Journal ArticleDOI
In situ transmission electron microscopy of crystal growth-mode transitions during rapid solidification of a hypoeutectic Al–Cu alloy
Joseph T. McKeown,Andreas Kulovits,Can Liu,Kai Zweiacker,Bryan W. Reed,Thomas LaGrange,Jörg M.K. Wiezorek,Geoffrey H. Campbell +7 more
TLDR
In this article, a pulsed-laser-melted hypoeutectic Al-Cu thin-film alloy was monitored using in situ transmission electron microscopy with high spatial and temporal resolutions.About:
This article is published in Acta Materialia.The article was published on 2014-02-15. It has received 81 citations till now. The article focuses on the topics: Crystal growth.read more
Citations
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Formation of metastable cellular microstructures in selective laser melted alloys
TL;DR: In this article, the development of metastable cellular microstructures during the SLM solidification process by considering the Bernard Marangoni driven instability (BMI) and particle accumulated structure formation (PAS) mechanisms, where both thermodynamics and kinetics play a role.
Journal ArticleDOI
Modulating laser intensity profile ellipticity for microstructural control during metal additive manufacturing
Tien T. Roehling,Tien T. Roehling,Sheldon Wu,Saad A. Khairallah,John D. Roehling,S. Stefan Soezeri,Michael F. Crumb,Manyalibo J. Matthews +7 more
TL;DR: In this paper, the effects of laser intensity profile ellipticity on melt track macrostructures and microstructures were studied in 316L stainless steel, and the results were supported by temperature gradients and melt velocities simulated using the ALE3D multi-physics code.
Journal ArticleDOI
Tensile properties, strain rate sensitivity, and activation volume of additively manufactured 316L stainless steels
Zan Li,Thomas Voisin,Joseph T. McKeown,Jianchao Ye,T. Braun,Chandrika Kamath,Wayne E. King,Y. Morris Wang +7 more
TL;DR: In this article, the tensile properties of AM 316L stainless steels fabricated by the laser powder-bed-fusion (L-PBF) technique were examined and reported.
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Towards ultimate temporal and spatial resolutions with ultrafast single-electron diffraction
TL;DR: In contrast to bright pulses with many electrons, single-electron wave packets have no Coulomb repulsion at all and can hence have ultimate characteristics in space and time as mentioned in this paper, which can provide a four-dimensional visualization of atomic motion.
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Probing structural and electronic dynamics with ultrafast electron microscopy
TL;DR: In this article, the authors provide an overview of the field of ultrafast electron microscopy and describe the versatility enabled by the ease with which electron trajectories and velocities can be manipulated with TEM hardware configurations, and emphasize how this is translated to the ability to measure scattering intensities in real, reciprocal and energy space from presurveyed and selected nanoscale volumes.
References
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Book
Fundamentals of Solidification
W. Kurz,D. J. Fisher +1 more
TL;DR: In this article, Atom Transfer at the Solid/Liquid Interface Morphological Instability of a Solid/ Liquid Interface Solidification Microstructure: Cells and Dendrites SolidificationMicrostructure, Eutectic and Peritectic Solute Redistribution Rapid Solidization Microstructures Summary Appendices Symbols Index
Journal ArticleDOI
Stability of a Planar Interface During Solidification of a Dilute Binary Alloy
W. W. Mullins,R. F. Sekerka +1 more
TL;DR: In this article, the stability of a moving planar liquid-solid interface during unidirectional freezing of a dilute binary alloy is theoretically investigated by calculating the time dependence of the amplitude of a sinusoidal perturbation of infinitesimal amplitude introduced into the planar shape.
Journal ArticleDOI
Dendrite growth at the limit of stability: tip radius and spacing
Wilfried Kurz,D.J. Fisher +1 more
TL;DR: In this article, a general framework is proposed to relate tip radius, interface undercooling and primary arm spacing in alloy dendrite growth, and all the growth morphologies developed between the limiting morphology at low and at high velocity are described to a first approximation, using an ellipsoid of revolution.
Journal ArticleDOI
An Atomic-Level View of Melting Using Femtosecond Electron Diffraction
TL;DR: Observations of the structural evolution of aluminum as it underwent an ultrafast laser–induced solid-liquid phase transition provide an atomic-level description of the melting process, which is best understood as a thermal phase transition under strongly driven conditions.
Journal ArticleDOI
Double conical beam-rocking system for measurement of integrated electron diffraction intensities
R. Vincent,Paul A. Midgley +1 more
TL;DR: In this article, a double conical scanning system was designed to collect a large data set of integrated intensities that were more suitable for structure determination by electron diffraction, both by removing excitation errors due to curvature of the Ewald sphere and also by reducing non-systematic dynamical effects.
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