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稳定纳米晶合金的设计-------最新Science
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Nanostructured metals are generally unstable; their grains grow rapidly even at low temperatures, rendering them difficult to process and often unsuitable for usage. Alloying has been found to improve stability, but only in a few empirically discovered systems. We have developed a theoretical framework with which stable nanostructured alloys can be designed. A nanostructure stability map based on a thermodynamic model is applied to design stable nanostructured tungsten alloys. We identify a candidate alloy, W-Ti, and demonstrate substantially enhanced stability for the high-temperature, long-duration conditions amenable to powder-route production of bulk nanostructured tungsten. This nanostructured alloy adopts a heterogeneous chemical distribution that is anticipated by the present theoretical framework but unexpected on the basis of conventional bulk thermodynamics. |
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2012-08-24 12:56:39, 1.15 M
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简单回复
2012-08-24 16:33
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五星好评 顶一下，感谢分享！
rockkos3楼
2012-08-24 17:05
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五星好评 顶一下，感谢分享！
wmnick4楼
2018-05-02 20:56
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五星好评 顶一下，感谢分享！