As-cast morphology of iron-intermetallics in Al–Si foundry alloys

Dinnis, C. M.; Taylor, J. A.; Dahle, A. K.

doi:10.1016/j.scriptamat.2005.06.028

Cited by 239 publications

(122 citation statements)

References 11 publications

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“…[15] Only a few tomographic investigations have been performed on the b phases in concentrated AlSi alloys (i.e., the studies by Terzi, [16] Dinnis, [17] Timpel [18] and Puncreobutr [19] ). The available literature lacks a 3D visualization of b platelets in typical cast alloys with different Si and Fe concentrations, so little is known regarding the morphology of intermetallics and interactions with primary a-Al and AlSi eutectics.…”

Section: Introductionmentioning

confidence: 99%

“…The deep etching technique [20,21] also allows to show the intermetallics but with destroying of their spatial, possible location to dendrites and other intermetallics and in the very restricted area. An advantage and uniqueness of the current investigation compared to the existing studies [16][17][18][19] is the application of perfectly controlled solidification and flow conditions conducted in the Artemis [22][23][24] facility. The microstructures produced by use of a controlled temperature gradient, cooling rate, and solidification front velocity allow the assessment of the designed microstructures and establishment of the relationship to similar structures formed in real castings.…”

Section: Introductionmentioning

confidence: 99%

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Interplay Between Melt Flow and the 3D Distribution and Morphology of Fe-Rich Phases in AlSi Alloys

Mikołajczak

Ratke

2014

Metall Mater Trans A

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The presence of Fe aids in establishing the mechanical and physical properties of AlSi alloys and is also one of the main impurities leading to formation of b-Al 5 FeSi intermetallics. This study aims to understand the effect of fluid flow on the dendritic microstructure with intermetallics in Al-5/7/9 wt pct Si-0.2/0.5/1.0 wt pct Fe alloys that are directionally solidified under defined thermal and fluid flow conditions. We made extensive use of 3D X-ray tomography to obtain a better insight into the morphology and formation of the intermetallics. Three-dimensional (3-D) distribution of intermetallics presented here shows that the growth of large b-Al 5 FeSi due to forced flow occurs in the eutectic specimen center and together with an increase in the number density of b precipitates. The 3D reconstructions have verified the b shaped to be curved, bent with twining, branched, and to have imprints, holes, and propeller-shaped platelets. The 3D views showed that hole-shaped b arose from the lateral growth around a-Al dendrites. These views also confirmed the phenomenon of shortening of b as an effect of flow in the dendritic region, where b could be fragmented or completely remelted, and ultimately resulting in microstructures with shorter b-Al 5 FeSi and increases in number density. The analysis revealed an interaction between melt flow, 3D distribution, and the morphology of b-Al 5 FeSi. The growth of a large and complex group of b intermetallics can reduce the melt flow between dendrites and strengthen pore nucleation and eutectic colonies nucleation, leading to lower permeability of the mushy zone and increased porosity in the castings.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Interplay Between Melt Flow and the 3D Distribution and Morphology of Fe-Rich Phases in AlSi Alloys

Mikołajczak

Ratke

2014

Metall Mater Trans A

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“…Perubahan morfologi inilah yang menyebabkan kekerasan Brinell dan kekerasan partikel silikon meningkat seiring dengan semakin lama waktu aging sampai pada titik optimal yaitu pada kondisi aging 8 jam. Pengujian mengenai proses modifikasi dari bentuk partikel silikon melalui perlakuan panas yang dapat meningkatkan sifat mekanis yang meliputi nilai kekerasannya, sehingga memperbaiki kualitas operasional dari paduan tersebut [13].…”

Section: Gambar 4 Kekerasan Tiap Fase Setelah Pengerasan Presipitat unclassified

“…Peningkatan kekerasan disebabkan karena terjadinya mekanisme penguatan akibat terhambatnya pergerakan dislokasi oleh partikel fase. Mekanisme pengerasan yang dihasilkan oleh proses pengkasaran fase kedua tergantung pada dua faktor yaitu ukuran partikel dan jarak antar partikel [13].…”

Section: Gambar 4 Kekerasan Tiap Fase Setelah Pengerasan Presipitat unclassified

Proses Penuaan (Aging) pada Paduan Aluminium AA 333 Hasil Proses Sand Casting

Zulfia

Juwita

Uliana

et al. 2010

jtm

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“…Further development by using deep etching and scanning electron microscopy analysis showed that the beta phase actually has a plate-like structure. Dinnis et al [18] who performed 2D serial sectioning to build 3D images were the first to show this plate-like precipitates are interconnected. However, as pointed out by Kral, [14] phase identification based on 2D morphology may be erroneous and the present paper shows an example where such an error could be possible.…”

mentioning

confidence: 99%