Anisotropy of elastic properties in various aluminium-lithium sheet alloys

Journal Article · Wed May 01 04:00:00 EDT 1996 · Acta Materialia

DOI:https://doi.org/10.1016/1359-6454(95)00320-7· OSTI ID:247939

Zeng, X H; Ericsson, T ^[1]

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1. Linkoeping Univ. (Sweden)

Anisotropic elastic properties of recrystallized and unrecrystallized Al-Li sheets have been experimentally studied and compared with theoretically predicted results. A conventional AA2024 alloy in the annealed condition as a reference material has also been investigated. A concept of lithium equivalent has been proposed in order to calculate single crystal elastic constants C{sub 11}, C{sub 12} and C{sub 44} for commercial Al sheet alloys. Subsequently, these calculated single crystal elastic constants were applied to predict the Young`s modulus, using Bunge`s method with quantitative texture data which were determined by X-ray and neutron diffraction techniques. To calculate the shear modulus the Bunge`s method was extended. It is shown that elastic properties of the alloys can be essentially predicted on the basis of Bunge`s method with calculated single crystals C{sub ij}. The measurement results of the Young`s modulus and shear modulus of polycrystalline Al-Li alloys were carried out using a dynamic resonance method. They were found to be in fair agreement with calculated curves using the neutron texture data with the calculated single crystal elastic constants C{sub ij}. The results showed that elastic properties depend strongly on testing direction due to the crystallographic texture and grain shape. The texture gradients also strongly affected the elastic properties of Al-Li alloys, but only slightly affected those of the conventional 2024 Al alloy. A slight stretch reduces the modulus of Al-Li by a small amount.

• Sponsoring Organization: USDOE
• OSTI ID: 247939
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 5 Vol. 44; ISSN XZ504Y; ISSN 1359-6454
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CORRELATIONS
ELASTICITY
LITHIUM ALLOYS
MONOCRYSTALS
NEUTRON DIFFRACTION
POLYCRYSTALS
PREDICTION EQUATIONS
RECRYSTALLIZATION
SHAPE
TEXTURE
X-RAY DIFFRACTION
YOUNG MODULUS