Mechanical alloying and milling of Al–Mg alloys

Scudino, Sergio; Sakaliyska, Mira; Surreddi, Kumar Babu; Eckert, J.

doi:10.1016/j.jallcom.2008.07.161

Cited by 70 publications

(42 citation statements)

References 29 publications

(67 reference statements)

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“…Additionally, MA offers the possibility to scale up the amount of processed material to tonnage quantities [11] and can be employed for the processing of nearly all types of materials [13][14][15][16][17]. This makes mechanical alloying the ideal processing route for small, as well as for large-scale production, of nanostructured materials.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of NanocrystallineMg-7.4%Al Powders Produced by Mechanical Alloying

Chaubey

Scudino

Khoshkhoo

et al. 2013

Metals

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Nanocrystalline Mg-7.4%Al powder was prepared by mechanical alloying using a high-energy mill. The evolution of the various phases and their microstructure, including size and morphology of the powder particles in the course of milling and during subsequent annealing, were investigated in detail. Room temperature milling leads to a rather heterogeneous microstructure consisting of two distinct regions: Al-free Mg cores and Mg-Al intermixed areas. As a result, the material is mechanically heterogeneous with the Mg cores displaying low hardness (40-50 HV) and the Mg-Al intermixed regions showing high hardness of about 170 HV. The Mg cores disappear and the microstructure becomes (also mechanically) homogeneous after subsequent cryo-milling. Rietveld structure refinement reveals that the crystallite size of the milled powders decreases with increasing the milling time reaching a minimum value of about 30 nm. This is corroborated by transmission electron microscopy confirming an average grain size of ~25 nm.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of NanocrystallineMg-7.4%Al Powders Produced by Mechanical Alloying

Chaubey

Scudino

Khoshkhoo

et al. 2013

Metals

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“…Since the changes in the Al lattice parameter are attributed to the Mg solutes, the lattice parameters in this cryomilled Al-Mg-Er system are compared to those obtained for mechanically milled prealloyed Al-Mg powders to determine solid solubility extensions. The results of Scudino et al [17] are used to estimate the Mg in solution for the milled powders. Data extracted from the diffraction patterns of the milled powders are compiled in Table 2 and grain size results from TEM image analysis are also included.…”

Section: Cryomilled Powdersmentioning

confidence: 99%

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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“…While for the high pressure solidification method, the Mg 17 Al 12 phase is formed and the b 0 phase cannot be observed in the solid solution during aging process [20]. As to mechanical milling, the Mg 2 Al 3 phase transforms into a nano-scale supersaturated Al solid solution, then the milled powders display a complex thermal behavior characterized by four distinct exothermic events and eventually transform to Mg 2 Al 3 phase upon heating [21]. It should be emphatically pointed out that although the low melting point of Mg (T m = 922 K) is favorable for alloying with Al (T m = 933 K), the relative high vapor pressure (ca.…”

Section: Introductionmentioning

confidence: 99%