Investigation of the site occupation of atoms in pure and doped intermetallic

Boll, Torben; Al-Kassab, T.; Yuan, Ye; Liu, Zhiguo

doi:10.1016/j.ultramic.2007.02.011

Cited by 70 publications

(24 citation statements)

References 6 publications

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“…Over the last few decades, APT has been the technique of choice for compositional analysis in many metallic materials due to its inherent capability for the element-specific quantitative probing at sub-nanometer scale. The occasional high resolution in atom probe can resolve the individual lattice planes and various structural analyses in metallic alloys including solute site occupancy in γ′ precipitates in Ni-base superalloys have been reported earlier [3,[6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 86%

“…There have been many attempts to study the sub-lattice site occupancies of various solutes in ordered compounds using atom probe tomography (APT) [3,6,7]. Over the last few decades, APT has been the technique of choice for compositional analysis in many metallic materials due to its inherent capability for the element-specific quantitative probing at sub-nanometer scale.…”

Section: Introductionmentioning

confidence: 99%

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Determination of solute site occupancies within γ′ precipitates in nickel-base superalloys via orientation-specific atom probe tomography

et al. 2015

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The analytical limitations in atom probe tomography such as resolving a desired set of atomic planes, for solving complex materials science problems, have been overcome by employing a well-developed unique and reproducible crystallographic technique, involving synergetic coupling of orientation microscopy with atom probe tomography. The crystallographic information in atom probe reconstructions has been utilized to determine the solute site occupancies in Ni-Al-Cr based superalloys accurately. The structural information in atom probe reveals that both Al and Cr occupy the same sub-lattice within the L12-ordered γ' precipitates to form Ni3(Al,Cr) precipitates in a Ni-14Al-7Cr (at%) alloy. Interestingly, the addition of Co, which is a solid solution strengthener, to a Ni-14Al-7Cr alloy results in the partial reversal of Al site occupancy within γ' precipitates to form (Ni,Al)3(Al,Cr,Co) precipitates. This unique evidence of reversal of Al site occupancy, resulting from the introduction of other solutes within the ordered structures, gives insights into the relative energetics of different sub-lattice sites when occupied by different solutes.

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Section: Introductionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Determination of solute site occupancies within γ′ precipitates in nickel-base superalloys via orientation-specific atom probe tomography

et al. 2015

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“…GM-SRO analysis allows higher-order atom correlations (pairwise and upwards) in simple binary and multicomponent systems, and is carried out on experimental APT data by shell-based counting of the atoms at discrete 3D radial distances, accounting for limited detector efficiency and spatial resolution from the instrument [41]. In fact, this atom-by-atom analysis capacity has a very similar construction to that of a radial distribution function (RDF) for APT data [42][43][44][45], including chemical species-specific "partial RDFs" and pair correlation functions, all of which extend the application of 3D atom probe data from statistical analysis using 1D Markov chains and the Johnson and Klotz ordering parameter [29,[46][47][48][49] to a wealthier description of SRO that compliments existing capability for long-range order (LRO) and site occupancy investigation [26,[50][51][52][53][54][55][56][57][58][59].…”

Section: Short-range Ordermentioning

confidence: 95%

Mining information from atom probe data

et al. 2015

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Whilst atom probe tomography (APT) is a powerful technique with the capacity to gather information containing hundreds of millions of atoms from a single specimen, the ability to effectively use this information creates significant challenges. The main technological bottleneck lies in handling the extremely large amounts of data on spatial-chemical correlations, as well as developing new quantitative computational foundations for image reconstruction that target critical and transformative problems in materials science. The power to explore materials at the atomic scale with the extraordinary level of sensitivity of detection offered by atom probe tomography has not been not fully harnessed due to the challenges of dealing with missing, sparse and often noisy data. Hence there is a profound need to couple the analytical tools to deal with the data challenges with the experimental issues associated with this instrument. In this paper we provide a summary of some key issues associated with the challenges, and solutions to extract or "mine" fundamental materials science information from that data.

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“…[103] Another limitation is the loss of crystallographic information, strongly dependent on the alloy, and À experimental parameters; in some regions of the reconstruction can lattice planes of certain directions be resolved (pole regions À poles). Although, in special cases, APT can be used to clarify occupancy of elements on sublattices [104,105] or it has been shown that crystallographic arrangement of atoms may be regained altogether. [106,107] www.advancedsciencenews.com www.aem-journal.com…”

Section: Functionalitymentioning

confidence: 99%

Clustering in Age‐Hardenable Aluminum Alloys

et al. 2018

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This review gives an overview of the effects of clusters in various aluminum alloys. Characterization methods are discussed in general and results for the important AlMgSi alloys are presented in detail. Indirect characterization methods, such as hardness, tensile testing, electrical resistivity, differential scanning calorimetry, and positron annihilation spectroscopy are discussed, as well as atom probe tomography for the direct measurement of clusters. A particular focus is set on atom probe tomography, where possible artifacts influencing the cluster measurements as well as different cluster finding methods are summed up. A comprehensive summary of investigated alloys and cluster algorithm parameters is given. Moreover, the findings in AlMgSi alloys regarding clusters and changes upon different heat treatments are discussed, starting from early to the latest works. Drawn conclusions are discussed and compared to give a r esum e.

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Investigation of the site occupation of atoms in pure and doped intermetallic

Cited by 70 publications

References 6 publications

Determination of solute site occupancies within γ′ precipitates in nickel-base superalloys via orientation-specific atom probe tomography

Determination of solute site occupancies within γ′ precipitates in nickel-base superalloys via orientation-specific atom probe tomography

Mining information from atom probe data

Clustering in Age‐Hardenable Aluminum Alloys

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