On the many advantages of local-electrode atom probes

Kelly, Tom; Camus, Paula; Larson, David J.; Holzman, Louis M.; Bajikar, Sateesh S.

doi:10.1016/0304-3991(95)00086-0

Cited by 134 publications

(57 citation statements)

References 26 publications

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“…SEM was performed on mounted samples polished to a 0.02 μm finish and etched in a 100 ml HCl/100 ml deionized H 2 O/1g K 2 S 2 0 5 mixture, employing a LEO Gemini 1525™ field-emission SEM operated at 5 kV with a 20-30 μm aperture and a working distance of 6 mm. APT was performed with a local-electrode atom-probe (LEAP™) tomograph [16][17][18][19] at the Northwestern University Center for Atom-Probe Tomography (NUCAPT). Pulsed-laser APT data collection was performed at a target evaporation rate of 0.04 ions per pulse, a specimen temperature of 40.0±0.3 K, a pulse energy of 0.6 nJ, a pulse repetition rate of 200 kHz, and a background gauge pressure of < 6.7 x 10 -8 Pa.…”

Section: Methodsmentioning

confidence: 99%

Effects of a Tantalum Addition on the Morphological and Compositional Evolution of a Model Ni-Al-Cr Superalloy

Booth-Morrison

Noebe

Seidman

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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The effects of a 2.0 at.% addition of Ta to a model Ni-Al-Cr superalloy aged at 1073 K are assessed using scanning electron microscopy and atom-probe tomography. The addition of Ta results in appreciable strengthening, and the morphology is found to evolve from a bimodal distribution of spheroidal precipitates, to cuboidal precipitates aligned along the elastically soft <001>-type directions. Tantalum is observed to partition preferentially to the γ'-precipitate phase and decreases the mobility of Ni in the γ-matrix sufficiently to cause an accumulation of Ni on the γ-matrix side of the γ'-precipitate/γ-matrix heterophase interface.

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Section: Methodsmentioning

confidence: 99%

Effects of a Tantalum Addition on the Morphological and Compositional Evolution of a Model Ni-Al-Cr Superalloy

Booth-Morrison

Noebe

Seidman

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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“…APT and field-ion microscopy (FIM) experiments [25,26] were performed using conventional APT [27,28] and an Imago Scientific Instrument's LEAP tomograph [29]. Prior to conventional APT analysis, specimens were imaged at 40-50 K with FIM at background gauge pressures of neon that varied from 6.7 · 10 À4 to 2.6 · 10 À3 Pa (5 · 10 À6 to 2 · 10 À5 torr).…”

Section: Methodsmentioning

confidence: 99%

Temporal evolution of the nanostructure and phase compositions in a model Ni–Al–Cr alloy

et al. 2006

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In a Ni-5.2 Al-14.2 Cr at.% alloy with moderate solute supersaturations and a very small c/c 0 lattice parameter misfit, the nanostructural and compositional pathways during c 0 (L1 2 ) precipitation at 873 K are investigated using atom-probe tomography, conventional transmission electron microscopy, and hardness measurements. Nucleation of high number densities (N v > 10 23 m À3 ) of solute-rich precipitates (mean radius = AERae = 0.75 nm), with a critical nucleus composition of Ni-18.3 ± 0.9 Al-9.3 ± 0.7 Cr at.%, initiates between 0.0833 and 0.167 h. With increasing aging time (a) the solute concentrations decay in spheroidal precipitates (AERae < 10 nm); (b) the observed early-stage coalescence peaks at maximum N v in coincidence with the smallest interprecipitate spacing; and (c) the reaction enters a quasi-stationary regime where growth and coarsening operate concomitantly. During this quasi-stationary regime, the c (face-centered cubic)-matrix solute supersaturations decay with a power-law dependence of about À1/3, while the dependencies of AERae and N v are 0.29 ± 0.05 and À0.64 ± 0.06 at a coarsening rate slower than model predications. Coarsening models allow both equilibrium phase compositions to be determined from the compositional measurements. The observed early-stage coalescence is discussed in further detail.

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“…Recent developments of local electrode atom probes [1][2][3] open new opportunities for analysis of martensite decomposition at the atomic level. These modern instruments allow the collection of data in a shorter period of time from a larger volume of material compared to the previous generation atom probe field ion microscopes.…”

Section: Introductionmentioning

confidence: 99%

Observations of decomposition of martensite during heat treatment of steels using atom probe tomography

Pereloma

Ringer

Timokhina

et al. 2009

ESOMAT 2009 - 8th European Symposium on Martensitic Transformations

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Abstract. The decomposition of martensite during tempering or ageing is an important phenomenon as it leads to changes in the mechanical properties. These changes could take place during both steel manufacturing or in-service. Thus, their understanding is required to predict the material performance. Recent advances in the development of local electrode atom probes has led to a significant increase in the analysed volume of material (up to 100 millions of atoms) and at the same time reduced the acquisition times. This allows improvement in data statistics when investigating fine nanoscale features, such as solute segregation, clustering and ultrafine precipitation. Selected results of atom probe studies on the decomposition of martensite from bake hardening of a pre-strained Transformation Induced Plasticity (TRIP) steel and ageing of FeNiTiMnAl maraging steel are presented.

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On the many advantages of local-electrode atom probes

Cited by 134 publications

References 26 publications

Effects of a Tantalum Addition on the Morphological and Compositional Evolution of a Model Ni-Al-Cr Superalloy

Effects of a Tantalum Addition on the Morphological and Compositional Evolution of a Model Ni-Al-Cr Superalloy

Temporal evolution of the nanostructure and phase compositions in a model Ni–Al–Cr alloy

Observations of decomposition of martensite during heat treatment of steels using atom probe tomography

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