Roughening and strain-field evolution at a grain boundary in α-Al2O3

被引：6

作者：

Lee, Sung Bo ^{[1
,2
]}

Lee, Seung-Yong ^{[1
,2
]}

Yoo, Seung Jo ^{[3
]}

Kim, Yoonkoo ^{[1
,2
]}

Kim, Jin-Gyu ^{[3
]}

Kim, Miyoung ^{[1
,2
]}

Han, Heung Nam ^{[1
,2
]}

机构：

[1] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 08826, South Korea

[2] Seoul Natl Univ, RIAM, Seoul 08826, South Korea

[3] KBSI, Electron Microscopy Res Ctr, Daejeon 34133, South Korea

来源：

PHYSICAL REVIEW MATERIALS | 2018年 / 2卷 / 11期

基金：

新加坡国家研究基金会;

关键词：

RADIATION-DAMAGE; TEMPERATURE-DEPENDENCE; CRYSTAL-GROWTH; TRANSITION; SURFACE; MODEL; DISPLACEMENT; MORPHOLOGY; BEHAVIOR; ENERGY;

D O I：

10.1103/PhysRevMaterials.2.113405

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using a combination of high-resolution transmission electron microscopy (HRTEM), geometric phase analysis of HRTEM images, and scanning TEM, we study the structural transition and strain-field evolution at the grain boundary in an alpha-Al2O3 bicrystal with a misorientation relationship of [0 0 0 1]/30 degrees. The specimens are annealed at 300, 500, and 700 degrees C in the TEM. The grain boundaries in the specimens before annealing and annealed at 300 degrees C are observed to be faceted, but the grain boundaries in those annealed at 500 and 700 degrees C become defaceted, exhibiting meandering morphology. Interestingly, for the as-received specimen and that annealed at 300 degrees C, there occurs a periodic strain fluctuation along the grain boundary. However, such a periodic fluctuation along the grain boundary is not observed in the specimens annealed at 500 and 700 degrees C. These results suggest an unexplored possibility that the roughening transition of a grain boundary is enhanced by strain relaxation occurring at the grain boundary.

引用

页数：9

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