Influence of annealing on the microstructure of commercial Mg alloy AZ31 after mechanical forming

Jäger, Aleš; Lukáč, P.; Gärtnerová, V.; Haloda, J.; Dopita, Milan

doi:10.1016/j.msea.2006.06.070

Cited by 115 publications

(48 citation statements)

References 16 publications

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“…The main reason to understand this modification of the microstructure is that the particles are dissolved in the α-matrix. The same microstructures are shown by Jäger et al (2006), although the authors of this article did not indicate about the presence of precipitates, the microstructures of the "as fabricated" materials are the same that those obtained in this research, showing small spots spread inside the α-matrix which disappear after the annealing treatments. The same clean microstructures in the welding's heat-affected zones are obtained in this research, so that the relationship between thermal cycles/cooling rates and the presence of β-phase/Mn-Al can be stablished.…”

Section: Discussionsupporting

confidence: 78%

Study of the corrosion behavior of magnesium alloy weldings in NaCl solutions by gravimetric tests

Segarra¹,

Calderón²,

Portolés³

2015

REVMETAL

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ABSTRACT:In this article, the corrosion behavior of commercial AZ31 welded plates in aqueous chloride media was investigated by means of gravimetric techniques and Neutral Salt Spray tests (NSS). The AZ31 samples tested were welded using Gas Tugsten Arc Welding (GTAW) and different filler materials. Material microstructures were investigated by optical microscopy to stablish the influence of those microstructures in the corrosion behavior. Gravimetric and NSS tests indicate that the use of more noble filler alloys for the sample welding, preventing the reduction of aluminum content in weld beads, does not imply a better corrosion behavior. RESUMEN: Estudio del comportamiento frente a la corrosión de soldaduras de aleación de magnesio mediante técnicas gravimétricas.En este artículo se ha investigado el comportamiento frente a la corrosión en medios acuosos salinos de chapas soldadas de aleación AZ31 mediante técnicas gravimétricas y ensayo en cámara de niebla salina. Las muestras estudiadas han sido soldadas mediante soldadura TIG (Tungsten Inert Gas) y con diferentes materiales de aporte. En el estudio se ha empleado microscopía óptica para analizar la microestructura. Los ensayos de gravimetría y los ensayos de niebla salina indican que el empleo de materiales de aporte más nobles para soldar las muestras evitando la disminución del contenido en aluminio en los cordones, no implica un mejor comportamiento frente a la corrosión.

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Section: Discussionsupporting

confidence: 78%

Study of the corrosion behavior of magnesium alloy weldings in NaCl solutions by gravimetric tests

Segarra¹,

Calderón²,

Portolés³

2015

REVMETAL

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“…Besides, there is a non-homogeneous microstructure, showing different morphologies such as small and equiaxed grains, larger and in some cases elongated grains, and some precipitates were found. This microstructure is typical of magnesium alloy plastically deformed with partial annealing heat treatment [18].…”

Section: Microstructure Analysismentioning

confidence: 84%

Mechanical and microstructural behavior evolution of non-ferrous metals by ECASD

et al. 2017

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RESUMENEn este estudio, se usó la técnica de extrusión de láminas de una aleación de aluminio AA-1100-O y una aleación de magnesio AZ31-O por medio de un dado de cizalladura con un ángulo de 135 ° (ECASD, por sus siglas en inglés) para producir la deformación plástica en las aleaciones, que permita obtener microestructuras con tamaños de grano pequeños para aumentar su plasticidad en situaciones específicas de trabajo. En este estudio, se evaluó el cambio en las propiedades microestructurales y mecánicas por medio de microscopía óptica y ensayos mecánicos como microdureza y ensayos de tensión. La técnica de deformación plástica severa ECASD produce cambios en las propiedades mecánicas, sin cambios significativos en la masa de las muestras con pequeños cambios en las características micro-estructurales en el núcleo del material. Sin embargo, el proceso ECASD produce importantes cambios microestructurales cerca de la superficie de los materiales investigados, por tanto, la dureza está fuertemente modificada en esta región. Esto es debido a las altas tensiones de contacto y fricción desarrolladas con la matriz durante el proceso de ECASD.Palabras clave: Aleación de aluminio, aleación de magnesio, deformación por cizalladura, deformación plástica severa. ABSTRACTIn this study, Equal-Channel Angular Sheet Drawing-ECASD with a die set at 135° was used to produce plastic deformation onto an aluminum alloy AA-1100-O and a magnesium alloy AZ31-O samples, expecting a decreasing the grain size in order to increase the plasticity of these alloys under certain specific working conditions. In this study, the microstructural and mechanical properties changed due to this process were analyzed by optical microscopy and mechanical testing like micro-hardness and tension test. ECASD produces work hardening with no significant dimensional changes into the flat specimens with small changes in the microstructural characteristics. The ECASD process also produces important microstructural changes close to the surface of the investigated samples therefore its hardness is strongly modified in this region. This is due to the high contact stresses and friction developed with the die during the ECASD process.

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“…It is also noted that small but obvious increase in the frequency of high angle boundaries (HAGBs) between 80° and 90°. During annealing, high angle boundaries are preferred, because they are thermodynamically more stable 8,14 .…”

Section: Crystallographic Texturementioning

confidence: 99%

Microstructure and Mechanical Properties of Severely Deformed Mg-4.5Al-1.0Zn Alloy Processed by Asymmetric Rolling on Ingot and Twin Roll Cast Strip

Luo

Gong

et al. 2016

Mat. Res.

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Influence of annealing on the microstructure of commercial Mg alloy AZ31 after mechanical forming

Cited by 115 publications

References 16 publications

Study of the corrosion behavior of magnesium alloy weldings in NaCl solutions by gravimetric tests

Study of the corrosion behavior of magnesium alloy weldings in NaCl solutions by gravimetric tests

Mechanical and microstructural behavior evolution of non-ferrous metals by ECASD

Microstructure and Mechanical Properties of Severely Deformed Mg-4.5Al-1.0Zn Alloy Processed by Asymmetric Rolling on Ingot and Twin Roll Cast Strip

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