当前位置: X-MOL 学术Curr. Opin. Solid State Mater. Sci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Grain boundary complexions in multicomponent alloys: Challenges and opportunities
Current Opinion in Solid State & Materials Science ( IF 11.0 ) Pub Date : 2016-05-06 , DOI: 10.1016/j.cossms.2016.05.001
Naixie Zhou , Tao Hu , Jian Luo

Grain boundaries (GBs) can undergo first-order or continuous phase-like transitions, which are called complexion transitions. Such GB transitions can cause abrupt changes in transport and physical properties, thereby critically influencing sintering, grain growth, creep, embrittlement, electrical/thermal/ionic conductivity, and a broad range of other materials properties. Specifically, the presence of multiple dopants and impurities can significantly alter the GB complexion formation and transition. This article reviews and discusses several GB adsorption (segregation) and prewetting/premelting type complexion models in multicomponent alloys, in which the interactions among multiple adsorbates not only provide a route to control GB properties but also produce novel phenomena. Specifically, various ternary GB diagrams, including both GB adsorption complexion diagrams with well-defined transition lines calculated from a lattice model (without considering interfacial disordering) and GB λ diagrams that predict useful trends for average general GBs to disorder at high temperatures and related sintering phenomena, are constructed to quantitatively describe the GB behaviors as functions of bulk compositions. Finally, we propose a new opportunity of utilizing “high-entropy GB complexions” to stabilize nanocrystalline alloys.



中文翻译:

多组分合金中的晶界肤色:挑战与机遇

晶界(GB)可能经历一阶或连续的类似相的转变,这被称为肤色转变。这种GB跃迁会引起传输和物理性质的突然变化,从而严重影响烧结,晶粒长大,蠕变,脆化,电/热/离子传导率以及其他各种材料的性质。具体地,多种掺杂剂和杂质的存在可以显着改变GB肤色的形成和过渡。本文回顾并讨论了多组分合金中的几种GB吸附(偏析)和预润湿/预熔型络合物模型,其中多种吸附物之间的相互作用不仅提供了控制GB性能的途径,而且还产生了新的现象。具体来说,是各种三元GB图,λ可以预测高温下一般GB的无序化趋势和相关烧结现象的图表,用于定量描述GB行为与整体成分的关系。最后,我们提出了利用“高熵GB肤色”来稳定纳米晶合金的新机会。

更新日期:2016-05-06
down
wechat
bug