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Evaluations of low-temperature mechanical properties and full-range constitutive models of AA 5083-H112/6061-T6
https://orcid.org/0000-0002-2528-1350
https://orcid.org/0000-0002-7294-310X
https://orcid.org/0000-0002-7811-1232
Abstract The low-temperature mechanical properties of aluminium alloys (AAs) are important for the analysis and design of infrastructures in cold regions and LNG storage tanks made of AAs. This paper investigated the stress-strain behaviours of AA 5083-H112/6061-T6 materials through conducting tensile tests on 32 AA coupons at 20 ℃ ∼ −165 ℃. All the tested AA coupons exhibited ductile failure modes. Their results showed that the stress-strain curves of AA 5083-H112 exhibited the Portevin-Le Chatelier effects that gradually weakened with the decreasing temperature. Reducing the temperature from 20 ℃ to −165 ℃ increased the elastic modulus, yield and ultimate strengths of AA 5083-H112 (or 6061-T6) by 5.1% (6.5%), 8.7% (12.0%) and 7.8% (13.1%), but reduced the fracture strain by 16.4% (12.4%). The fracture surfaces of all AA 5083-H112 and 6061-T6 coupons displayed localised cross-sectional area reductions and substantial plastic deformation. Meanwhile, precipitation-hardened AA 6061-T6 exhibits a more pronounced enhancement compared to strain-hardened AA 5083-H112. Furthermore, regression analyses were performed to establish prediction equations for the low-temperature mechanical indexes of AAs. Subsequently, a full-range constitutive model was proposed to estimate the stress-strain behaviours of AA 5083-H112 and 6061-T6. Validations against reported experimental observations demonstrated that the developed model reasonably described the stress-strain responses of AA 5083-H112 and 6061-T6 from 20 ℃ to −165 ℃.
Highlights The yield/ultimate strength of AA increases as the T decreases from 20 to −165 ℃. The AA 5083-H112/6061-T6 coupons fail in ductile modes at low temperatures. The low temperatures do not compromise the ductility of AAs. Proposed models predict well the low-temperature σ-ε curves of AA 5083-H112 and 6061-T6.
Evaluations of low-temperature mechanical properties and full-range constitutive models of AA 5083-H112/6061-T6
https://orcid.org/0000-0002-2528-1350
https://orcid.org/0000-0002-7294-310X
https://orcid.org/0000-0002-7811-1232
Abstract The low-temperature mechanical properties of aluminium alloys (AAs) are important for the analysis and design of infrastructures in cold regions and LNG storage tanks made of AAs. This paper investigated the stress-strain behaviours of AA 5083-H112/6061-T6 materials through conducting tensile tests on 32 AA coupons at 20 ℃ ∼ −165 ℃. All the tested AA coupons exhibited ductile failure modes. Their results showed that the stress-strain curves of AA 5083-H112 exhibited the Portevin-Le Chatelier effects that gradually weakened with the decreasing temperature. Reducing the temperature from 20 ℃ to −165 ℃ increased the elastic modulus, yield and ultimate strengths of AA 5083-H112 (or 6061-T6) by 5.1% (6.5%), 8.7% (12.0%) and 7.8% (13.1%), but reduced the fracture strain by 16.4% (12.4%). The fracture surfaces of all AA 5083-H112 and 6061-T6 coupons displayed localised cross-sectional area reductions and substantial plastic deformation. Meanwhile, precipitation-hardened AA 6061-T6 exhibits a more pronounced enhancement compared to strain-hardened AA 5083-H112. Furthermore, regression analyses were performed to establish prediction equations for the low-temperature mechanical indexes of AAs. Subsequently, a full-range constitutive model was proposed to estimate the stress-strain behaviours of AA 5083-H112 and 6061-T6. Validations against reported experimental observations demonstrated that the developed model reasonably described the stress-strain responses of AA 5083-H112 and 6061-T6 from 20 ℃ to −165 ℃.
Highlights The yield/ultimate strength of AA increases as the T decreases from 20 to −165 ℃. The AA 5083-H112/6061-T6 coupons fail in ductile modes at low temperatures. The low temperatures do not compromise the ductility of AAs. Proposed models predict well the low-temperature σ-ε curves of AA 5083-H112 and 6061-T6.
Evaluations of low-temperature mechanical properties and full-range constitutive models of AA 5083-H112/6061-T6
https://orcid.org/0000-0002-2528-1350
https://orcid.org/0000-0002-7294-310X
https://orcid.org/0000-0002-7811-1232
Abstract The low-temperature mechanical properties of aluminium alloys (AAs) are important for the analysis and design of infrastructures in cold regions and LNG storage tanks made of AAs. This paper investigated the stress-strain behaviours of AA 5083-H112/6061-T6 materials through conducting tensile tests on 32 AA coupons at 20 ℃ ∼ −165 ℃. All the tested AA coupons exhibited ductile failure modes. Their results showed that the stress-strain curves of AA 5083-H112 exhibited the Portevin-Le Chatelier effects that gradually weakened with the decreasing temperature. Reducing the temperature from 20 ℃ to −165 ℃ increased the elastic modulus, yield and ultimate strengths of AA 5083-H112 (or 6061-T6) by 5.1% (6.5%), 8.7% (12.0%) and 7.8% (13.1%), but reduced the fracture strain by 16.4% (12.4%). The fracture surfaces of all AA 5083-H112 and 6061-T6 coupons displayed localised cross-sectional area reductions and substantial plastic deformation. Meanwhile, precipitation-hardened AA 6061-T6 exhibits a more pronounced enhancement compared to strain-hardened AA 5083-H112. Furthermore, regression analyses were performed to establish prediction equations for the low-temperature mechanical indexes of AAs. Subsequently, a full-range constitutive model was proposed to estimate the stress-strain behaviours of AA 5083-H112 and 6061-T6. Validations against reported experimental observations demonstrated that the developed model reasonably described the stress-strain responses of AA 5083-H112 and 6061-T6 from 20 ℃ to −165 ℃.
Highlights The yield/ultimate strength of AA increases as the T decreases from 20 to −165 ℃. The AA 5083-H112/6061-T6 coupons fail in ductile modes at low temperatures. The low temperatures do not compromise the ductility of AAs. Proposed models predict well the low-temperature σ-ε curves of AA 5083-H112 and 6061-T6.
Evaluations of low-temperature mechanical properties and full-range constitutive models of AA 5083-H112/6061-T6
Xi, Rong (author) / Xie, Jian (author) / Yan, Jia-Bao (author)
2023-12-07
Article (Journal)
Electronic Resource
English
AA , aluminium alloy , Cov , coefficient of variation , LN , liquid nitrogen , LNG , liquefied natural gas , TEM , transmission electron microscopy , HAADF , high-angle annular dark-field , PLC , Portevin-Le Chatelier , <italic>R</italic> <sup>2</sup> , correlation coefficient , R-O , Ramberg-Osgood , Aluminium alloys , Low temperatures , 5083-H112 and 6061-T6 , Tension tests , Mechanical properties , Full-range constitutive model
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