Microstructure and mechanical properties of micro-alloying modified Al-Mg alloys

Zhang, J.; Zhao, Jun; Zuo, Rui

doi:10.2991/peee-15.2015.41

Cited by 4 publications

(2 citation statements)

References 10 publications

(10 reference statements)

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“…The content of impurity solutes in the atomized powders was reduced with increased Er addition. This trend has also been found in literature where the levels of Fe and Si impurity in a 5052 Al alloy were reduced by Er addition due to Er combining with Si and Fe in the melt [14]. XRD spectra of the atomized powders indicate anAl solid solution as shown in Figure 1; Si peaks are from the added crystallographic standard powder to correct peak position.…”

Section: Methodssupporting

confidence: 60%

Thermal Stability of Cryomilled Al-Mg-Er Powders

Akinrinlola

Gauvin

Blais

et al. 2017

Journal of Nanomaterials

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In this study, the thermal stability of nanostructured Al-Mg alloy powders was investigated. Two alloy compositions, Al-5Mg-0.1Er and Al-5Mg-0.5Er (wt.%), were cryogenically milled for 30 h to produce nanostructured powders. The microstructure of the milled powders with increasing temperature was investigated by differential scanning calorimetry (DSC) with one-hour annealing performed at selected temperatures followed by X-ray diffraction (XRD) and electron microscopy analysis. Prolonged milling led to significant oxygen pick-up in the powders. The Al-5Mg-0.1Er powders experienced grain growth typical of cryomilled Al-Mg powders, while the Al-5Mg-0.5Er alloy showed improved thermal stability. An average grain size of ∼20 nm was observed up to 400 ∘ C (∼0.8 ) in the Al-5Mg-0.5Er powders, and abnormal growth at 550 ∘ C resulted in a maximum observed grain size of 234 nm. Thermal stability in the Al-Mg-Er powders is attributed to the combined effects of solute/impurity drag and second-phase pinning (nanoscale oxides, nitrides, and oxynitrides) that impede grain boundary motion.

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Section: Methodssupporting

confidence: 60%

Thermal Stability of Cryomilled Al-Mg-Er Powders

Akinrinlola

Gauvin

Blais

et al. 2017

Journal of Nanomaterials

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“…Al-Mg alloys are non-heat treatable, and they drive their strength from solid solution strengthening, grain refinement, and strain hardening. Al-Mg alloys with low Mg content have better formability and are more suitable for large wrought products [2]. An increase in the Mg content leads to a rise of Al 3 Mg 2 and Mg 5 Al 8 particles in the alloy.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of mechanical properties of cast and forged Al-3Mg-MnO2 and Al-8Mg-MnO2 composites

Narain¹,

Ray

2020

Heliyon

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The Al-Mg-MnO 2 composite is a MnO 2 particulate reinforced Al metal matrix composite. Its substantial ductility makes it promising composite for study. The Al-3Mg-MnO 2 and Al-8Mg-MnO 2 composites were synthesized by stirring 3, 5, and 8 wt% of MnO 2 particulates in Al-3Mg melt and Al-8Mg melt to study their mechanical properties. Their microstructure shows intermetallic precipitates of Al, Mg, and Mn at dendrites, grain boundaries and within the grains. In both sets of composites, the hardness, and the yield strength increases with increasing MnO 2 content in the cast and forged composites. Both the groups of composites show an increase in tensile strength with increasing particle content from 3 to 5 wt%, a further increase in particle content to 8 wt%, leads to an abrupt decrease in tensile strength in both the group of composites. The percentage elongations in forged composites are lower than those in cast composites, but this decrease is more prominent in Al-8Mg-MnO 2 composites in comparison to Al-3Mg-MnO 2 composites. The J IC value decreases as the percentage of MnO 2 particles increases in Al-3Mg-MnO 2 and Al-8Mg-MnO 2 composites. Forging increases J IC values in both the class of composites in comparison to their cast counterparts due to work hardening and healing of pores. Crack growth toughness also decreases as the MnO 2 particle content increases in Al-3Mg-MnO 2 and Al-8Mg-MnO 2 composites. Forged Al-3Mg-MnO 2 shows decreased T/E ratio in comparison to their cast counterparts except at 8wt%. However, forged Al-8Mg-MnO 2 shows improved T/E at 3wt% and a drop at 5wt% and 8wt% MnO 2 . Variation of crack growth toughness between cast and forged Al-8Mg-MnO 2 is minimal in comparison to that between cast and forged Al-3Mg-MnO 2 composites.

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