Clarification and Functionalization of Micro -and Mezzo structure near Boundary between Different Phase in Single-crystalline Super Metals

单晶超级金属异相边界附近微观和中层结构的澄清和功能化

• 批准号: 11450044
• 负责人: TOMITA Yoshihiro
• 金额: $ 5.63万
• 依托单位: Kobe University
• 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 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450044/
• 关键词: Nickel-base Superalloy; Mezoscopic Structure; Control of Material Structure; High-performance Materials; Computational Simulation; γ' Phase Preticipate; Homogenization Methods; Morphology-dependent Mechanical Characteristics; γ'相析出; 金属間化合物; ニッケル

In order to obtain the high performance material through the control of the microstructure of the materials the computational strategies to relate the microstructure and its evolution due to macroscopic deformation has been generalized to adopt the present problems. Subsequently, the methods have been applied to the problems associated with the evaluation of the macroscopic characteristic feature of the material with microstructures. The followings are the main results.(1) Subdivisions Method employing the eigen strain fields has been modified to obtain an accurate solution and the method has been used to evaluate the overall properties of short fiber reinforced composites and clarified the proper arrangement of reinforcement to realize the desired characteristic feature of the composite.(2) With a computational model employing the strain gradient constitutive equation for plastic deformation of the matrix material and a homogenization method, the effects of the volume fraction, size and distribution pattern of reinforced particles and direction of particle distribution with respect to applied stress on the macroscopic characteristic feature of the composites were clarified. The main mechanism of the increase of the deformation resistance in the plastic range is the high strain gradient in the matrix material, which increases with decreasing distance between the particles. These all suggest the way of an enhancement of resistance of the deformation behavior.(3) A three dimensional homogenization method employing the constitutive equation based on the crystal plasticity theory has been developed and the effect of the volume fraction of γ´ phase and the difference of crystalline directions of γ'/γ phases on the characteristic feature of the alloy. It is significantly affected by the strain distribution due to the inhomogeneous deformation induced by the γ´ phase precipitation on a microscopic scale

为了通过对材料微观组织的控制来获得高性能材料，针对目前存在的问题，总结了宏观变形过程中微观组织及其演化的计算策略。随后，这些方法被应用于评价具有微观结构的材料的宏观特征的相关问题。主要研究结果如下：(1)对基于特征应变场的细分方法进行了改进，得到了精确的解，并将该方法用于评价短纤维增强复合材料的整体性能，明确了增强体的合理布置，以实现复合材料所需的特征特征。(2)采用基于复合材料塑性变形的应变梯度本构方程的计算模型和均匀化方法，阐明了增强体的体积分数、颗粒的尺寸和分布方式以及颗粒分布方向对复合材料宏观特性的影响。塑性区变形抗力提高的主要机制是母材中的高应变梯度，这种应变梯度随着颗粒间距的减小而增大。建立了基于晶体塑性理论本构方程的三维均匀化方法，研究了γ‘相的体积分数和γ’/γ相的晶向差异对合金特性的影响。在微观尺度上，受γ相析出引起的不均匀变形引起的应变分布的影响很大

项目成果

Yoshihiro Tomita: "Modeling and Estimation of Deformation Behavior of Particle Reinforced Metal-Matrix Composite"Int.J.Mech.Sci.. 42・11. 2249-2260 (2000)

富田义博：“颗粒增强金属基复合材料变形行为的建模和估计”Int.J.Mech.Sci.. 2249-2260 (2000)。

Xi Yuan: "A non-local model of materials with microstructure based on asymptotic homogenization method"MSR International. (In press). (2001)

席媛：“一种基于渐进均质化方法的微结构材料非局域模型”MSR International。

Xi Yuan Yoshihiro Tomita: "A non-local model of materials with microstructure based on asymptotic homogenization method"MSR International. (in press). (2001)

西元 Yoshihiro Tomita：“基于渐近均质化方法的具有微观结构的材料的非局域模型”MSR International。

Yoshihiro Tomita, Yoshikazu Higa, Takehiro Fujimoto: "Modeling and Estimation of Deformation Behavior of Particle Reinforced Metal-Matrix Composite"Int.J.Mech.Sci.. 42-11. 2249-2260 (2000)

Yoshihiro Tomita、Yoshikazu Higa、Takehiro Fujimoto：“颗粒增强金属基复合材料变形行为的建模和估计”Int.J.Mech.Sci. 42-11。

Yoshikazu Higa: "Computational Modeling of deformation Behavior of Mickel-based Superalloy with Gamma Prime Phase Precipitates"Proc.AEPA2K. (印刷中). (2000)

Yoshikazu Higa：“具有伽马相沉淀的米克尔基高温合金的变形行为的计算模型”Proc.AEPA2K（出版中）。