tensile stress. It is found that a fixed orientation relationship exists between the shear fracture plane and the rolling direction which suggests that the PM alloys are strongly textured.

Other Subject(s):

METALLIC MATERIALS

Collection:

NASA Technical Reports Server (NTRS) Collection.

Note:

Document ID: 19820017493.
Accession ID: 82N25369.
NASA-CR-166339.
TR-45-1.
NAS 1.26:166339.

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