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On the Stability of Mg Nanograins to Coarsening after Repeated Melting
Journal article   Peer reviewed

On the Stability of Mg Nanograins to Coarsening after Repeated Melting

Shahram Amini, Jose M Cordoba Gallego, Andrew R McGhie, Chaoying Ni, Lars Hultman, Magnus Oden and Michel W Barsoum
Nano letters, v 9(8), pp 3082-3086
2009
DOI: https://doi.org/10.1021/nl9015683
PMID: 19606848

Abstract

Natural Sciences Naturvetenskap
Herein we report on the extraordinary thermal stability of similar to 35 nm Mg-nanograins that constitute the matrix of a Ti2AlC-Mg composite that has previously been shown to have excellent mechanical properties. The microstructure is so stable that heating the composite three times to 700 degrees C, which is 50 degrees C over the melting point of Mg, not only resulted in the repeated melting of the Mg, but surprisingly and within the resolution of our differential scanning calorimeter, did not lead to any coarsening. The reduction in the Mg melting point due to the nanograins was similar to 50 degrees C. X-ray diffraction and neutron spectroscopy results suggest that thin, amorphous, and/or poorly crystallized rutile, anatase, and/or magnesia layers separate the Mg nanograins and prevent them from coarsening. Clearly that layer is thin enough, and thus mechanically robust enough, to survive the melting and solidification stresses encountered during cycling. Annealing in hydrogen at 250 degrees C for 20 h, also did not seem to alter the grain size significantly.

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16 citations in Web of Science
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Collaboration types
Domestic collaboration
International collaboration
Web of Science research areas
Chemistry, Multidisciplinary
Chemistry, Physical
Materials Science, Multidisciplinary
Nanoscience & Nanotechnology
Physics, Applied
Physics, Condensed Matter
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