Grain Boundary Design using Ceramic Multiple Crystals and Plasticity

使用陶瓷多晶体和可塑性的晶界设计

• 批准号: 11450260
• 负责人: IKUHARA Yuichi
• 金额: $ 9.09万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450260/
• 关键词: Multiple Crystal; Alumina; Zirconia; Coincidence Site Lattice Boundary; Grain Boundary Sliding; Stress Accommodation; Creep; Transmission Electron Microscopy; マルチプルクりスタル; バイクリスタル; 高分解能電子顕微鏡法; 高温変形; 粒界性格

In this year, alumina and zirconia multiple crystals were systematically fabricated, and the respective grain boundary structure and chemistry were characterized by high-resolution electron microscopy (HREM), energy dispersive X-ray spectroscopy (EDS) and electron energy loss spectroscopy (EELS).Alumina multiple crystals were fabricated by a hot joining technique at 1500 ℃ in air to obtain ten kinds of tilt grain boundaries which included small angle, CSL and high angle grain boundaries. It was found that grain boundary energy strongly depended on the grain boundary characters, e.g., there were large energy cusps at low Σ CSL grain boundaries. But, main part of grain boundary energy is likely to be due to the strain energy around the grain boundary, and the contribution of atomic configuration is not so large. Small angle grain boundaries were consisted of an array of partial dislocation with Burgers vector of 1/3[1 1^^- 00] to form the stacking faults between the dislocations. The beh … More avior of grain boundary sliding was also investigated for typical grain boundaries by high-temperature creep test at 1400 ℃. As the result, the occurrence of grain boundary sliding was found to depend on the grain boundary geometry and atomic structure.Zirconia multiple crystals were also fabricated by a hot joining technique at 1600 ℃ in air to obtain ten kinds of tilt grain boundaries. It was found that the grain boundary structure and energy strongly depended on the grain boundary characters. For example, Σ9 grain boundary showed particularly high energy because the structure unit is highly strained at the boundary, although the amount of segregated yttrium is very large. In the case of Σ3 boundary, the atomic structure depends on the boundary planes. When boundary plane is (111), the boundary is perfectly straight along the (111) plane, however, facet structure is formed along (111)//(115) planes when the initial boundary plane is set parallel to (112). The relationship between grain boundary characters and energy will be discussed in detail from the view point of atomic structures and segregation for all kinds of grain boundaries in zirconia. Less

今年，系统地制备了氧化铝和氧化锆多晶，并通过高分辨率电子显微镜（HREM）、能量色散X射线光谱（EDS）和电子能量损失谱（EELS）对各自的晶界结构和化学进行了表征。在空气中通过热连接技术在1500℃下制备了氧化铝多晶，获得了十种倾斜晶界，其中包括小 角、CSL 和大角度晶界。研究发现，晶界能量强烈依赖于晶界特征，例如，在低Σ CSL晶界处存在大的能量尖点。但是，晶界能的主要部分很可能是晶界周围的应变能，而原子构型的贡献并不大。小角度晶界由一系列Burgers矢量为1/3[1 1^^- 00]的部分位错组成，在位错之间形成堆垛层错。通过1400 ℃高温蠕变试验，研究了典型晶界的晶界滑动行为。结果发现，晶界滑动的发生取决于晶界几何形状和原子结构。还通过在空气中1600℃的热连接技术制备了氧化锆多晶，获得了10种倾斜晶界。研究发现，晶界结构和能量强烈依赖于晶界特征。例如，Σ9晶界表现出特别高的能量，因为结构单元在晶界处高度应变，尽管偏析的钇量非常大。在 Σ3 边界的情况下，原子结构取决于边界面。当边界面为(111)时，边界沿(111)面完全笔直，然而，当初始边界面设置为平行于(112)时，沿(111)//(115)面形成小平面结构。从氧化锆各种晶界的原子结构和偏析角度，详细讨论晶界特征与能量的关系。较少的

项目成果

Y.Ikuhara: "Grain Boundary and Interface Structures in Ceramics"J. Ceram. Soc. Jap.. Vol.109. S110-S120 (2001)

Y.Ikuhara：“陶瓷中的晶界和界面结构”J。

N.Shibata., T.Yamamoto., Y.Ikuhara and T.Sakuma: "Structure of [110] tilt grain boundaries in zirconia bicrystals"J. Electro. Microsopy. Vol.50. 429-433 (2001)

N.Shibata.，T.Yamamoto.，Y.Ikuhara 和 T.Sakuma：“氧化锆双晶中[110]倾斜晶界的结构”J。

Y.Ikuhara,T.Watanabe,T.Saito,H.Yoshida and T.Sakuma: ""Atomic Structure and Chemical Bonding State of Sapphire Bicrystals""Mater.Sci.Forum. vol.294-296. 273-276 (1999)

Y.Ikuhara、T.Watanabe、T.Saito、H.Yoshida 和 T.Sakuma：“蓝宝石双晶的原子结构和化学键状态”Mater.Sci.Forum。

幾原雄一: "セラミック材料の物理"日刊工業新聞社. 343 (1999)

几原雄一：《陶瓷材料物理学》日刊工业新闻社 343（1999）。

Y.Ikuhara.,T.Watanabe.,T.Yamamoto.,T.Saito.,H.Yoshida and T.Sakuma: ""Grain Boundary Structure and Sliding of Alumina Bicrystals""Proc.Mater.Res.Soc.. vol.601. 125-132 (2000)

Y.Ikuhara.、T.Watanabe.、T.Yamamoto.、T.Saito.、H.Yoshida 和 T.Sakuma：““氧化铝双晶的晶界结构和滑动””Proc.Mater.Res.Soc.. vol