晶界
蠕动
钇
材料科学
杂质
兴奋剂
原子单位
变形(气象学)
晶界滑移
晶界强化
冶金
化学物理
复合材料
凝聚态物理
微观结构
化学
光电子学
氧化物
有机化学
物理
量子力学
作者
J. P. Buban,K Matsunaga,J. Chen,Naoya Shibata,W. Y. Ching,Takahisa Yamamoto,Yuichi Ikuhara
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2006-01-13
卷期号:311 (5758): 212-215
被引量:394
标识
DOI:10.1126/science.1119839
摘要
Impurity doping often alters or improves the properties of materials. In alumina, grain boundaries play a key role in deformation mechanisms, particularly in the phenomenon of grain boundary sliding during creep at high temperatures. We elucidated the atomic-scale structure in alumina grain boundaries and its relationship to the suppression of creep upon doping with yttrium by using atomic resolution microscopy and high-precision calculations. We find that the yttrium segregates to very localized regions along the grain boundary and alters the local bonding environment, thereby strengthening the boundary against mechanical creep.
科研通智能强力驱动
Strongly Powered by AbleSci AI