Effect of hot rolling on the corrosion behavior of AZ31 magnesium alloy

Hanna, Abdelkader; Dakhouche, Achour; Tirsatine, Kamel; Sari, A.; Khereddine, Abdel Yazid; Bradai, Djamel; Azzeddine, Hiba

doi:10.1051/metal/2018041

Cited by 11 publications

(4 citation statements)

References 63 publications

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“…In this frame, the goal of this work is an investigation of the role of annealing temperature and duration on the static recrystallization/ grain growth kinetics of hot-rolled AZ31 alloy. First, the alloy was hot-rolled at 350°C to 70% of thickness reduction and then annealed at various temperatures (150°C, 250°C, and 350°C) from 5 min to 24 h. This work is a part of a series of investigations on the AZ31 alloy regarding the effect of rolling conditions and annealing treatments on corrosion behaviour [34,38]. So far, the results confirmed that small grain size combined with weak texture greatly enhanced the corrosion behavior of the AZ31 alloy [34,38].…”

Section: Introductionmentioning

confidence: 57%

“…First, the alloy was hot-rolled at 350°C to 70% of thickness reduction and then annealed at various temperatures (150°C, 250°C, and 350°C) from 5 min to 24 h. This work is a part of a series of investigations on the AZ31 alloy regarding the effect of rolling conditions and annealing treatments on corrosion behaviour [34,38]. So far, the results confirmed that small grain size combined with weak texture greatly enhanced the corrosion behavior of the AZ31 alloy [34,38]. It is believed that the present work will help to provide more data to ameliorate the design of AZ31 alloy.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of static recrystallization and grain growth kinetics of hot-rolled AZ31 alloy

et al. 2022

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The static recrystallization/grain growth kinetics of the AZ31 (Mg-3Al-1Zn, wt%) alloy were investigated employing Vickers microhardness and electron backscatter diffraction (EBSD) measurements. The AZ31 alloy was subject to a hot-rolling for 70% of thickness reduction and then annealed at various temperatures (150°C, 250°C, and 350°C) from 5 min to 24 h. First, the static recrystallization kinetics were analysed by means of the Johnson-Mehl-Avrami-Kolmogorov (JMAK) model. The results showed that the recrystallization occurred under two regimes both involving their own Avrami exponent/ activation energy. In regime I, the Avrami exponent was found in the range of 1.5-0.35 depending on the annealing temperature and activation energy of 74.1±5.7 kJ×mol-1. In regime II, an identical value of Avrami exponent was found (0.1-0.2) and a very low activation energy of 14.8±0.7 kJ×mol-1 was found for all annealing conditions. Non-random nucleation sites such as shear bands were considered as the main factor responsible for the deviation from the JMAK model. Moreover, the grain growth kinetics was well fitted by the general equation where . Accordingly, Qg = 109± 0.2 kJ×mol-1 which is median between grain boundary diffusion and bulk diffusion values for Mg and its alloys. The derived activation energies were discussed in terms of influencing factors such as solute drag, formation of basal texture, and microstructural heterogeneities like shear bands and twinning.

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Section: Introductionmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Evaluation of static recrystallization and grain growth kinetics of hot-rolled AZ31 alloy

et al. 2022

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“…In general, the grain refinement produced by SPD processing leads to a uniform corrosion due to the increase in grain boundary numbers which improves the corrosion properties of Mg-based alloys. In practice, in many cases it is found that improving the strength and formability of the Mg-RE alloys have a negative effect on the corrosion performance [15,[51][52][53]. The increase in dislocation density and the presence of twins appear to decrease the corrosion resistance of deformed Mg-based alloys [49].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Thermal Stability and Its Effect on the Corrosion Behaviour of Mg-RE Alloys Processed by High-Pressure Torsion

