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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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
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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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description 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 (
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source SAGE:Jisc Collections:SAGE Journals Read and Publish 2023-2024:2025 extension (reading list)
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
title Evaluation of properties and microstructure of non-heat treatable Al-Mg-Li-C-O alloys with variable Li concentration
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