Atom Probe Analysis of Sr Distribution in AlSi Foundry Alloys

Barrirero, Jenifer; Engstler, Michael; Mücklich, Frank

doi:10.1002/9781118663189.ch50

Cited by 4 publications

(3 citation statements)

References 20 publications

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“…Rod-like segregations have been observed in previous APT studies [18][19][20]. However, the three-dimensional complexity of the segregations was not captured until now when wider [40][41][42].…”

Section: A Rod-like Segregationsmentioning

confidence: 76%

“…With the advent and development of high resolution transmission electron microscopy (HR-TEM), atomically resolved scanning transmission electron microscopy (STEM) and atom probe tomography (APT), high structural and 3D chemical resolution down to parts per million [17] is now attainable. Recent studies of Sr modified samples showed evidences of segregation of the modifier together with Al inside the Si phase [18][19][20]. The presence of Al was not expected or predicted by any of the previously mentioned theories of modification and it remains difficult to ascertain if its presence plays a decisive role.…”

Section: Introductionmentioning

confidence: 96%

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Comparison of segregations formed in unmodified and Sr-modified Al–Si alloys studied by atom probe tomography and transmission electron microscopy

Barrirero

Engstler

Ghafoor

et al. 2014

Journal of Alloys and Compounds

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Comparison of segregations formed in unmodified and Sr-modified Al-Si alloys studied by atom probe tomography and transmission electron microscopy, 2014, Journal of Alloys and Compounds, (611) AbstractThe mechanical properties of Al-7 wt.% Si can be enhanced by structural modifications of its eutectic phase. Addition of low concentrations of certain elements, in this case 150 wt-ppm Sr, is enough to cause a transition from a coarse plate-like Si structure to a finer coralline one. To fully understand the operating mechanism of this modification, the composition of the eutectic Si phase in unmodified and Sr-modified alloys was analysed and compared by Atom Probe Tomography and (Scanning) Transmission Electron Microscopy. The unmodified alloy showed nanometre sized Al-segregations decorating defects, while the Sr-modified sample presented three types of Al-Sr segregations: (1) rod-like segregations that promote smoothening of the Al-Si boundaries in the eutectic phase, (2) particle-like segregations comparable to the ones seen in the unmodified alloy, and (3) planar segregations favouring the formation of twin boundaries. Al and Sr solubilities in Si after solidification were determined to be 430 ± 160 at-ppm and 40 ± 10 at-ppm, respectively. Sr predominantly segregates to the Si phase confirming its importance in the modification of the eutectic growth.

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Section: A Rod-like Segregationsmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 96%

Comparison of segregations formed in unmodified and Sr-modified Al–Si alloys studied by atom probe tomography and transmission electron microscopy

Barrirero

Engstler

Ghafoor

et al. 2014

Journal of Alloys and Compounds

Self Cite

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“…The first one is that the silicon particles form an extended network in the whole volume of the specimen contrary to the copper and iron intermetallics phases . The second explanation is the coarser morphology of the silicon particles which generate large stress concentration in this material that has been Sr modified but has not undergone a solution heat treatment. Lastly, the eutectic silicon is more brittle than other hard inclusions at high temperatures .…”

Section: Resultsmentioning

confidence: 99%

Damage Investigation in A319 Aluminium Alloy by X‐ray Tomography and Digital Volume Correlation during In Situ High‐Temperature Fatigue Tests

Dahdah

Limodin

Bartali

et al. 2016

Strain

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The aim of this work is to analyse the strain field heterogeneity in an aluminium alloy subjected to low‐cycle fatigue at high temperature. In the cylinder heads produced by a lost‐foam casting process, the microstructure of the studied alloy consists hard intermetallic phases and large gas and microshrinkage pores. In order to study the influence of this complex 3D microstructure on fatigue crack initiation and propagation at 250 °C, an experimental protocol using laboratory and synchrotron tomography, finite element simulation and a new digital volume correlation platform have been used. The results showed the role of pores in the crack nucleation and highlighted the importance of hard phases in the crack propagation, thanks to the resolution on the DVC measurement.

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Application of Synchrotron Radiation–Computed Tomography In-Situ Observations and Digital Volume Correlation to Study Low-Cycle Fatigue Damage Micromechanisms in Lost Foam Casting A319 Alloy

Wang¹,

Limodin

Bartali

et al. 2020

Metall Mater Trans A

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Atom Probe Analysis of Sr Distribution in AlSi Foundry Alloys

Cited by 4 publications

References 20 publications

Comparison of segregations formed in unmodified and Sr-modified Al–Si alloys studied by atom probe tomography and transmission electron microscopy

Comparison of segregations formed in unmodified and Sr-modified Al–Si alloys studied by atom probe tomography and transmission electron microscopy

Damage Investigation in A319 Aluminium Alloy by X‐ray Tomography and Digital Volume Correlation during In Situ High‐Temperature Fatigue Tests

Application of Synchrotron Radiation–Computed Tomography In-Situ Observations and Digital Volume Correlation to Study Low-Cycle Fatigue Damage Micromechanisms in Lost Foam Casting A319 Alloy

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