et al. 2023

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The evolutions of microstructure and texture and the corrosion behaviour of low light rare-earth containing Mg-1.4Nd and low heavy rare-earth containing Mg-0.6Gd and Mg-0.4Dy (wt.%) were evaluated and compared after processing by high-pressure torsion (HPT) and isochronal annealing at 250 and 450 °C for 1 h using electron backscatter diffraction (EBSD) and electrochemical tests in a 3.5% (wt.%) NaCl solution. The EBSD results show that dynamic recrystallisation (DRX) was restricted in the Mg-1.4Nd alloy which led to a heterogenous deformation microstructure whereas the Mg-0.6Gd and Mg-0.4Dy alloys exhibited a homogenous deformation microstructure formed mostly of equiaxed dynamically recrystallised DRX grains. The HPT processing caused the development of a deviated basal texture in the three alloys. A good thermal stability of the three alloys was noticed after annealing at 250 °C. By contrast, annealing at 450 °C led to a homogenous equiaxed microstructure and weakening of texture for the Mg-1.4Nd alloy and a heterogenous bimodal microstructure with a stable basal texture for the Mg-0.6Gd and Mg-0.4Dy alloys. The HPT-processed Mg–RE alloys exhibited an improved corrosion resistance due to grain refinement. Thereafter, the corrosion resistance of the Mg-0.6Gd and Mg-0.4Dy alloys decreased with increasing annealing temperature due to an increase in grain size while the corrosion resistance of the Mg-1.4Nd alloy was improved after annealing at 450 °C due to precipitation and texture weakening.

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“…Therefore, challenging analyses must be conducted to optimise the distribution of second phases to obtain uniform corrosion in Mgbased alloys. Thermo-mechanical processing and/or alloying elements have proven their effectiveness in modifying the microstructure by decreasing grain size as well as changing the distribution of second phases [7][8][9][10][11][12][13][14][15]. For example, high-pressure torsion (HPT) processing leads to uniform corrosion compared to localised corrosion, as occurs in as-cast pure Mg [9].…”

Section: Introductionmentioning

confidence: 99%

On the corrosion behaviour of as-cast and heat-treated Mg-RE alloys in 0.9% NaCl solution

Hanna¹,

Rabahi²,

Soualili³

et al. 2020

J Met Mater Miner

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The microstructure and corrosion behaviour of as-cast and heat-treated Mg-1.44Nd and Mg-1.43Ce (wt.%) alloys in 0.9% NaCl (wt.%) solution were investigated using electrochemical tests, X-ray diffraction (XRD) and scanning electron microscopy, combined with energy-dispersive X-ray spectroscopy (SEM-EDS). The as-cast microstructure of both alloys revealed the presence of second phases. Heat treatment at 535Â°C for 6 h led to a more uniform distribution of the second phases in Mg-1.44Nd alloy and their dissolution along the grains boundaries in the Mg-1.43Ce alloy. As a result, the corrosion resistance was improved in the heat-treated alloys. Accordingly, the corrosion resistance values for the heat-treated alloys were much higher than those of the as-cast alloys, indicating that the heat-treated alloys were less susceptible to the corrosion. Also, the heat-treated Mg-1.43Ce alloy seems to have very good corrosion resistance (26890 Î© cm2) compared to the Mg-1.44Nd alloy (6156 Î©Â·cm2) by preventing pitting corrosion along the grains boundaries. The corrosion product was made up mainly of magnesium hydroxide Mg(OH)2 and magnesium oxide MgO and more uniform corrosion morphology were found in the heat-treated alloys.

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Effect of hot rolling on the corrosion behavior of AZ31 magnesium alloy

Cited by 11 publications

References 63 publications

Evaluation of static recrystallization and grain growth kinetics of hot-rolled AZ31 alloy

Evaluation of static recrystallization and grain growth kinetics of hot-rolled AZ31 alloy

Evaluation of Thermal Stability and Its Effect on the Corrosion Behaviour of Mg-RE Alloys Processed by High-Pressure Torsion

On the corrosion behaviour of as-cast and heat-treated Mg-RE alloys in 0.9% NaCl solution

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