11 Result(s)
within
Christopher M. Barr
English
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Article
The radiation instability of thermally stable nanocrystalline platinum gold
Recent experimentally validated alloy design theories have demonstrated nanocrystalline binary alloys that are stable against thermally induced grain growth. An open question is whether such thermal stability ...
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Article
Autonomous healing of fatigue cracks via cold welding
Fatigue in metals involves gradual failure through incremental propagation of cracks under repetitive mechanical load. In structural applications, fatigue accounts for up to 90% of in-service failure1,2. Preventi...
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Article
Crystallization kinetics and thermodynamics of an Ag–In–Sb–Te phase change material using complementary in situ microscopic techniques
The crystallization of an amorphous Ag–In–Sb–Te (AIST) phase change material (PCM) is studied using multiple in situ imaging techniques to directly quantify crystal growth rates over a broad range of temperatures...
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Article
Open AccessThe mechanical response of micron-sized molecular crystals
Microstructures and corresponding properties of compacted powders ultimately depend on the mechanical response of individual particles. In principle, computational simulations can predict the results of powder...
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Chapter and Conference Paper
Watching High-Cycle Fatigue with Automated Scanning Electron Microscope Experiments
Fatigue is a multistep process where cyclic loading causes damage within materials that eventually leads to crack formation and propagation. In nanocrystalline metals, a dominant damage mechanism is the abnorm...
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Article
Open AccessHardening in Au-Ag nanoboxes from stacking fault-dislocation interactions
Porous, nano-architected metals with dimensions down to ~10 nm are predicted to have extraordinarily high strength and stiffness per weight, but have been challenging to fabricate and test experimentally. Here...
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Article
Application of In Situ TEM to Investigate Irradiation Creep in Nanocrystalline Zirconium
This work characterizes the irradiation creep response of nanocrystalline zirconium by nanoscale quantitative tensile loading and ion irradiation experiments performed simultaneously in situ inside a transmiss...
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Article
In Situ High-Cycle Fatigue Reveals Importance of Grain Boundary Structure in Nanocrystalline Cu-Zr
Nanocrystalline metals typically have high fatigue strengths but low resistance to crack propagation. Amorphous intergranular films are disordered grain boundary complexions that have been shown to delay crac...
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Article
Interplay Between Grain Boundaries and Radiation Damage
The need for enhanced radiation-tolerant materials for advanced nuclear energy designs has resulted in a growing number of investigations that have explored the effect of grain boundaries under irradiation. Th...
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Article
Open AccessTracking the evolution of intergranular corrosion through twin-related domains in grain boundary networks
Tailoring the grain boundary network is desired to improve grain boundary-dependent phenomena such as intergranular corrosion. An important grain boundary network descriptor in heavily twinned microstructures ...
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Article
Grain boundary character dependence of radiation-induced segregation in a model Ni–Cr alloy
Ni-based fcc alloys are frequently used as critical structural materials in nuclear energy applications. Despite extensive studies, fundamental questions remain regarding point defect migration and solute segr...
