Three-dimensional characterization of ‘as-cast’ and solution-treated AlSi12(Sr) alloys by high-resolution FIB tomography

Lasagni, Fernando; Lasagni, Andrés Fabían; Marks, Esteban; Holzapfel, C.; Mücklich, Frank; Degischer, H. P.

doi:10.1016/j.actamat.2007.03.004

Cited by 134 publications

(86 citation statements)

References 15 publications

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“…The size and number density of b platelets depend on the chemical composition of the alloy, solidification conditions, etc., and earlier studies provide examples of b with sizes of 10, [38] 15, [39] 75, [34] 150, [33] 250, [26,27] 400, [15] 500, [16] 1000, [19] and 5-250 [30] lm. In the current study, the largest observed platelet was 1300-lm long, which means that X-ray tomography is more efficient at showing the real sizes of b compared to 2D microsections.…”

Section: D Morphology Of Fe-rich Phasesmentioning

confidence: 99%

“…[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%

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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: D Morphology Of Fe-rich Phasesmentioning

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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“…Two segmentation methods adapted to 3-D EDS were reported: (i) a straightforward method most commonly used to isolate one phase is to set up a threshold value for one of the elements [6,8,9] and (ii) a segmentation method developed by Kotula et al [10] based on multivariate statistical analysis-this method provides a set of statistically dominant phases with their corresponding spectrum. Both of these methods rely only on EDS measurements, without using the high spatial information given by SE images.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional chemical analysis of laser-welded NiTi–stainless steel wires using a dual-beam FIB

et al. 2013

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The biomedical industry has an increasing demand for processes to join dissimilar metals, such as laser welding of NiTi and stainless steel wires. A region of the weld close to the NiTi interface, which previously was shown to be prone to cracking, was further analyzed by energy dispersive spectrometry (EDS) extended in the third dimension using a focused ion beam. As the spatial resolution of EDS analysis is not precise enough to resolve the finest parts of the microstructure, a new segmentation method that uses in addition secondaryelectron images of higher spatial resolution was developed. Applying these tools, it is shown that this region of the weld close to the NiTi interface does not comprise a homogeneous intermetallic layer, but is rather constituted by a succession of different intermetallics, the composition of which can be directly correlated with the solidification path in the ternary Fe-Ni-Ti Gibbs simplex.

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“…21) Currently, there are several three-dimensional characterization methods available in materials science and engineering to achieve information of materials; three-dimensional atomic probe at atomic resolution, 22,23) (S)TEM tomography at a few nanometer resolution, [24][25][26] and FIB-tomography at submicron resolution. 27,28) Among these methods, FIBtomography by dual-beam FIB machine is the most suitable methods to study a large volume for correlating the macroscopic properties with micro/nanostructures since the maximum volume size is almost limitless, x-y resolution is that of the scanning electron microscope (SEM) and z resolution is the slice thickness. [27][28][29][30] FIB-tomography consist of the serial sectioning procedure; alternate repetition of milling of thin layers of the x-y planes with the ion beam in the z-© 2015 ISIJ direction and imaging those with the electron beam.…”

Section: Introductionmentioning

confidence: 99%

“…27,28) Among these methods, FIBtomography by dual-beam FIB machine is the most suitable methods to study a large volume for correlating the macroscopic properties with micro/nanostructures since the maximum volume size is almost limitless, x-y resolution is that of the scanning electron microscope (SEM) and z resolution is the slice thickness. [27][28][29][30] FIB-tomography consist of the serial sectioning procedure; alternate repetition of milling of thin layers of the x-y planes with the ion beam in the z-© 2015 ISIJ direction and imaging those with the electron beam.…”

Section: Introductionmentioning

confidence: 99%

Decorated Dislocations with Fine Precipitates Observed by FIB-SEM Slice-sectioning Tomography

et al. 2015

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Dispersion behavior of intragranular NbC precipitates in Nb added austenitic stainless steel were investigated via nanoscopic characterization in detail, FIB-SEM slice-sectioning tomography, orientation image microscopy, energy-dispersive X-ray spectrometry (EDS), selected area electron diffraction pattern (SAEDP) and transmission electron microscopy (TEM). The heterogeneous dispersion of fine intragranular NbC precipitates were visualized, and in particular, it was found that they were on the {111} slip plane and associated with dislocations.

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Three-dimensional characterization of ‘as-cast’ and solution-treated AlSi12(Sr) alloys by high-resolution FIB tomography

Cited by 134 publications

References 15 publications

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

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

Three-dimensional chemical analysis of laser-welded NiTi–stainless steel wires using a dual-beam FIB

Decorated Dislocations with Fine Precipitates Observed by FIB-SEM Slice-sectioning Tomography

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