Development of a New Wrought Magnesium-Aluminum-Manganese Alloy AM30

Luo, Alan A.; Sachdev, Anil K.

doi:10.1007/s11661-007-9129-2

Cited by 90 publications

(30 citation statements)

References 12 publications

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“…The elongation also increased threefold to 17.3 pct, but not as high as 20.6 pct for the binary Mg-0.2 pct Ce alloy. The tensile properties of the Mg-3Al alloy are similar to those reported for Mg-3 pct Al-0.3Mn alloy AM30, [3] with slightly lower YS and UTS in the binary alloy. However, the results in Figure 13 show no significant improvement in tensile properties by adding Ce up to 0.5 pct to the Mg-3Al binary alloy, although the values did increase slightly.…”

Section: A Extrudabilitysupporting

confidence: 79%

“…[1] However, wrought magnesium alloys are not widely used due to their low room-temperature formability and crashworthiness compared to steel or aluminum alloys as a result of the limited slip systems present in magnesium. Recently, there have been many attempts [2][3][4][5][6][7][8][9] to develop new magnesium extrusion alloys with enhanced workability and ductility for structural applications.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Properties of Extruded Magnesium-Aluminum-Cerium Alloy Tubes

Luo

Mishra

et al. 2010

Metall Mater Trans A

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Current commercial magnesium extrusion alloys do not offer desirable combinations of strength, ductility, and extrusion speed for automotive structural applications. The effect of small additions of cerium (Ce) to pure magnesium (Mg) and Mg-3 pct Al alloy extruded tubes has been studied. The results suggest that 0.2 pct Ce addition can significantly improve the extrudability and mechanical properties of the Mg extrusions. The improvement in mechanical properties is due to grain refinement and dispersion strengthening provided by the Mg 12 Ce particles and the beneficial texture obtained. Higher Ce contents further increase strength, but significantly reduce ductility and cause excessive surface oxidation during extrusion. The beneficial effect of 0.2 pct Ce on mechanical properties of pure Mg is not observed when it is added to Mg-3 pct Al alloy, due to the higher affinity of Ce to Al to form the Al 11 Ce 3 phase in the MgAl-Ce ternary alloys. The Mg-0.2 pct Ce alloy is a promising base alloy for further development in automotive applications; however, Al should be avoided in Mg-Ce-based extrusion alloys.

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Section: A Extrudabilitysupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Extruded Magnesium-Aluminum-Cerium Alloy Tubes

Luo

Mishra

et al. 2010

Metall Mater Trans A

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“…For metal sheets with high ductility, such as Al or steel, n values are typically about 0.20-0.50 at room temperature [33], while the n values of most magnesium alloys are lower than 0.2. For example, n values of AZ31 and AM30 alloy sheets were 0.14 and 0.17, respectively [34]. However, the present Mg-Gd-Zn sheets exhibit high n values ranging from 0.24 to 0.29 as observed in this study (see Table 4).…”

Section: Ductilitysupporting

confidence: 52%

Excellent room-temperature ductility and formability of rolled Mg–Gd–Zn alloy sheets

Chen

Han

2011

Journal of Alloys and Compounds

234

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“…For this purpose, the filiformlike corrosion of the Mg-Al-Mn alloy AM30 was investigated using electrochemical and TEM techniques with reference to the previously reported AZ31B results of Cano et al 12 AM30 nominally contains 3 wt% Al and 0.4 wt% Mn, with the absence of Zn being the compositional factor differentiating it from AZ31B. 18 Microstructurally, AM30 is similar to AZ31B in that it is a solid solution alloy containing a relatively small volume fraction of intermetallic Al-Mn particles. 19,20 Studies documenting the corrosion behavior of AM30 in aqueous NaCl solutions have revealed that filaments form during exposure.…”

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Cathodic Activity of Corrosion Filaments Formed on Mg Alloy AM30

Cano

McDermid

Kish

2015

J. Electrochem. Soc.

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The filiform-like corrosion of extruded Mg alloy AM30 immersed in a dilute near-neutral NaCl solution was investigated using electrochemical techniques coupled with transmission electron microscopy (TEM). Scanning vibrating electrode technique (SVET) measurements showed that the filament-like corrosion consisted of an intensely anodic propagation front supported by a cathodicallyactivated filament behind. The TEM examination of the corroded and intact surface films in cross-section using thin foils prepared by focused-ion-beam (FIB) milling indicated that the cathodic activity was likely a combined result of the formation of a thick, highly-defective MgO film and the ability of Al-Mn intermetallic particles to catalyze the cathodic H 2 gas evolution reaction. The formation of an Al-rich layer at the film/alloy interface with time, due to the incongruent dissolution of the alloy, was not able to stop the initiation and propagation of the filaments. Mg and Mg alloys have been shown to be susceptible to the formation of laterally-spreading products, which tend to manifest as thread-like "filaments" or radially-expanding "discs" during corrosion in aqueous NaCl solutions. [1][2][3][4][5][6][7][8][9][10][11][12] Williams et al. have offered critical insights into the electrochemical mechanism of this unique localized corrosion mode on pure Mg 1,5,7 and the Mg-Al-Zn-Mn alloy AZ31B 9 by employing the scanning vibrating electrode technique (SVET), where their SVET measurements showed that the corrosion filaments/discs became cathodically-activated following their formation. It was proposed that the net cathode on the locally corroded regions galvanically coupled with the adjacent intensely anodic regions to drive the lateral propagation of the corrosion products across the exposed surface. The formation of discs versus filaments was suggested to depend on whether the catalytic efficiency of the locally corroded region allowed for galvanic coupling with its perimeter, or merely along the most anodic pathways of the microstructure.7 This "differential electrocatalytic" mechanism was also shown to drive filiform corrosion on coated Mg as determined by scanning Kelvin probe (SKP) measurements. 1The mechanism, however, by which the cathodic reaction (H 2 gas evolution) is enhanced on corroded Mg or Mg alloys continues to be unclear. Proposed mechanisms include (i) the enrichment of noble secondary phase constituents such as iron (Fe) impurity particles (for pure Mg) or Al-Mn intermetallic particles (for AZ31B) within the corroded regions 5,9,13,14 (ii) an increased catalytic tendency of the corroded regions caused either by undissolved metallic Mg "chunks," 15 a significantly roughened surface film 5 or the formation of Mg(OH) 2 as a corrosion product. 16 The SVET measurements reported by Williams et al. suggested that a significantly reduced cathodic activation was exhibited by the as-cast AZ31B corrosion filaments 9 relative to the corrosion discs on pure Mg.5 This finding agrees well with the noble secondary phase theory,...

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Development of a New Wrought Magnesium-Aluminum-Manganese Alloy AM30

Cited by 90 publications

References 12 publications

Microstructure and Mechanical Properties of Extruded Magnesium-Aluminum-Cerium Alloy Tubes

Microstructure and Mechanical Properties of Extruded Magnesium-Aluminum-Cerium Alloy Tubes

Excellent room-temperature ductility and formability of rolled Mg–Gd–Zn alloy sheets

Cathodic Activity of Corrosion Filaments Formed on Mg Alloy AM30

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