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Suppressing atomic diffusion with the Schwarz crystal structure in supersaturated Al–Mg alloys
Science ( IF 56.9 ) Pub Date : 2021-08-06 , DOI: 10.1126/science.abh0700
W Xu 1 , B Zhang 1 , X Y Li 1 , K Lu 1
Affiliation  

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.



中文翻译:

用 Schwarz 晶体结构抑制过饱和 Al-Mg 合金中的原子扩散

通过调整扩散过程,金属中的高原子扩散率能够对其结构和特性进行实质性的调整,但这会导致它们的定制特性在高温下不稳定。通过制造单晶或重合金化来消除扩散界面有助于解决这个问题,但不会抑制高同源温度下的原子扩散。我们发现施瓦茨晶体结构可有效抑制具有极细晶粒的过饱和铝镁合金中的原子扩散。通过形成这些稳定的结构,纳米尺寸晶粒的扩散控制金属间化合物析出及其粗化被抑制到平衡熔化温度,在其周围,明显的跨边界扩散率降低了大约七个数量级。使用 Schwarz 晶体结构开发先进的工程合金可能会为高温应用带来有用的特性。

更新日期:2021-08-05
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