期刊
JOURNAL OF MATERIALS SCIENCE
卷 56, 期 26, 页码 14611-14623出版社
SPRINGER
DOI: 10.1007/s10853-021-06224-2
关键词
-
资金
- Department of Energy (DOE) [DE-EE0009116]
- University of New Mexico
Nanocrystalline metals can be stabilized by introducing preferential dopants to enhance the stability of the material's microstructure. Magnesium, lanthanum, and silicon are identified as effective dopant elements capable of promoting thermodynamic stability in aluminum's nanocrystalline regime.
Nanocrystalline metals are generally unstable due to a large volume fraction of high-energy grain boundaries associated with a small grain size. Preferential dopant segregation to the high-energy grain boundaries is observed to enhance the stability of the material's microstructure by minimizing its energy. Nanocrystalline aluminum-dopant systems were evaluated for thermodynamic stability against grain growth and phase precipitation via the mechanism of grain boundary segregation according to a modified regular nanocrystalline solution model. Fifty-one potential dopant elements have been evaluated for their efficacy in stabilizing nanostructures with three potential candidates, magnesium, lanthanum, and silicon, identified possessing the characteristics to promote grain boundary segregation and a state of thermodynamic stability in aluminum's nanocrystalline regime. The minimum dopant content required to achieve nanocrystalline microstructure stability is identified for each of the three candidate elements. Beyond this minimum content, further addition of the dopant elements decreased the final microstructure's stability with no effects on the existence of a stable nanocrystalline state.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据