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|a Kalidindi, Arvind Rama
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|a Massachusetts Institute of Technology. Department of Materials Science and Engineering
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|a Schuh, Christopher A.
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|a Kalidindi, Arvind Rama
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|a Schuh, Christopher A
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|a Schuh, Christopher A
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|a Phase transitions in stable nanocrystalline alloys
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|b Cambridge University Press,
|c 2018-06-18T18:30:38Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/116375
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|a Grain boundary segregation can reduce the driving force for grain growth in nanocrystalline materials and help retain fine grain sizes. However, grain boundary segregation is enthalpically driven, and so a stabilized nanocrystalline state should undergo a disordering process as temperature is increased. Here we develop a Monte Carlo-based simulation that determines the minimum free energy state of an alloy with a strong tendency for grain boundary segregation that considers both different grain sizes and a large solute configuration space. We find that a stable nanocrystalline alloy undergoes a disordering process where grain boundary segregated atoms dissolve into the adjacent grains and increase the grain size as a function of temperature. At a critical temperature, the single crystal state becomes the most preferred. Using this method, we are able to determine how the grain size changes as a function of temperature and produce equilibrium phase diagrams for nanocrystalline alloys.
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|a United States. Army Research Office (Grant W911NF-14-1-0539)
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|a en_US
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|a Article
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|t Journal of Materials Research
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