Study on deformation and fracture behavior of tuicrystals and its application to design of grain boundaries in polycrystals

多晶变形断裂行为研究及其在多晶晶界设计中的应用

• 批准号: 03402045
• 负责人: MIURA Sei
• 金额: $ 10.56万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (A)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03402045/
• 关键词: Triple Line; Bicrystal; Tricrystal; Grain Boundary; Interphase Boundary; Creep; Fatigue; Intergranular Fracture; 二相ステンレス鋼; 異相界面; 界面すべり; 粒界疲労; 粒界構造; 粒界会合部; 対応格子; 粒界すべり; 中間温度ぜひ性; 高温変形; 粒界三重線; 三重線fold; すべり帯; 変形帯; 応力伝達係数; 不均一変形

The purpose of this project is to understand the structures of grain boundaries and boundary nodes (triple lines) necessary for strengthening of polycrystals. To achieve the purpose, we have studied roles of a grain boundary and a triple line in deformation and fracture from experiments employing tricrystals. Mains results obtained are summarized as follows.1. We have grown single, bi-and tri-crystals of metals and alloys, and studied deformation and fracture behavior of the crystals by tensile, creep and fatigue tests. Localized deformation and formation and propagation of cracks at and around the grain boundaries and triple lines have been quantitatively and systematically studied including the effects of orientations of the grain boundaries and triple lines. We have revealed contribution of the triple lines to deformation and fracture and its temperature dependence, and presented the structures of grain boundaries and triple lines necessary for the strengthening of materials.2. We have adopted tricrystals consisting of so called special boundaries as main specimens. The same triple lines with the triple lines in the tricrystals have been found in recrystallized copper bicrystals. We have shown the application of the results obtained using the tricrystals to the discussion of mechanical properties of polycrystals.3. Considering the importance of multi-phase materials as practical structural materials, effects of intrphase boundaries on mechanical properties have been studied. We have (gamma/alpha) stainess bicrystals by diffusion bonding and investigated the constraint of grain deformation and the superplastic flow at the interphase boundaries.

本项目的目的是了解强化多晶体所必需的晶界和边界节点（三线）的结构。为了实现这一目的，我们研究了晶界和三线在变形和断裂中的作用，从实验使用三晶体。获得的主要结果总结如下。我们生长了金属和合金的单晶、双晶和三晶，并通过拉伸、蠕变和疲劳试验研究了晶体的变形和断裂行为。定量和系统地研究了晶界和三线及其周围的局部变形和裂纹的形成与扩展，包括晶界和三线取向的影响。揭示了三线对变形和断裂的贡献及其温度依赖性，提出了材料强化所必需的晶界和三线结构.我们采用由所谓的特殊边界组成的三晶体作为主要样品。在再结晶铜双晶中发现了与三晶中的三线相同的三线。我们已经展示了使用三晶体所获得的结果在多晶体力学性质讨论中的应用。考虑到多相材料作为实用结构材料的重要性，研究了相内边界对力学性能的影响。通过扩散连接获得了稳定的（γ/α）双晶，并研究了晶界对晶粒变形的约束和超塑性流动。

项目成果

橋本 敏: "相界面のバイクリスタル研究-二相(γ/α)ステンレス鋼双結晶の超塑性界面すべり-" 日本金属学会会報. 31. 116-122 (1992)

Satoshi Hashimoto：“相界面的双晶研究 - 两相 (γ/α) 不锈钢双晶的超塑性界面滑移” 日本金属学会通报 31. 116-122 (1992)。

S.Onaka: "The effect of a boundary node on intergranular fracture of an α-CuAl alloy at intermediate temperatures" Proc.of ICSMA-10. (in press).

S. Onaka：“中间温度下边界节点对 α-CuAl 合金晶间断裂的影响”，ICSMA-10（出版中）。

T.Wada: "Plastic deformation of two-phase(γ/α)stainless steel bicrystals" Proc.of IUMRS-ICAM-93. (印刷中). (1993)

T. Wada：“两相（γ/α）不锈钢双晶的塑性变形”Proc.of IUMRS-ICAM-93（出版中）。

橋本 敏: "相界面のバイクリスタル研究 一二相(γ/α)ステンレス銅双結晶の超塑性界面すべりー" 日本金属学会会報. 31. 116-122 (1992)

Satoshi Hashimoto：“相界面双晶的研究：十二聚体（γ/α）不锈钢铜双晶的超塑性界面滑移”日本金属学会通报31. 116-122（1992）。

S.Hashimoto: "Interphase boundary sliding in two-phase (γ/α)-FeCrNi alloy bicrystals produced by a solid-solid diffusion method" Proc.of Mechanical Behaviour of Materials-VI. 3. 655-660 (1991)

S. Hashimoto：“固-固扩散法生产的两相 (γ/α)-FeCrNi 合金双晶中的相间边界滑动”Proc. 材料机械行为-VI 3. 655-660 (1991)