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  • 1
    Online Resource
    Online Resource
    Hot Compression Behavior of New Al-6Mg and Al-8Mg Alloy with Improved Hot Workability Fabricated by Direct Chill Casting Method
    MDPI AG ; 2021
    In:  Metals Vol. 11, No. 2 ( 2021-02-07), p. 288-
    Details
    In: Metals, MDPI AG, Vol. 11, No. 2 ( 2021-02-07), p. 288-
    Abstract: A hot compression test of new Al-6Mg and Al-8Mg alloys was conducted to understand the dynamic recrystallization (DRX) behavior by Mg contents. To investigate the hot workability of Al-Mg with high Mg contents, the hot deformation behavior of Al-6Mg and Al-8Mg alloys was analyzed by a hot compression test in the temperature range of 300–450 °C, and the strain rate range of 10−3–100/s. Subsequently, high-temperature deformation behavior was investigated through the processing map and microstructure observation. In this study, the results have shown that, as the Mg contents increase, the maximum and yield strength increase while rapid flow softening after the peak strain has been observed due to accelerated dynamic recrystallization (DRX). Finally, the increase of Mg contents affects an increase of heat dissipation efficiency to be an indicator of regular deformation.
    Type of Medium: Online Resource
    ISSN: 2075-4701
    URL: Article
    DOI: 10.3390/met11020288
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2662252-X
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  • 2
    Online Resource
    Online Resource
    Stretch Forming Behavior and Constitutive Equation of a Modified 5083 Alloy with High Mg Content at Elevated Temperatures
    MDPI AG ; 2021
    In:  Metals Vol. 11, No. 3 ( 2021-03-03), p. 410-
    Details
    In: Metals, MDPI AG, Vol. 11, No. 3 ( 2021-03-03), p. 410-
    Abstract: For the purpose of applying a modified 5083 alloy (New 5083M alloy) with high Mg content in various automotive sheet parts, the stretch forming behavior of the 5083M alloy was studied in tensile mode at a wide range of processing conditions. The tensile tests were conducted by using a tensile test machine under the temperature ranges of 100–400 °C and the strain rate ranges of 0.001–1 s−1. The test results showed that the 5083M alloy has superior mechanical properties to that of the commercial 5083 alloy at elevated temperatures. The microstructure before and after the stretch forming was analyzed using optical microscope (OM) equipped with a polarizing filter and electron backscattered diffraction (EBSD) unit. Deformed microstructure was observed under low temperature conditions and dynamic recrystallized microstructure under high temperature conditions. However, regardless of microstructure evolution, developed deformation textures were distributed in orientation distribution functions (ODF) images. In addition, at high temperature and low strain rate condition, complex shaped cavities which were detrimental to mechanical properties appeared at the grain boundary and grain triple junction. Based on the test results data, a constitutive equation predicting the deformation behavior of the 5083M alloy was derived. The calculated curves by the constitutive equation were compared with the measured curves by experiment and agreed well.
    Type of Medium: Online Resource
    ISSN: 2075-4701
    URL: Article
    DOI: 10.3390/met11030410
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2662252-X
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  • 3
    Online Resource
    Online Resource
    Effect of Combined Extrusion and Rolling Parameters on Mechanical and Corrosion Properties of New High Strength Al-Mg Alloy
    MDPI AG ; 2021
    In:  Metals Vol. 11, No. 3 ( 2021-03-08), p. 445-
    Details
    In: Metals, MDPI AG, Vol. 11, No. 3 ( 2021-03-08), p. 445-
    Abstract: High strength Al-Mg alloy is an attractive material that has the characteristic of increasing both strength and elongation by adding more solute Mg. However, there is a limitation in the oxidation issue during the casting process when it contains high amounts of solute Mg. New Al-Mg alloy was developed using Mg+Al2Ca master alloy by making a stable CaO/MgO mixed layer that no significant oxidation occurred. Here, the intergranular corrosion (IGC), electrochemical, and mechanical properties of new Al-Mg alloys fabricated through a combined process of extrusion and cold rolling were studied after the specimens went through artificial aging heat treatment at 200 °C. The results show that the grain size and the volume fraction of anodic β-precipitation (Mg2Al3) forming on the grain boundary influence the intergranular corrosion results. Corrosion potential and current density were achieved by potentiodynamic polarization electrochemical test. The results show that corrosion potential remains irrespective of the manufacturing process, while current density increases with artificial aging treatment. Both hardness and tensile mechanical properties decrease on cold rolled specimens after the heat treatment, while increase in extrusion and annealed specimens.
