Role of Local Microstructure Parameters in the Evolution Process of Interfacial Microstructures of Joints

局部微观结构参数在接头界面微观结构演化过程中的作用

• 批准号: 13450295
• 负责人: SHIBAYANAGI Toshiya
• 金额: $ 3.78万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450295/
• 关键词: EBSP method; microstructure; friction stir welding; solid state diffusion bonding; Monte Carlo simulation; grain growth; interfacial reaction; grain boundary migration; 5083アルミニウム合金; 結晶粒微細化; EBSP解析; 異常粒成長; 超塑性変形; 硬さ; 残留ひずみ; モンテカルロシミュレーション /

This project aims to characterize microstructure of joint regions focusing on the role of microstructural parameters such as phases, shape and size of grains, grain orientations and grain boundary structures. Electron Back-Scattering Pattern analysis was utilized to characterize microstructures of Aluminum alloy joint fabricated by friction stir welding(FSW). 111 oriented grains tended to exist almost parallel to the rotating tool, indicating a heavy shear deformation is taking place around the rotating pin during FSW. This texture component is different from those appeared in Al alloys fabricated by conventional processing such as rolling, extrusion and so on. The microstructure of FSW joints is unstable at elevated temperature, showing an abnormal grain growth. FSW can produce peculiar microstructure in a localized region but the microstructure has some important information to be acting as a trigger effect of abnormal grain growth.A Monte Carlo simulation based on Potts model was pe … More rformed to elucidate the role of local microstructure parameters in grain growth process of single and dual phase structures under uniform or heterogeneous temperature fields. Some new algorithms were established in the present research. Grain boundary migration, which is an essential and fundamental process for the grain growth, was strongly affected by second phase or temperature gradient. Retardation of grain growth was observed in the region where second phase particles exist or temperature was lower than the other area. Preferential grain growth such as abnormal grain growth was taking place when a steep temperature field was applied in a localized area. This result gave us a new idea for microstructure control, that is spot heating techniques for coding microstructure information into polycrystalline materials.Solid-state diffusion bonding of ceramics to metals was performed concerning the interfacial reaction. A concept of chemical potential diagram was utilized for describing phase sequence in the interfaces between silicon nitride and metals such as vanadium, niobium, titanium and titanium aluminide, and so on.The present project focused on the interfacial microstructures that show wide variety depending on the spatial distributions of microstructure parameters. Based on the findings of the present study, it should be noted that we can control local microstructure utilizing heterogeneous field of strain, temperature and compositions. Less

该项目旨在表征接头的微观结构，重点关注微观结构参数的作用，例如相、晶粒的形状和尺寸、晶粒取向和晶界结构，利用电子背散射图案分析来表征摩擦制造的铝合金接头的微观结构。搅拌焊接（FSW）。111 取向晶粒几乎平行于旋转工具存在，表明在 FSW 过程中旋转销周围发生了严重的剪切变形。这些现象出现在通过轧制、挤压等常规加工制造的铝合金中，FSW接头的显微组织在高温下不稳定，表现出异常的晶粒生长，在局部区域产生特殊的显微组织，但该显微组织具有一些重要的特征。信息作为异常晶粒生长的触发效应。基于Potts模型的蒙特卡罗模拟阐明了局部微观结构参数在均匀或双相结构晶粒生长过程中的作用。本研究建立了一些新的算法，晶界迁移是晶粒生长的一个重要且基本的过程，在该区域观察到晶粒生长的延迟。当局部区域施加陡峭的温度场时，会出现第二相颗粒的存在或温度低于其他区域的晶粒优先生长，例如异常晶粒生长，这一结果为我们提供了微观组织控制的新思路。将微观结构信息编码成的加热技术陶瓷与金属的固态扩散结合涉及界面反应，利用化学势图的概念来描述氮化硅与钒、铌、钛和铝化钛等金属之间界面的相序。本项目重点研究界面微观结构，根据微观结构参数的空间分布，界面微观结构表现出多种变化。值得注意的是，我们可以利用应变、温度和成分的异质场来控制局部微观结构。

项目成果

Solid-State Diffusion Bonding of Silicon Nitride Using Titanium Foils

使用钛箔进行氮化硅的固态扩散接合

• 发表时间: 2003
• 期刊: Metallurgical and Materials Transactions A 34
• 作者: M.Maeda;柴柳敏哉;Y.Takayama;T.Shibayanagi;M.Maeda;K.Tenyama;T.Shibayanagi;T.Shibayanagi;K.Tenyama;T.Shibayanagi;柴柳敏哉;T.Shibayanagi;M.Maeda;K.Tenyama;T.Shibayanagi;Y.Takayama;柴柳敏哉;M.Maeda;M.Maeda
• 通讯作者: M.Maeda

Microstructure Analysis Utilizing EBSP method

利用 EBSP 方法进行微观结构分析

• 发表时间: 2003
• 期刊: J.High Temperature Society 29 No.4
• 作者: M.Maeda;柴柳敏哉;Y.Takayama;T.Shibayanagi;M.Maeda;K.Tenyama;T.Shibayanagi;T.Shibayanagi;K.Tenyama;T.Shibayanagi;柴柳敏哉;T.Shibayanagi;M.Maeda;K.Tenyama;T.Shibayanagi;Y.Takayama;柴柳敏哉;M.Maeda;M.Maeda;T.Shibayanagi;T.Shibayanagi;T.Shibayanagi;T.Shibayanagi
• 通讯作者: T.Shibayanagi

Solid State Diffusion Bonding of SiC to Nb

SiC 与 Nb 的固态扩散连接

• 发表时间: 2002
• 期刊: Proceedings of "Designing of Interfacial Structures in Advanced Materials and Their Joints" 26-28 Nov.2002, Osaka, Japan
• 作者: M.Maeda;柴柳敏哉;Y.Takayama;T.Shibayanagi;M.Maeda;K.Tenyama;T.Shibayanagi;T.Shibayanagi;K.Tenyama;T.Shibayanagi;柴柳敏哉;T.Shibayanagi;M.Maeda;K.Tenyama;T.Shibayanagi;Y.Takayama;柴柳敏哉;M.Maeda;M.Maeda;T.Shibayanagi;T.Shibayanagi;T.Shibayanagi;T.Shibayanagi;M.Maeda;M.Maeda;T.Shibayanagi;M.Mori;M.Mori;A.Inoue;M.Maeda
• 通讯作者: M.Maeda

T.Shibayanagi, M.Maeda: "Grain growth simulation of two phase structure under temperature gradient"Transactions of JWRI. 31・2. (2003)

T.Shibayanagi、M.Maeda：“温度梯度下两相结构的晶粒生长模拟”JWRI 汇刊 31・2。

「研究成果報告書概要(欧文)」より

摘自《研究结果报告摘要（欧洲）》

• 发表时间: 2006
• 期刊: Seibutsu Butsuri 46(1)
• 作者: Yasushi Shigeri;Keiko Shimamoto
• 通讯作者: Keiko Shimamoto