AMC-SC1: A New Magnesium Alloy Suitable for Powertrain Applications

Bettles, Colleen Joyce; Forwood, C. T.; Jones, David S.; Griffiths, John R.; Frost, M. T.; John, D. H. St; Qian, Ma; Song, Guang‐Ling; Nie, Jian Feng

doi:10.4271/2003-01-1365

Cited by 20 publications

(17 citation statements)

References 3 publications

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“…A new magnesium alloy AM-SC1 has been recently developed for this purpose. [119,120] However, coolant corrosion is an important issue in the automotive industry. Considerable research has been conducted with regard to coolant corrosion and inhibition [121±126] and various brands of coolants have been developed and are commercially available in the market for aluminum and cast iron engine blocks.…”

Section: Coolant Corrosion and Inhibitionmentioning

confidence: 99%

“…For example, Mobil coolant 33 plus (MBL) is a traditional inorganic coolant. It is more corrosive to AM-SC1 at room temperature than at the high temperature of 95 C. [134] The average general corrosion rate of AM-SC1 (a new alloy with rare earth elements, zinc and zirconium as the main alloying elements, which was developed as an engine block material [119,120] ) immersed in MBL decreases as temperature increased. When the temperature was lower than 85 C, the general corrosion rate became unacceptable.…”

Section: Coolant Corrosion and Inhibitionmentioning

confidence: 99%

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Recent Progress in Corrosion and Protection of Magnesium Alloys

2005

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Magnesium alloys are advanced light structural and functional materials being increasingly used in the automotive, aerospace, electronic, and energy industries. However, their corrosion performance at the current stage of development is still not good enough for increasingly diverse practical applications. The Cooperative Research Centre for Cast Metals Manufacturing (CAST) in Australia is one of the most active research organizations in the world established to cope with the problems associated with the development and application of advanced light metals. Corrosion and prevention of magnesium and its alloys is an important part of CAST's research program. This paper presents a brief summary of recent research achievements by CAST and relevant research work in this area in the world. This overview covers “anodic hydrogen evolution”, estimation of corrosion rate, corrosion of aluminum‐ and non‐aluminum‐containing magnesium alloys, influences of composition and microstructure on corrosion, corrosion of a die‐cast magnesium alloy, galvanic corrosion, coolant corrosion, and an aluminum‐alloyed coating. The aim of this overview is to deepen the current understanding of corrosion and protection of magnesium and its alloys and to provide a base for future research work in this field.

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Section: Coolant Corrosion and Inhibitionmentioning

confidence: 99%

Section: Coolant Corrosion and Inhibitionmentioning

confidence: 99%

Recent Progress in Corrosion and Protection of Magnesium Alloys

2005

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“…Figure 6(b) shows the Zr-rich halos observed in a sand-cast Mg-RE-Zn-Zr alloy, AM-SC1. [15] It is clear that the dissolved Zr in a Zr-refined magnesium alloy is concentrated in many such characteristic Zr-rich haloes. Accordingly, it is logical to assume that the loss of dissolved Zr after remelting Table III. occurs primarily in these halos.…”

Section: A the Distribution Of Dissolved Zirconium In Zr-refined Magmentioning

confidence: 99%

“…Some halos contain about 2 pct Zr (the limit is 2.137 pct Zr [5] ). No intermetallic phases exist between Zr and Mg. [5] (b) BSE micrograph showing the typical grain structure of a sand-cast commercial Mg-RE-Zn-Zr alloy (AM-SC1 [15] ) plate sample (180 mm 9 120 mm 9 20 mm). Similar to binary magnesiumzirconium alloys, the multicomponent Mg-RE-Zn-Zr alloy is also characterized by Zr-rich halos.…”

Section: A the Distribution Of Dissolved Zirconium In Zr-refined Magmentioning

confidence: 99%

The Loss of Dissolved Zirconium in Zirconium-Refined Magnesium Alloys after Remelting

Qian

Hildebrand

StJohn

2009

Metall Mater Trans A

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Magnesium-rare earth-zirconium (Mg-RE-Zr) materials are a high value-added class of speciality alloys used chiefly for aerospace applications, where the use of zirconium ensures the critically needed structural uniformity and consistency in performance through potent grain refinement. However, the manufacture of these alloy components has proved to be problematic and volatile. A viable approach preferred by manufacturers is to simply remelt fully grainrefined prealloyed ingot materials and cast. Unfortunately, the dissolved Zr content in these alloys decreases appreciably after remelting, leading to significantly increased grain sizes and inhomogeneity. This work investigates the mechanisms responsible for the loss of dissolved Zr in Zr-refined magnesium alloys after remelting. It was revealed that the phenomenon stems from the unique Zr-rich cores existing in these alloys. Precipitation of zirconium from these supersaturated cores during heating reduces the dissolved Zr content in the a-Mg phase. On the other hand, once precipitated out, the zirconium precipitates show very limited dissolution in molten magnesium due to their discontinuous dissolution behavior in the absence of agitation. The loss of dissolved Zr was found to be reversible by agitation when remelted in an iron-free environment while irreversible in steel crucibles due to the interference from iron.

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“…AM-SC1 is a new alloy with rare earth elements, zinc and zirconium as the main alloying elements, which was developed as an engine block material [1,2]. AZ91D is one of the most common magnesium alloys, containing Al and Zn as its primary alloying elements.…”

Section: Specimensmentioning

confidence: 99%

Corrosion of magnesium alloys in commercial engine coolants

Song

StJohn

2005

Materials and Corrosion

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A number of magnesium alloys show promise as engine block materials. However, a critical issue for the automotive industry is corrosion of the engine block by the coolant and this could limit the use of magnesium engine blocks. This work assesses the corrosion performance of conventional magnesium alloy AZ91D and a recently developed engine block magnesium alloy AM-SC1 in several commercial coolants. Immersion testing, hydrogen evolution measurement, galvanic current monitoring and the standard ASTM D1384 test were employed to reveal the corrosion performance of the magnesium alloys subjected to the coolants. The results show that the tested commercial coolants are corrosive to the magnesium alloys in terms of general and galvanic corrosion. The two magnesium alloys exhibited slightly different corrosion resistance to the coolants with AZ91D being more corrosion resistant than AM-SC1. The corrosivity varied from coolant to coolant. Generally speaking, an organic-acid based long life coolant was less corrosive to the magnesium alloys than a traditional coolant. Among the studied commercial coolants, Toyota long life coolant appeared to be the most promising one. In addition, it was found that potassium fluoride effectively inhibited corrosion of the magnesium alloys in the studied commercial coolants. Both general and galvanic corrosion rates were significantly decreased by addition of KF, and there were no evident side effects on the other engine block materials, such as copper, solder, brass, steel and aluminium alloys, in terms of their corrosion performance. The ASTM D 1384 test further confirmed these results and suggested that Toyota long life coolant with 1%wt KF addition is a promising coolant for magnesium engine blocks.

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AMC-SC1: A New Magnesium Alloy Suitable for Powertrain Applications

Cited by 20 publications

References 3 publications

Recent Progress in Corrosion and Protection of Magnesium Alloys

Recent Progress in Corrosion and Protection of Magnesium Alloys

The Loss of Dissolved Zirconium in Zirconium-Refined Magnesium Alloys after Remelting

Corrosion of magnesium alloys in commercial engine coolants

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