Evaluation of properties and microstructure of non-heat treatable Al-Mg-Li-C-O alloys with variable Li concentration

Fine grained Al-Mg-Li-C alloys, with lithium concentrations from 0.7 to 1.5 wt-%, have been produced by a mechanical alloying-powder metallurgy route. An initial range of compositions was chosen for manufacture into 10 kg billets which were uniaxially forged into plate; subsequently two compositions...

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Bibliographic Details
Published in:Materials science and technology 2001-06, Vol.17 (6), p.645-650
Main Authors: Vine, W.J., Pitcher, P.D., Tarrant, A.D.
Format: Article
Language:English
Subjects:
Applied sciences
Elasticity. Plasticity
Exact sciences and technology
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metal powders
Metals. Metallurgy
Powder metallurgy. Composite materials
Production techniques
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Summary:Fine grained Al-Mg-Li-C alloys, with lithium concentrations from 0.7 to 1.5 wt-%, have been produced by a mechanical alloying-powder metallurgy route. An initial range of compositions was chosen for manufacture into 10 kg billets which were uniaxially forged into plate; subsequently two compositions, alloy A (Al-3.7Mg-0.7Li-1.0C (wt-%) and alloy B (Al-4.4Mg-1.4Li-1.0C), were down-selected for a 20 kg scale-up exercise. Billets were forged at 300°C, using an 8:1 reduction ratio, which provided a sufficient level of work to develop properties, while avoiding excessive grain growth. Alloy B exhibited tensile properties (0.2% proof stress 450 MPa; ultimate tensile strength 510 MPa; strain to failure 6%) that exceeded the AECMA specification for AA 5091. Both alloys were confirmed as non-heat treatable and therefore exploitable in the as forged T1 condition. Microstructural analysis has confirmed that a fine grain size (
ISSN:0267-0836
1743-2847
DOI:10.1179/026708301101510500