An effective strategy to inhibit grain coarsening:Construction of multi-element co-segregated grain boundary complexion  

作　　者：Le Fu Gabriel Arcuri Wenjun Yu Bohan Wang Zihua Lei Ying Deng Kathryn Grandfield 

机构地区：[1]School of Material Science and Engineering,Central South University,Changsha 410083,China [2]Canadian Centre for Electron Microscopy,McMaster University,Hamilton L8S 4L8,Canada [3]State Key Laboratory of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China [4]Department of Materials Science and Engineering,McMaster University,Hamilton L8S 4L8,Canada

出　　处：《Journal of Advanced Ceramics》2024年第7期1060-1071,共12页先进陶瓷（英文）

基　　金：the financial support of the National Natural Science Foundation of China(No.52102084);the Natural Science Foundation of Hunan Province(No.2022JJ30718);Kathryn Grandfield acknowledges funding from the Natural Sciences and Engineering Research Council of Canada(NSERC)discovery grant and research chair programs.

摘　　要：When exposed to moderate to high temperatures,nanomaterials typically suffer from severe grain coarsening,which has long been a major concern that prevents their wider applications.Here,we proposed an effective strategy to inhibit grain coarsening by constructing grain boundary(GB)complexions with multiple codoped dopants,which hindered coarsening from both energetic and kinetic perspectives.To demonstrate the feasibility of this strategy,multiple selected dopants were doped into a ZrO_(2)-SiO_(2)nanocrystalline glass ceramic(NCGC)to form GB complexions.The results showed that NCGC was predominantly composed of ZrO_(2)nanocrystallites(NCs)distributed in an amorphous SiO_(2)matrix.Ultrathin layers of GB complexions(~2.5 nm)were formed between adjacent ZrO_(2)NCs,and they were crystalline superstructures with co-segregated dopants.In addition,a small amount of quartz solid solution was formed,and it adhered to the periphery of ZrO_(2)NCs and bridged the adjacent NCs,acting as a“bridging phase”.The GB complexions and the“bridging phase”synergistically enhanced the coarsening resistance of ZrO_(2)NCs up to 1000°C.These findings are important for understanding GB complexions and are expected to provide new insights into the design of nanomaterials with excellent thermodynamic stability.

关 键 词：Zr_(2)-Si_(2) multi-element co-segregation grain boundary(GB)complexion grain coarsening atom probe tomography(APT) 

分 类 号：TQ174.758.11[化学工程—陶瓷工业]