Rachel E. Lim
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View article: Elastic properties of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi mathvariant="normal">W</mml:mi><mml:mrow><mml:mn>0.75</mml:mn></mml:mrow></mml:msub><mml:mi mathvariant="normal">R</mml:mi><mml:msub><mml:mi mathvariant="normal">e</mml:mi><mml:mrow><mml:mn>0.25</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math> alloy at high pressure up to 183 GPa
Elastic properties of the alloy at high pressure up to 183 GPa Open
The high pressure equation of state for the W0.75Re0.25 alloy is experimentally determined up to 183 GPa with synchrotron angle-dispersive powder x-ray diffraction in the diamond-anvil cell and to ∼925 GPa with density-functional theory. W…
View article: Deconvoluting thermomechanical effects in X-ray diffraction data using machine learning
Deconvoluting thermomechanical effects in X-ray diffraction data using machine learning Open
X-ray diffraction is ideal for probing the sub-surface state during complex or rapid thermomechanical loading of crystalline materials. However, challenges arise as the size of diffraction volumes increases due to spatial broadening and be…
View article: Deconvoluting Thermomechanical Effects in X-ray Diffraction Data using Machine Learning
Deconvoluting Thermomechanical Effects in X-ray Diffraction Data using Machine Learning Open
X-ray diffraction is ideal for probing sub-surface state during complex or rapid thermomechanical loading of crystalline materials. However, challenges arise as the size of diffraction volumes increases due to spatial broadening and inabil…
View article: Improving equations of state calibrations in the toroidal DAC—The case study of molybdenum
Improving equations of state calibrations in the toroidal DAC—The case study of molybdenum Open
We report an updated isothermal equation of state (EoS) of molybdenum (Mo) obtained by compression in beveled and toroidal diamond-anvil cells (DACs). For an improved compression environment, we developed a copper (Cu) pressure-transmittin…
View article: Combining synchrotron X-ray diffraction, mechanistic modeling and machine learning for <i>in situ</i> subsurface temperature quantification during laser melting
Combining synchrotron X-ray diffraction, mechanistic modeling and machine learning for <i>in situ</i> subsurface temperature quantification during laser melting Open
Laser melting, such as that encountered during additive manufacturing, produces extreme gradients of temperature in both space and time, which in turn influence microstructural development in the material. Qualification and model validatio…
View article: Combining Synchrotron X-ray Diffraction, Mechanistic Modeling, and Machine Learning for In Situ Subsurface Temperature Quantification during Laser Melting
Combining Synchrotron X-ray Diffraction, Mechanistic Modeling, and Machine Learning for In Situ Subsurface Temperature Quantification during Laser Melting Open
Laser melting, such as that encountered during additive manufacturing (AM), produces extreme gradients of temperature in both space and time, which in turn influence microstructural development in the material. Qualification and model vali…
View article: Non-destructive depth-resolved characterization of residual strain fields in high electron mobility transistors using differential aperture x-ray microscopy
Non-destructive depth-resolved characterization of residual strain fields in high electron mobility transistors using differential aperture x-ray microscopy Open
Localized residual stress and elastic strain concentrations in microelectronic devices often affect the electronic performance, resistance to thermomechanical damage, and, likely, radiation tolerance. A primary challenge for the characteri…
View article: Non-destructive Depth-Resolved Characterization of Residual Strain Fields in High Electron Mobility Transistors using Differential Aperture X-ray Microscopy
Non-destructive Depth-Resolved Characterization of Residual Strain Fields in High Electron Mobility Transistors using Differential Aperture X-ray Microscopy Open
Localized residual stress and elastic strain concentrations in microelectronic devices often affect the electronic performance, resistance to thermomechanical damage, and, likely, radiation tolerance. A primary challenge for characterizati…
View article: The influence of alloying on slip intermittency and the implications for dwell fatigue in titanium
The influence of alloying on slip intermittency and the implications for dwell fatigue in titanium Open
Dwell fatigue, the reduction in fatigue life experienced by titanium alloys due to holds at stresses as low as 60% of yield, has been implicated in several uncontained jet engine failures. Dislocation slip has long been observed to be an i…
View article: High speed synchrotron X-ray diffraction experiments resolve microstructure and phase transformation in laser processed Ti-6Al-4V
High speed synchrotron X-ray diffraction experiments resolve microstructure and phase transformation in laser processed Ti-6Al-4V Open
The microstructures of Ti-6Al-4V following laser processing depend primarily on the phase transformation of β to α, but their development is constrained by the rapidly changing temperature in the small fusion zone. In-situ synchrotron X-ra…
View article: Three-Dimensional In Situ Texture Development and Plasticity\n Accumulation in the Cyclic Loading of an alpha-Ti Alloy
Three-Dimensional In Situ Texture Development and Plasticity\n Accumulation in the Cyclic Loading of an alpha-Ti Alloy Open
High-energy synchrotron x-rays are used to track grain rotations and the\nmicromechanical evolution of a hexagonal Ti-7Al microstructure as it is\ncyclically loaded below its macroscopic yield stress. The evolution of the\ngrains through 2…
View article: Three-Dimensional In Situ Texture Development and Plasticity Accumulation in the Cyclic Loading of an alpha-Ti Alloy
Three-Dimensional In Situ Texture Development and Plasticity Accumulation in the Cyclic Loading of an alpha-Ti Alloy Open
High-energy synchrotron x-rays are used to track grain rotations and the micromechanical evolution of a hexagonal Ti-7Al microstructure as it is cyclically loaded below its macroscopic yield stress. The evolution of the grains through 200 …