Microstructure Analysis and Rheological Behavior of Magnesium Alloys at Semi-solid Temperature Range

Ślęzak, Marta; Bobrowski, Piotr; Rogal, Łukasz

doi:10.1007/s11665-018-3571-8

Cited by 7 publications

(3 citation statements)

References 43 publications

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“…For this reason, pure Mg and its alloys are vulnerable to corrosion in the highly conductive atmospheres like the aqueous solutions due to their electrochemical activity. The low weight and ecological friendliness of Mg alloys, on the other hand, make them an interesting structural material selection [4]. Even yet, their utilization is still limited via their deprived ductility and strength, which makes them less appropriate for numerous uses [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Annealing Treatment on (Mg17Al12) Phase Characterization and Corrosion Behavior in Different Solutions for AZ91 Alloy

Abass¹,

Abdulkareem²,

Hussein³

2023

Adv. Sci. Technol. Res. J.

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Heat treatment is the most suitable technique for altering the microstructure and, consequently, it is possible to create the optimal balance of corrosion resistance and mechanical strength in a material by carefully regulating the conditions during the heating process. The present work aims to investigate the effect of heat treatments (annealing) at 300 °C, at different times (10, 20, and 30 h) on the magnesium alloy. How the Mg 17 Al 12 phase influences the corrosion behavior of AZ91D magnesium alloy was quantified in different solution (SBF, Lactic and Ringer). It was able to construct an extensive range of Mg 17 Al 12 phase volume fractions by varying the annealing period. The corrosion potential of many specimens with varied proportions of the Mg 17 Al 12 phase was evaluated. The results of the conducted tests manifested that the material's resistance to corrosion greatly improved with an increase in the volume fraction of Mg 17 Al 12 phase. The effect of heat treatment on the microstructure was analyzed using transmission electron microscopy and X-ray diffraction. The SEM photographs evinced that the amount of β-Mg 17 Al 12 phase decreased significantly, with the distribution occurring at the grain boundaries and with increasing the time of annealing, resulting in a highly saturated α-grain. The XRD validated the all material peaks of phases that are present. The corrosion test behavior of AZ91 alloy in the simulated body fluid (SBF), lactic, and Ringer solutions was investigated through electrochemical measurements, the result was elucidated as measured along the Tafel slope, and the corrosion current density of all heat treated samples was lower than that of the as-cast sample. The measurement of hardness (HV) demonstrated that the hardness decreased to 64.5 HV0.5 during the heat treatment. The result antibacterial efficiency was revealed that AZ91 at 30 hr was best then as cast against the bacteria E.coli.

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Section: Introductionmentioning

confidence: 99%

Effect of Annealing Treatment on (Mg17Al12) Phase Characterization and Corrosion Behavior in Different Solutions for AZ91 Alloy

Abass¹,

Abdulkareem²,

Hussein³

2023

Adv. Sci. Technol. Res. J.

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“…At present, the subject of rheology of iron alloys has been mainly dealt with in relation to metal flow and the possibility of its formation in liquid states, in relation to the so-called thixoforming [13][14][15]. Often, these studies were accompanied by experiments conducted with light metals, mainly aluminum and magnesium [16][17][18][19][20][21][22]. The authors have previously conducted rheological studies in relation to both liquid and solid-liquid iron solutions, from the point of view of observing the flow of material used in various metallurgical processes [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Investigations of Liquid Steel Viscosity and Its Impact as the Initial Parameter on Modeling of the Steel Flow through the Tundish

Ślęzak

Warzecha

2020

Materials

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The paper presents research carried out to experimentally determine the dynamic viscosity of selected iron solutions. A high temperature rheometer with an air bearing was used for the tests, and ANSYS Fluent commercial software was used for numerical simulations. The experimental results obtained are, on average, lower by half than the values of the dynamic viscosity coefficient of liquid steel adopted during fluid flow modeling. Numerical simulations were carried out, taking into account the viscosity standard adopted for most numerical calculations and the average value of the obtained experimental dynamic viscosity of the analyzed iron solutions. Both qualitative and quantitative analysis showed differences in the flow structure of liquid steel in the tundish, in particular in the predicted values and the velocity profile distribution. However, these differences are not significant. In addition, the work analyzed two different rheological models—including one of our own—to describe the dynamic viscosity of liquid steel, so that in the future, the experimental stage could be replaced by calculating the value of the dynamic viscosity coefficient of liquid steel using one equation. The results obtained support the use of the author’s rheological model for the above; however, this model still needs to be refined and extended to a wide range of alloying elements, mainly the extension of the carbon range.

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“…The following magnesium alloys were examined (Table 1). For each of the aforesaid alloys (Table 1), the values of the liquidus temperatures and temperatures of the solid phase content of 20 % were determined with DSC analysis [24][25].…”

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confidence: 99%

Mathematical Description of Semi-Solid Magnesium Alloys Behaviour by Using Rheological Models

Ślęzak

2019

MSF

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This paper is a study of rheological analysis of magnesium alloys of groups Mg-Zn-Al and Mg-Zn-RE. It presents the results of high-temperature measurements of magnesium alloys, along with rheological analysis of their behaviour. Magnesium alloys are a very attractive material, due to their light weight and good plastic properties; on the other hand this material is very reactive in a liquid (semi-solid) state, which is challenging from a testing and forming perspective. The findings obtained were compared with five types of rheological models describing rheological characteristics of viscous systems. The analysis was carried out using Rheoplus software. As a result of the conducted work, the mathematical descriptions which are best for characterising rheological behaviour of semi-solid magnesium alloys containing 20% of the solid phase have been proposed.

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Microstructure Analysis and Rheological Behavior of Magnesium Alloys at Semi-solid Temperature Range

Cited by 7 publications

References 43 publications

Effect of Annealing Treatment on (Mg<sub>17</sub>Al<sub>12</sub>) Phase Characterization and Corrosion Behavior in Different Solutions for AZ91 Alloy

Effect of Annealing Treatment on (Mg<sub>17</sub>Al<sub>12</sub>) Phase Characterization and Corrosion Behavior in Different Solutions for AZ91 Alloy

Investigations of Liquid Steel Viscosity and Its Impact as the Initial Parameter on Modeling of the Steel Flow through the Tundish

Mathematical Description of Semi-Solid Magnesium Alloys Behaviour by Using Rheological Models

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