    Type of Medium: Online Resource
    ISSN: 2075-4701
    URL: Article
    DOI: 10.3390/met11030445
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
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  • 4
    Online Resource
    Online Resource
    Intergranular Corrosion and Microstructural Evolution in a Newly Designed Al-6Mg Alloy
    MDPI AG ; 2021
    In:  Materials Vol. 14, No. 12 ( 2021-06-15), p. 3314-
    Details
    In: Materials, MDPI AG, Vol. 14, No. 12 ( 2021-06-15), p. 3314-
    Abstract: In this work, the microstructure and corrosion behavior of a novel Al-6Mg alloy were investigated. The alloy was prepared by casting from pure Al and Mg+Al2Ca master alloy. The ingots were homogenized at 420 °C for 8 h, hot-extruded and cold-rolled with 20% reduction (CR20 alloy) and 50% reduction (CR50 alloy). The CR50 alloy exhibited a higher value of intergranular misorientation due to a higher cold rolling reduction ratio. The average grain sizes were 19 ± 7 μm and 17 ± 9 μm for the CR20 and CR50 alloys, respectively. An intergranular corrosion (IGC) behavior was investigated after sensitization by a nitric acid mass-loss test (ASTM G67). The mass losses of both the CR20 and CR50 alloys were similar at early periods of sensitization, however, the CR20 alloy became more susceptible to IGC as the sensitization time increased. Grain size and β phase precipitation were two critical factors influencing the IGC behavior of this alloy system.
    Type of Medium: Online Resource
    ISSN: 1996-1944
    URL: Article
    DOI: 10.3390/ma14123314
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2487261-1
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  • 5
    Online Resource
    Online Resource
    Investigation of Oxidation Behaviors of Al-Mg Alloys with a Grain Refiner at High Temperature
    American Scientific Publishers ; 2021
    In:  Journal of Nanoelectronics and Optoelectronics Vol. 16, No. 7 ( 2021-07-01), p. 1129-1133
    Details
    In: Journal of Nanoelectronics and Optoelectronics, American Scientific Publishers, Vol. 16, No. 7 ( 2021-07-01), p. 1129-1133
    Abstract: Studies to investigate the oxidation behavior of Al–Mg alloys with Al-5 mass%Ti-1 mass%B master alloy as a grain refiner at high temperature were conducted. The Scheil-Gulliver cooling calculation showed that, in 0.2 mass%Ti-inoculated alloy, TiAl 3 was formed before the primary Al formation, which may act as a grain refiner. The optical microstructures showed a significant grain refinement after the addition of 0.2 mass%Ti using Al-5 mass%Ti-1 mass%B master alloy. Moreover, the oxidized cross-sections, throughout the oxidation time, show coarse and dark areas (regarded as oxide clusters), which were nonuniformly distributed in the matrix after oxidation at 500 °C under an ambient atmosphere. In addition, an accumulation of oxygen by diffusion for a long duration led to the growth of blisters after 50 h. At the oxidation temperature, Mg 3 Ti 2 Al 18 was found to be only stable Ti-containing phase and possibly formed MgO by the interaction with the diffused oxygen.
    Type of Medium: Online Resource
    ISSN: 1555-130X
    URL: Article
    DOI: 10.1166/jno.2021.3020
    Language: English
    Publisher: American Scientific Publishers
    Publication Date: 2021
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  • 6
    Online Resource
    Online Resource
    Effect of Mg on the Oxide Growth of Al–Cu Alloys at Elevated Temperature
    American Scientific Publishers ; 2021
    In:  Journal of Nanoelectronics and Optoelectronics Vol. 16, No. 8 ( 2021-08-01), p. 1243-1247
    Details
    In: Journal of Nanoelectronics and Optoelectronics, American Scientific Publishers, Vol. 16, No. 8 ( 2021-08-01), p. 1243-1247
    Abstract: In this study, we investigated the effect of Mg on oxide growth of Al-Cu alloys at elevated temperatures. Results show that Al 2 Cu as eutectic phase was distributed in the as-cast microstructure of Mg-free Al-5 mass%Cu alloy, whereas Al 2 CuMg_S phase was formed by eutectic reactions with the addition of Mg. Scanning electron microscopy and thermodynamic calculations revealed that after oxidation at 500 °C for 30 h, Al-5 mass%Cu alloy had only slightly oxidized surfaces, whereas significantly grown oxide clusters formed as the Mg content increased. MgO and spinel were the main oxides in the Mg-containing alloys, whereas no Cu-based oxide was involved in the oxidation of the alloys. Only Al 2 CuMg_S phase contributed to the oxidation of the base metal and the formation of Mg-based oxides. The Al-5 mass%Cu alloy showed no inter-products with Mg-based oxides, including Mg O and spinel.
