Local deformation and processing maps of as-cast AZ31 alloy

Poletti, María Cecilia; Dieringa, Hajo; Warchomicka, Fernando

doi:10.1016/j.msea.2009.03.007

Cited by 36 publications

(10 citation statements)

References 29 publications

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“…This should be noted is reflective of uneven strain distribution as the deformation strains are more intense at the centre compared to the outer fringes (edges) of the samples. This behaviour is very much consistent with observations reported in literatura (Poletti et al, 2009;Fan et al, 2017). It is also noted that the SiC reinforced AMC had more significantly enlarged grains oriented along the deformation axis compared to that of the Cu-18Zn-7Al-0.3Ni reinforced AMCs.…”

Section: Microstructural Variation In Deformed Samplessupporting

confidence: 91%

Comportamiento del flujo de esfuerzo y análisis microestructural de compuestos de matriz de aluminio deformados en caliente y reforzados con partículas de la aleación con memoria de forma CuZnAlNi

et al. 2020

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Se investigó el comportamiento del flujo de esfuerzo por compresión y las microestructuras de los compuestos de matriz de aleación de Al deformada en caliente (AMC) y reforzados con partículas de la aleación con memoria de forma (SMA) basadas en CuZnAlNi. La aleación base Al-Mg-Si reforzada con 4, 6 y 8% en peso de Cu-18Zn-7Al-0,3Ni, y 8% en peso de partículas de SiC, se obtuvieron mediante agitación doble y se sometieron a pruebas de compresión en caliente a una velocidad de deformación de 1,0 s−1, temperatura de 400 °C, y ~60% de deformación global constante, para ello se utilizó un simulador termo-mecánico Gleeble 3500. Las microestructuras iniciales y deformadas de los compuestos se examinaron utilizando microscopía óptica. El uso de partículas Cu-18Zn-7Al-0,3Ni como refuerzo dio como resultado el desarrollo de una estructura de matriz más fina en comparación con el SiC. La tensión de flujo y la dureza de los AMC reforzados con partículas de Cu-18Zn-7Al-0,3Ni fueron generalmente más altos que los de la aleación de Al no reforzada y la aleación de Al reforzada con SiC. También la tensión de flujo y, en gran medida, la dureza creció con el aumento en el porcentaje en peso de partículas de Cu-18Zn-7Al-0,3Ni en el AMC. La mejora observada con el uso de partículas de la aleación Cu-18Zn-7Al-0,3Ni se atribuyó a la combinación del refuerzo mejorado y el refinamiento del tamaño grano de la matriz, fortalecimiento la interface, el esfuerzo residual de compresión, la alta conductividad térmica, y la capacidad de amortiguación ofrecida por la aleación Cu-18Zn-7Al-0,3Ni.

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Section: Microstructural Variation In Deformed Samplessupporting

confidence: 91%

Comportamiento del flujo de esfuerzo y análisis microestructural de compuestos de matriz de aluminio deformados en caliente y reforzados con partículas de la aleación con memoria de forma CuZnAlNi

et al. 2020

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“…Hence, information on dynamic recrystallization, recovery, superplasticity, failure (crack- The calculated activation energy can be initially classified in the range of dynamic recrystallization. This value varies within a range of 105 and 185 kJ•mol −1 [26][27][28][29][30][31][32]. Furthermore, the activation energy is above the self-diffusion of magnesium (135 kJ•mol −1 ) [33].…”

Section: Processing Mapmentioning

confidence: 96%

Microstructure and Hot Deformation Behaviour of Twin-Roll Cast AZ31 Magnesium Wire

et al. 2022

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Due to their low density and high specific strength, magnesium alloys offer great potential as a design material for lightweight construction. An economical and energy-efficient method for the production of magnesium wire is the technology of twin-roll casting. In this work, the deformation behaviour of twin-roll cast and heat-treated AZ31 wire pre-profile is investigated for the first time during the compression test at different temperatures (250–400 °C) and forming speeds (0.01–10 s−1). To obtain optimal parameters, a processing map is created, and the microstructural changes during the hot forming processes are determined by accompanying microstructure characterization through an optical microscope and scanning electron microscope. The heat treatment causes a reduction in segregation and a homogeneous microstructure. The average activating energy for plastic deformation of twin-roll cast and heat-treated magnesium alloy AZ31 is 159.008 kJ·mol−1. The instability region of the process map starts at a forming temperature of 250 °C and extends into the range of high forming speeds (1–10 s−1). In this area, cracks in the microstructure can be detected during hot forming. At high temperatures (300–350 °C), dynamic recrystallization at the grain boundaries is observed as the main forming mechanism. Based on these results and observations, existing models for describing the hot forming behaviour of magnesium alloys can be extended and validated.

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“…The interdependence of peak flow stress σ, strain rate . ε and deformation temperature T was described using semi-empirical equations, as done for Mg alloys by C. Poletti et al [34] and for steels by M. El Mehtedi et al [35]. The analysis of the flow stress at the peak value was carried out using the universal constitutive equation proposed by Sellars and Tegart [36]:…”

Section: Compression Testsmentioning

confidence: 99%

Hot Deformation Behavior of a Ni-Based Superalloy with Suppressed Precipitation

Lizzi

Pradeep

Stanojević

et al. 2021

Metals

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Inconel®718 is a well-known nickel-based super-alloy used for high-temperature applications after thermomechanical processes followed by heat treatments. This work describes the evolution of the microstructure and the stresses during hot deformation of a prototype alloy named IN718WP produced by powder metallurgy with similar chemical composition to the matrix of Inconel®718. Compression tests were performed by the thermomechanical simulator Gleeble®3800 in a temperature range from 900 to 1025 °C, and strain rates scaled from 0.001 to 10 s−1. Flow curves of IN718WP showed similar features to those of Inconel®718. The relative stress softening of the IN718WP was comparable to standard alloy Inconel®718 for the highest strain rates. Large stress softening at low strain rates may be related to two phenomena: the fast recrystallization rate, and the coarsening of micropores driven by diffusion. Dynamic recrystallization grade and grain size were quantified using metallography. The recrystallization grade increased as the strain rate decreased, although showed less dependency on the temperature. Dynamic recrystallization occurred after the formation of deformation bands at strain rates above 0.1 s−1 and after the formation of subgrains when deforming at low strain rates. Recrystallized grains had a large number of sigma 3 boundaries, and their percentage increased with strain rate and temperature. The calculated apparent activation energy and strain rate exponent value were similar to those found for Inconel®718 when deforming above the solvus temperature.

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Local deformation and processing maps of as-cast AZ31 alloy

Cited by 36 publications

References 29 publications

Comportamiento del flujo de esfuerzo y análisis microestructural de compuestos de matriz de aluminio deformados en caliente y reforzados con partículas de la aleación con memoria de forma CuZnAlNi

Comportamiento del flujo de esfuerzo y análisis microestructural de compuestos de matriz de aluminio deformados en caliente y reforzados con partículas de la aleación con memoria de forma CuZnAlNi

Microstructure and Hot Deformation Behaviour of Twin-Roll Cast AZ31 Magnesium Wire

Hot Deformation Behavior of a Ni-Based Superalloy with Suppressed Precipitation

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