Suppressing atomic diffusion with the Schwarz crystal structure in supersaturated Al–Mg alloys

doi:10.1126/science.abh0700

GSTDTAP > 气候变化

DOI	10.1126/science.abh0700
	Suppressing atomic diffusion with the Schwarz crystal structure in supersaturated Al–Mg alloys
	W. Xu; B. Zhang; X. Y. Li; K. Lu
	2021-08-06
发表期刊	Science
出版年	2021
英文摘要	Because of atomic diffusion, metal alloys with nanometer-sized crystal grains do not retain their structure at high temperature. Xu et al. found that a minimum-interface structure allows a supersaturated aluminum-magnesium alloy to be retained at temperatures higher than the melting point. This system is known for high atomic diffusivity, highlighting the importance of the underlying interface structure. These observations have implications for designing structural alloys for high-temperature applications. Science , abh0700, this issue p. [683][1] High atomic diffusivity in metals enables substantial tuneability of their structure and properties by tailoring the diffusional processes, but this causes their customized properties to be unstable at elevated temperatures. Eliminating diffusive interfaces by fabricating single crystals or heavily alloying helps to address this issue but does not inhibit atomic diffusion at high homologous temperatures. We discovered that the Schwarz crystal structure was effective at suppressing atomic diffusion in a supersaturated aluminum–magnesium alloy with extremely fine grains. By forming these stable structures, diffusion-controlled intermetallic precipitation from the nanosized grains and their coarsening were inhibited up to the equilibrium melting temperature, around which the apparent across-boundary diffusivity was reduced by about seven orders of magnitude. Developing advanced engineering alloys using the Schwarz crystal structure may lead to useful properties for high-temperature applications. [1]: /lookup/doi/10.1126/science.abh0700
领域	气候变化 ; 资源环境
URL	查看原文
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/335580
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	W. Xu,B. Zhang,X. Y. Li,等. Suppressing atomic diffusion with the Schwarz crystal structure in supersaturated Al–Mg alloys[J]. Science,2021.
APA	W. Xu,B. Zhang,X. Y. Li,&K. Lu.(2021).Suppressing atomic diffusion with the Schwarz crystal structure in supersaturated Al–Mg alloys.Science.
MLA	W. Xu,et al."Suppressing atomic diffusion with the Schwarz crystal structure in supersaturated Al–Mg alloys".Science (2021).