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On the Stability of Mg Nanograins to Coarsening after Repeated Melting

机译：多次熔化后镁纳米颗粒对粗化的稳定性

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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.
机译：本文中，我们报道了类似于35 nm的Mg-纳米颗粒的非凡的热稳定性，后者构成了Ti2AlC-Mg复合材料的基质，先前已显示其具有出色的机械性能。微观结构非常稳定，以至于将复合材料加热至700摄氏度（高于Mg熔点的50摄氏度）三遍，这不仅导致Mg的重复熔化，而且出乎意料地且在我们的差示扫描量热仪的分辨率范围内，没有导致任何变粗。由于纳米颗粒导致的Mg熔点降低类似于50摄氏度。X射线衍射和中子光谱结果表明，薄的，无定形的和/或结晶不良的金红石，锐钛矿和/或氧化镁层将Mg纳米颗粒分开并防止它们变粗。显然，该层足够薄，因此具有足够的机械强度，可以承受循环过程中遇到的熔化和凝固应力。在250摄氏度的氢气中退火20小时，似乎也没有明显改变晶粒尺寸。

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