Microstructure and dislocation analysis after creep deformation of die-cast Mg–Al–Sr (AJ) alloy

Kunst, Martin; Fischersworring‐Bunk, Andreas; L’Éspérance, Gilles; Plamondon, Philippe; Glatzel, Uwe

doi:10.1016/j.msea.2008.07.078

Cited by 49 publications

(34 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This alloy is characterized not only by a high strength-to-weight ratio synonymous with magnesium alloys but also by relatively good properties at elevated temperatures [28]. AJ62 is the only Mg-Al alloy thus far to have been used in the mass production of an automotive power train crankcase [29].…”

Section: Introductionmentioning

confidence: 99%

The effect of current mode and discharge type on the corrosion resistance of plasma electrolytic oxidation (PEO) coated magnesium alloy AJ62

Hussein

Zhang

Nie

et al. 2011

Surface and Coatings Technology

210

View full text Add to dashboard Cite

Magnesium alloys are increasingly being used as lightweight materials in the automotive, defense, electronics, biomaterial and aerospace industries. However, their inherently poor corrosion and wear resistance have, so far, limited their application. Plasma electrolytic oxidation (PEO) in an environmentally friendly aluminates electrolyte has been used to produce oxide coatings with thicknesses of~80 μm on an AJ62 magnesium alloy. Optical emission spectroscopy (OES) in the visible and near ultraviolet (NUV) band (285 nm-800 nm) was employed to characterize the PEO plasma. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to characterize the coated materials, and potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in a 3.5% NaCl solution were used to determine the corrosion behavior. It was found that the plasma discharge behavior significantly influenced the microstructure and the morphology of the oxide coatings and, hence the corrosion resistance. The corrosion resistance of the coated alloy was increased by changing the current mode from unipolar to bipolar, where the strong plasma discharges had been reduced or eliminated.

show abstract

Section: Introductionmentioning

confidence: 99%

The effect of current mode and discharge type on the corrosion resistance of plasma electrolytic oxidation (PEO) coated magnesium alloy AJ62

Hussein

Zhang

Nie

et al. 2011

Surface and Coatings Technology

210

View full text Add to dashboard Cite

show abstract

“…Its unique microstructure includes an Al 4 Sr intermtallic at the interdendritic regions rather than the Mg 17 Al 12 common to other magnesium-aluminum alloys. Previous studies [1][2][3][4] indicating the creep resisting mechanisms of this microstructure tout this alloy's elevated temperature superiority among magnesium alloys.…”

Section: Introductionmentioning

confidence: 72%

Corrosion of Permanent Mold Cast Magnesium Alloy AJ62 in Automotive Environments

Li¹,

Burns²,

Hu³

et al. 2014

Proceedings of the 2015 International Conference on Material Science and Applications

View full text Add to dashboard Cite

Abstract. Permanent mold cast (PMC) AJ62 magnesium alloy exhibits a fine-grained microstructure in the thin section and a coarse-grained microstructure in the thick section. Microstructure of the PMC AJ 62 alloy was analyzed by using the Scanning Electron Microscopy (SEM). Potentiodynamic polarization experiments were performed to investigate the corrosion resistances of the PMC AJ62 alloys in salt solutions and engine coolant. The corrosion behaviors in the fine-and coarse-grained AJ62 alloys were compared. The results show that the AJ62 alloy with fine microstructure presents enhanced corrosion resistance.

show abstract

“…Instead, two other intermetallic phases are present in AJ52, i.e., Al 4 Sr and Mg 9 Al 3 Sr, as reported in the literature. [16,41] The Al 4 Sr phase appears to have a regular eutectic morphology (lamellar), but the Mg 9 Al 3 Sr phase has a blocky morphology, indicating that the Mg 9 Al 3 Sr phase is fully divorced. There is still a supersaturation of Al in the eutectic a-Mg.…”

Section: A Microstructurementioning

confidence: 99%

Evaluation of Magnesium Die-Casting Alloys for Elevated Temperature Applications: Microstructure, Tensile Properties, and Creep Resistance

Zhu

Easton

Abbott³

et al. 2015

Metall Mater Trans A

127

View full text Add to dashboard Cite

Several families of magnesium die-casting alloys have been developed to operate at the elevated temperatures experienced in automotive powertrain applications. Most alloys are based on the Mg-Al system with alloying additions such as silicon, strontium, calcium, and rare earth elements (RE), although alloys with RE as the primary alloying constituent are also considered. This work presents an evaluation of the tensile properties and creep resistance of the most common magnesium die-casting alloys, in conjunction with the analysis of microstructure. The alloys investigated include AS31 (Mg-3Al-1Si), AJ52 (Mg-5Al-2Sr), MRI153A (Mg-9Al-1Ca-0.1Sr), MRI153M (Mg-8Al-1Ca-0.3Sr), MRI230D (Mg-6.5Al-2Ca-1Sn-0.3Sr), AXJ530 (Mg5Al-3Ca-0.2Sr), AE42 (Mg-4Al-2RE), AE44 (Mg-4Al-4RE), and AM-HP2+ (Mg-3.5RE-0.4Zn). It is shown that, among the various alloys evaluated, MRI230D, AXJ530, and AM-HP2+ have higher yield strength than the Al alloy A380, but the ductility is relatively low at room temperature for these alloys. In contrast, AS31 and the AE series alloys have very good room temperature ductility, but their yield strength is lower than that of A380. In terms of creep resistance, MRI230D, AXJ530, AE44, and AM-HP2+ are all comparable to the Al alloy counterpart at 423 K and 448 K (150°C and 175°C). Microstructural factors that are most important to the strength and creep resistance of the Mg die-casting alloys are discussed.

show abstract

Microstructure and dislocation analysis after creep deformation of die-cast Mg–Al–Sr (AJ) alloy

Cited by 49 publications

References 15 publications

The effect of current mode and discharge type on the corrosion resistance of plasma electrolytic oxidation (PEO) coated magnesium alloy AJ62

The effect of current mode and discharge type on the corrosion resistance of plasma electrolytic oxidation (PEO) coated magnesium alloy AJ62

Corrosion of Permanent Mold Cast Magnesium Alloy AJ62 in Automotive Environments

Evaluation of Magnesium Die-Casting Alloys for Elevated Temperature Applications: Microstructure, Tensile Properties, and Creep Resistance

Contact Info

Product

Resources

About