    Type of Medium: Online Resource
    ISSN: 1555-130X
    URL: Article
    DOI: 10.1166/jno.2021.3022
    Language: English
    Publisher: American Scientific Publishers
    Publication Date: 2021
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  • 7
    Online Resource
    Online Resource
    Effect of Compositional Variation on the Microstructural Evolution and the Castability of Al–Mg–Si Ternary Alloys
    Springer Science and Business Media LLC ; 2021
    In:  Metallurgical and Materials Transactions A Vol. 52, No. 8 ( 2021-08), p. 3353-3365
    Details
    In: Metallurgical and Materials Transactions A, Springer Science and Business Media LLC, Vol. 52, No. 8 ( 2021-08), p. 3353-3365
    Type of Medium: Online Resource
    ISSN: 1073-5623 , 1543-1940
    URL: Article
    DOI: 10.1007/s11661-021-06306-5
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2021
    detail.hit.zdb_id: 1179415-X
    detail.hit.zdb_id: 2037517-7
    detail.hit.zdb_id: 192156-3
    SSG: 19,1
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  • 8
    Online Resource
    Online Resource
    Investigating the Influence of Mg Content Variations on Microstructures, Heat-Treatment, and Mechanical Properties of Al-Cu-Mg Alloys
    MDPI AG ; 2023
    In:  Materials Vol. 16, No. 12 ( 2023-06-14), p. 4384-
    Details
    In: Materials, MDPI AG, Vol. 16, No. 12 ( 2023-06-14), p. 4384-
    Abstract: The objective of this study was to examine the impact of varying magnesium levels in the α-Al + S + T region of the Al-Cu-Mg ternary phase diagram on the solidification process, microstructure development, tensile properties, and precipitation hardening of Al-Cu-Mg-Ti alloys. The outcomes indicate that alloys with 3% and 5% Mg solidified with the formation of binary eutectic α-Al-Al2CuMg (S) phases, whereas in the alloy with 7% Mg, the solidification process ended with the formation of eutectic α-Al-Mg32(Al, Cu)49 (T) phases. Additionally, a significant number of T precipitates were noticed inside the granular α-Al grains in all alloys. In the as-cast condition, the 5% Mg-added alloy showed the best combination of yield strength (153 MPa) and elongation (2.5%). Upon T6 heat treatment, both tensile strength and elongation increased. The 7% Mg-added alloy had the best results, with a yield strength of 193 MPa and an elongation of 3.4%. DSC analysis revealed that the increased tensile strength observed after the aging treatment was associated with the formation of solute clusters and S″/S′ phases.
    Type of Medium: Online Resource
    ISSN: 1996-1944
    URL: Article
    DOI: 10.3390/ma16124384
    Language: English
    Publisher: MDPI AG
    Publication Date: 2023
    detail.hit.zdb_id: 2487261-1
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  • 9
    Online Resource
    Online Resource
    Effects of Constituent Phases on Oxidation Kinetics of Al–Mg Alloys Containing a Trace of Ca
    American Scientific Publishers ; 2021
    In:  Journal of Nanoscience and Nanotechnology Vol. 21, No. 3 ( 2021-03-01), p. 2067-2070
    Details
    In: Journal of Nanoscience and Nanotechnology, American Scientific Publishers, Vol. 21, No. 3 ( 2021-03-01), p. 2067-2070
    Abstract: In this study, the effects of constituent phases on the oxidation kinetics of an Al-7 mass%Mg alloy containing a trace of Ca were investigated. A Mg+Al 2 Ca master alloy was used to add Mg and Ca simultaneously. Scheil-Gulliver cooling by thermodynamic calculation showed that the addition of Ca led to the formation of Ca-based intermetallic compounds, such as Al 4 Ca and Laves C36, after solidification. Based on weight increase indicated by the oxidation test and surface analysis, it was found that the presence of Ca-based phases significantly improved the oxidation resistance and slowed down the oxidation rates. Based on the review of phase diagrams with oxygen partial pressure by thermodynamic calculation, it was thought that in the initial oxidation, MgO and MgAl 2 O 4 were formed on the surfaces of the Al–Mg alloys, leading to further oxidation. The Ca-based intermetallic compounds formed Ca–Mg–Al based oxides, which possibly contributed to the formation of a relatively dense oxide layer.
    Type of Medium: Online Resource
    ISSN: 1533-4880
    URL: Article
    DOI: 10.1166/jnn.2021.18945
    Language: English
    Publisher: American Scientific Publishers
    Publication Date: 2021
    SSG: 11
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  • 10
    Online Resource
    Online Resource
    Oxidation Kinetics of Cu Alloys Containing Alkaline Earth Metals at Low Temperature
    American Scientific Publishers ; 2021
    In:  Journal of Nanoscience and Nanotechnology Vol. 21, No. 3 ( 2021-03-01), p. 2071-2074
    Details
    In: Journal of Nanoscience and Nanotechnology, American Scientific Publishers, Vol. 21, No. 3 ( 2021-03-01), p. 2071-2074
    Abstract: In this study, the oxidation behavior of Cu alloys containing two alkaline earth metals (i.e., Mg and Ca) at 500 °C was investigated. The Mg+Mg 2 Ca master alloy was used for the simultaneous addition of Mg and Ca into Cu. As a result of the oxidation test, all examined samples showed weight gains that followed parabolic laws. Mg addition in Cu considerably slowed down the oxidation rate, while the use of the Mg+Mg 2 Ca master alloy as an alloying element for Mg led to an even further reduction in the oxidation rates at the testing temperature. The phase diagrams with the oxygen partial pressure showed that the Ca and Mg-containing alloy resulted in the formation of CaO as the primary oxide and MgO as the secondary oxide. The improved oxidation resistance can be attributed to the mixed surface layer of CaO and MgO, which control the growth rate of Cu 2 O.
    Type of Medium: Online Resource
    ISSN: 1533-4880
    URL: Article
    DOI: 10.1166/jnn.2021.18947
    Language: English
    Publisher: American Scientific Publishers
    Publication Date: 2021
    SSG: 11
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