Investigation of recrystallization kinetics in hot-rolled Mg-La alloy using differential scanning calorimetry technique

Bourezg, Yousf Islem; Elfiad, Djazia; Azzeddine, Hiba; Bradai, Djamel

doi:10.1016/j.tca.2020.178688

Cited by 11 publications

(6 citation statements)

References 41 publications

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“…For example, the Avrami exponent was found in the range of 0.27-3.4 for AZ31 alloy under different deformation and annealing conditions [9,18,19,21,[26][27][28]51]. Moreover, a lower n range (0.6-0.9) was also reported in processed and annealed Mg-RE alloys [12,51]. Two major reasons were anticipated to explain the low n values [33].…”

Section: Static Recrystallization Kineticsmentioning

confidence: 89%

“…Many experimental studies on various metals reported the deviation of Avrami exponent from the theoretical values [9,12,18,19,21,[26][27][28][51][52][53][54]. For example, the Avrami exponent was found in the range of 0.27-3.4 for AZ31 alloy under different deformation and annealing conditions [9,18,19,21,[26][27][28]51]. Moreover, a lower n range (0.6-0.9) was also reported in processed and annealed Mg-RE alloys [12,51].…”

Section: Static Recrystallization Kineticsmentioning

confidence: 97%

“…Globally, the n values obtained from the present investigation are lower than the ideal values (Table 1), except for the sample annealed at the lowest temperature of 150°C. Many experimental studies on various metals reported the deviation of Avrami exponent from the theoretical values [9,12,18,19,21,[26][27][28][51][52][53][54]. For example, the Avrami exponent was found in the range of 0.27-3.4 for AZ31 alloy under different deformation and annealing conditions [9,18,19,21,[26][27][28]51].…”

Section: Static Recrystallization Kineticsmentioning

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: Static Recrystallization Kineticsmentioning

confidence: 89%

Section: Static Recrystallization Kineticsmentioning

confidence: 97%

Section: Static Recrystallization Kineticsmentioning

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 dynamic recovery of AA5083 with a high stacking fault energy is apparent. In this process, the climbing of edge dislocations and the cross slipping of the screw dislocation significantly offset the dislocation, leading to decrease of dislocation density [35]. The extended dislocation width of the AA5083 is so narrow that the cross-slipping and climbing are easy to occur, allowing the dislocation to escape from the node or dislocation network and offset other dislocations.…”

Section: Mechanical Properties Of Aa5083/heaps Mmcs Effected By Heapsmentioning

confidence: 99%

Enhanced Mechanical Properties of AA5083 Matrix Composite via Introducing Al0.5CoCrFeNi Particles and Cryorolling

Luo

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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High-entropy alloy particles (HEAPs) can markedly enhance the mechanical properties of metal matrix composites (MMCs). In this study, AA5083/Al 0.5 CoCrFeNi HEAPs MMCs with different HEAPs contents (0, 1, and 3 wt%) were prepared via a stir-casting, and then these MMCs sheets were hot rolled (573 K) and cryorolled (77 K), respectively. The mechanical properties of the MMCs sheets were measured by tensile testing and microhardness test. Additionally, their microstructures were analyzed by scanning electron microscopy and transmission electron microscopy. Results revealed that the ultimate tensile strength (UTS) of the as-cast AA5083/Al 0.5 CoCrFeNi HEAPs MMCs were improved from 203 to 257 MPa by adding 3 wt% HEAPs. And the mechanical properties of the MMCs sheets were improved after cryorolling. After cryorolling with 50% rolling reduction ratio, the MMCs with 1 wt% HEAPs had an UTS of 382 MPa, which was 1.9 times that of the MMCs before rolling. Finally, the strengthening mechanisms of HEAPs and cryorolling on the AA5083/HEAPs MMCs were discussed.

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“…Regarding the influence of the holding time and soaking temperature on the amount of austenite formed during CAP, the commercial software JMatPro ® [17] was employed. The model of JMatPro ® for simulating the reaustenitisation of steels is based on the modified Johnson-Mehl-Avrami equation [18]. The thermodynamic calculation was performed using, as input data, the chemical composition of the 50% cold-rolled steel in Table 1, the heating rate of 10°C/s, and the microstructural condition set as normalised.…”

Section: % Cold-rolled Samples After Capmentioning

confidence: 99%

Recrystallisation kinetics and yield-strength adjustment after annealing of cold-rolled microalloyed steel

Leão

Medeiros

Saraiva

et al. 2022

Materials Science and Technology

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After continuous annealing process (CAP) at 790°C, 85% of the coils of 50% cold-rolled low carbon microalloyed (LCM) steel did not exhibit yield-strength (YS) on the target range, while the 70% cold-reduced LCM coils did. In this context, the non-isothermal recrystallisation kinetics of ferrite for the above two full-hard LCM steel were investigated using differential scanning calorimetry and the Friedman differential isoconversional method. The recrystallisation kinetics of ferrite for the two deformed states showed different behaviour. Regarding a fixed degree of cold-rolling deformation, the soaking temperature was found as the manageable parameter to control YS during CAP. Consequently, a suitable YS of the 50% cold-rolled LCM steel was achieved by setting the soaking temperature at 773°C.

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Investigation of recrystallization kinetics in hot-rolled Mg-La alloy using differential scanning calorimetry technique

Cited by 11 publications

References 41 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

Enhanced Mechanical Properties of AA5083 Matrix Composite via Introducing Al0.5CoCrFeNi Particles and Cryorolling

Recrystallisation kinetics and yield-strength adjustment after annealing of cold-rolled microalloyed steel

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