Solution and ageing heat treatments of ZK60 magnesium alloys with rare earth additions produced by semi-solid casting

Silva, Erenilton Pereira da; Batista, Larissa Fernandes; Callegari, Bruna; Buzolin, Ricardo Henrique; Warchomicka, Fernando; Requena, Guillermo; Brito, Pedro; Pinto, Haroldo Cavalcanti

doi:10.1590/1516-1439.266214

Cited by 14 publications

(5 citation statements)

References 24 publications

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“…The alloys were then artificially aged in an air circulated muffle furnace (KANTHAL, Sandvik Group, Sweden) at 180 ± 1 • C [16,17] up to 96 h in the interval of 24 h followed by air cooling. Vickers micro hardness tests were carried out to investigate the aging behavior of the alloys.…”

Section: Methodsmentioning

confidence: 99%

“…Also, it can be noted that the standard deviation in Mg-4Al-4Nd alloy is the maximum which suggests the inhomogeneous distribution of phases in the microstructure. Figure 7 represents the Vickers micro hardness of Mg-4Al, Mg-4Al-1Nd and Mg-4Al-4Nd alloys isothermally aged at 180 °C up to 96 h [16,17]. It is interesting to note that the hardness of all of the alloys reaches peak value after 24 h of aging.…”

Section: Hardnessmentioning

confidence: 99%

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Effect of Heat Treatment on the Microstructure of Mg-4Al-Nd Alloys

2017

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Abstract:In the present work, Mg-4Al-xNd (x = 0, 1, 4 wt.%) alloys were prepared by a stir casting method, and the effect of the addition of Neodymium (Nd) as-cast and of heat-treated microstructures was studied. The addition of 1 wt.% Nd preferentially formed the Al 2 Nd phase and completely suppressed the formation of the intermetallic Mg 17 Al 12 (γ) phase, which was initially present in the base alloy (Mg-4Al alloys). On increasing the Nd percentage from 1 to 4 wt.% in the base alloy, two intermetallic phases, Al 2 Nd and Al 11 Nd 3, were observed in the microstructure, as higher levels of Nd led to a peritectic reaction between Al and the Al 2 Nd phase, and part of the Al 2 Nd transformed into the Al 11 Nd 3 phase. The hardness of the as-cast alloy increased with the Nd content. Thus, the hardness increased from 57.1 ± 4.1 Hv of Mg-4Al to 66.5 ± 2.6 Hv of Mg-4Al-4Nd. It was also found that solutionizing and isothermal aging of alloys containing Nd at 180 • C for 96 h led to the size reduction of Al-and Nd-containing intermetallics without altering their morphologies. Further, it was found that Nd does not have any effect on the aging kinetics of the alloys because all of the alloys with and without Nd attained peak hardness at 24 h of aging time.

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Section: Methodsmentioning

confidence: 99%

Section: Hardnessmentioning

confidence: 99%

Effect of Heat Treatment on the Microstructure of Mg-4Al-Nd Alloys

2017

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“…Furthermore, investigation of tensile anisotropy by equal channel angular pressing (ECAP) without solution treatment increased the yield strength (YS) to 220MPa in the transverse direction (TD) and significant refinement had occurred after a single pass by ECAP technique through dynamic recrystallization (DRX) [10,11]. Silva et al [12], investigate the effect of the rare earth element in ZK60 plus T4, T5 and T6 heat treatment. The result obtained was at 1.5% of the rare earth element and further T6 heat treatment increase the hardness up to 85HV [12].…”

Section: Introductionmentioning

confidence: 99%

“…Silva et al [12], investigate the effect of the rare earth element in ZK60 plus T4, T5 and T6 heat treatment. The result obtained was at 1.5% of the rare earth element and further T6 heat treatment increase the hardness up to 85HV [12]. Vesling et al [13], investigate the effect of heat treatment on the superplasticity of AZ91, AE42, ZRE1, and QE22 magnesium alloy.…”

Section: Introductionmentioning

confidence: 99%

Effect of semi-solid forming temperature and heat treatment on mechanical properties and microstructure of Mg-Al-Zn Alloy (AZ91D) for automotive light application

Kamal

Bazilah

Idris

et al. 2020

JMES

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Magnesium alloy usage in manufacturing engineering components resulting in weight reduction and as a consequence, reduction in fuel and energy consumption. Magnesium has a relatively low density and roughly 30% lighter than aluminum. However, magnesium is considered to be difficult to deform because of the HCP structure. In this present work, the effect of semi-solid forming temperature and heat treatment on mechanical properties of Mg-Al-Zn were investigated. Mg-Al-Zn ingot was machined into a billet and formed with three different temperatures and underwent T4 heat-treatment process. To determine the mechanical properties and microstructure of the magnesium alloy, tensile and hardness test were performed and the result indicates that the highest average maximum tensile stress was achieved at 209 MPa at 530ºC after forming with T4 heat treatment and highest hardness value was at 21.44 HRB at 560ºC. On the other hand, effect of the forming temperature gives impact to the evolution of the microstructure from large grain size (as-cast) to the smaller grains size (0.00797mm2) forming at 560°C. This relate to the extensive dynamic recrystallization (DRX) occurs during forming and Mg-Al-Zn was sensitive with heat either direct or indirect heating method.

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“…For several decades, as excellent light metal and structural materials, magnesium alloys have been widely used in industrial fields such as transportation, building, electronic products, etc [1][2][3][4][5][6][7][8] . Furthermore, because of non-toxic properties and good biocompatibility, magnesium alloys are increasingly focused on the biomedical field [9][10][11] .…”

Section: Introductionmentioning

confidence: 99%

Surface Properties Contrast between Al Films and TiO2 Films Coated on Magnesium Alloys by Magnetron Sputtering

Zhu

Chen

et al. 2017

Mat. Res.

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Al films and TiO 2 films were separately coated on AZ31 magnesium alloy substrates by means of magnetron sputtering method. The surface properties of the samples were explored and compared. Scanning electron microscope (SEM) observed the compact structure characteristics of as-deposited Al films and TiO 2 films. After heat treatment under 200ºC for half an hour the films kept the compact structure characteristics and there didn't exist structural defects on the surface of the films. Nano-indentation measurement results display that the micro-hardness of as-deposited Al film and TiO 2 film reaches about 1.90 Gpa and 1.51 Gpa, separately. Al film is a bit harder than TiO 2 film. Finally, the corrosion experiments in simulated body fluid initially indicate the different corrosion properties for Al film and TiO 2 film. Al film presents more effective anti-corrosion properties than TiO 2 film.

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Solution and ageing heat treatments of ZK60 magnesium alloys with rare earth additions produced by semi-solid casting

Cited by 14 publications

References 24 publications

Effect of Heat Treatment on the Microstructure of Mg-4Al-Nd Alloys

Effect of Heat Treatment on the Microstructure of Mg-4Al-Nd Alloys

Effect of semi-solid forming temperature and heat treatment on mechanical properties and microstructure of Mg-Al-Zn Alloy (AZ91D) for automotive light application

Surface Properties Contrast between Al Films and TiO2 Films Coated on Magnesium Alloys by Magnetron Sputtering

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