Spinel growth in the interface of δ-Al2O3 fibre reinforced aluminium piston alloys

Dudek, H.J.; Borath, R.; Kleine, Andreas

doi:10.1007/bf00367901

Cited by 16 publications

(5 citation statements)

References 28 publications

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“…They claimed that a uniform layer of MgAl 2 O 4 was formed initially during the casting process by a reaction between the alloy and the oxygen within the air spaces of the preform. The MgAl 2 O 4 /Al 2 O 3 interface studied by high‐resolution electron microscopy (HREM), however, revealed discrete MgAl 2 O 4 crystallites with atomic bonding with Al 2 O 3 and a model of spinel growth was proposed as a result of transformation from hexagonal Al 2 O 3 to spinel (Dudek et al ., 1996).…”

Section: Introductionmentioning

confidence: 99%

High‐resolution electron microscope observation of interface microstructure of a cast Al‐Mg‐Si‐Bi‐Pb(6262)/Al₂O_3p composite

Zhou

Fan

Peng

et al. 2001

Journal of Microscopy

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SummaryHigh-resolution electron microscopy was employed to characterize the interface structure of a cast Al-Mg-Si-BiPb aluminium(6262)-based composite reinforced by a alumina particles with a trace of b alumina in order to investigate the behaviour of alloying elements in cast composites. Except for a few primary Mg 2 Si particles, few reaction products were detected at the interface of Al/a-Al 2 O 3 due to the unfavourable reaction kinetics during the squeeze-casting process. The Mg 2 Si particle has an orientation relationship with a-Al

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Section: Introductionmentioning

confidence: 99%

High‐resolution electron microscope observation of interface microstructure of a cast Al‐Mg‐Si‐Bi‐Pb(6262)/Al₂O_3p composite

Zhou

Fan

Peng

et al. 2001

Journal of Microscopy

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“…This interfacial layer in the T5 composite was conditions. [8,11] (2) The magnesium is the principal agent in strengthening not detected by the electron microprobe ( Figure 5), but the more sensitive technique of secondary ion mass the aluminum matrix. This is illustrated very clearly in role of the aluminum matrix in determining the strength of these composites and merits a quantitative examination.…”

Section: Discussionmentioning

confidence: 99%

“…[8,11] This depletes the amount of Mg while the T6 treatment agglomerates the silicon into available in the aluminum dendrites to form strengthening rounded particles.…”

Section: Discussionmentioning

confidence: 99%

The tensile strength of 339 aluminum reinforced with kaowool fibers: A comparison of T5 and T6 heat treatments

Baxter

Sachdev

1999

Metall Mater Trans A

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This study compares the effects of T5 and T6 heat treatment on the tensile strengths of both KAOWOOL fiber reinforced and unreinforced 339 aluminum. The 339 Al-T6 is stronger than 339 Al-T5 (as expected), but for a KAOWOOL/339 Al composite, the T5 condition is substantially stronger than the T6. The controlling parameter is the strength of the aluminum dendrites, which in turn is proportional to the concentration of magnesium retained in the dendrites. In the T5 condition, more than half of the magnesium is in the form of large intermetallics in both the unreinforced alloy and the KAOWOOL/ 339 Al composite. During a T6 heat treatment, magnesium in the intermetallics is redissolved. In the unreinforced T6 alloy, this additional magnesium is retained in and strengthens the dendrites. But in the T6 composite, the magnesium segregates extensively to the KAOWOOL/aluminum interfaces depleting and softening the dendrites. This factor alone is sufficient to account for the low strength of the T6 composites. The tensile strengths of both the T5 and T6 composites correspond to the calculated values for a perfectly bonded system.

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“…The rotating velocity of the test piece was 377 mm/s (180 rpm), assuming the melt flow velocity through the practical mold parts. The Mg content in the melt, which is reported as that would severely affect the behavior of the reaction with the oxides, [11][12][13][14] was varied from 0 to 1.5%. The Mg content was based on that in the commercially-available Al alloy castings.…”

Section: +1mentioning

confidence: 99%

Erosion Resistance of Heat-Treated Aluminum Cast Iron to Aluminum Alloy Melt

Asano,

Yamada,

Sugimura

2024

Mater. Trans.

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Improvement in the erosion resistance of permanent molds to aluminum alloy melt is required. Since chemically and mechanically stable layer containing aluminum oxides can be formed on the cast irons by aluminum addition and heat treatment, the layer would improve the erosion resistance of the cast iron in the running melt. In this study, cast irons with different aluminum contents were fabricated, then they were heat-treated to form the oxide layer on the surface. The optimum heat treatment conditions to form the stable layer and the erosion behavior of the cast irons were clarified. Heat treatment in air was found to result in the formation of a layer that consists of the oxides, such as Fe 2 O 3 , Fe 3 O 4 and Al 2 O 3 on the cast irons. Based on the castability of the cast irons and morphology of the layer, it was concluded that the addition of 3% aluminum in the cast iron and heat treatment at 1173 K for 10 hours was the most suitable treatment. The heat treatment drastically improved the erosion resistance of the cast iron. The addition of magnesium to the melt temporarily decreased the time to erosion, but increased the time to erosion again when more than 0.75% magnesium.

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Spinel growth in the interface of δ-Al2O3 fibre reinforced aluminium piston alloys

Cited by 16 publications

References 28 publications

High‐resolution electron microscope observation of interface microstructure of a cast Al‐Mg‐Si‐Bi‐Pb(6262)/Al₂O_3p composite

High‐resolution electron microscope observation of interface microstructure of a cast Al‐Mg‐Si‐Bi‐Pb(6262)/Al₂O_3p composite

The tensile strength of 339 aluminum reinforced with kaowool fibers: A comparison of T5 and T6 heat treatments

Erosion Resistance of Heat-Treated Aluminum Cast Iron to Aluminum Alloy Melt

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Spinel growth in the interface of δ-Al2O3 fibre reinforced aluminium piston alloys

Cited by 16 publications

References 28 publications

High‐resolution electron microscope observation of interface microstructure of a cast Al‐Mg‐Si‐Bi‐Pb(6262)/Al2O3p composite

High‐resolution electron microscope observation of interface microstructure of a cast Al‐Mg‐Si‐Bi‐Pb(6262)/Al2O3p composite

The tensile strength of 339 aluminum reinforced with kaowool fibers: A comparison of T5 and T6 heat treatments

Erosion Resistance of Heat-Treated Aluminum Cast Iron to Aluminum Alloy Melt

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High‐resolution electron microscope observation of interface microstructure of a cast Al‐Mg‐Si‐Bi‐Pb(6262)/Al₂O_3p composite

High‐resolution electron microscope observation of interface microstructure of a cast Al‐Mg‐Si‐Bi‐Pb(6262)/Al₂O_3p composite