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DESIGN,PROCESSING AND EVALUATION OF FUNCTIONALLY GRADIENT MATERIALS BY MEANS OF CENTRIFUGAL CASTING METHOD

离心铸造法功能梯度材料的设计、加工与评价

基本信息

批准号：
07555348
负责人：
INOUE Tatsuo
金额：
$ 1.34万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

When the centrifugal casting method is employed in the production process of metal matrix composite, it is possible to control the distribution of reinforcement in radial direction. The present research project is intended to clarify the effect of casting conditions on the mechanical properties of the metal matrix composite from both experimental and theoretical points of view. The following results are obtained through the project.1.Experimental results : A metal matrix composite, which is composed of Al-alloy as the matrix and SiC-particles as the reinforcement, is produced by means of a centrifugal casting apparatus. The matrix is too rapidly solidified around the casting mold and so the reinforcement is not sufficiently distributed over the thickness, although the volume fraction of the reinforcement in general increases with radius. This can be improved by heating the surrounding mold. The casting pressure due to centrifugal force strengthens the bonding resistance between the matrix and reinforcement. Therefore the casting conditions, such as the casting speed as well as the mold temperature, have a predominant influence on the mechanical property of the products.2.Numerical results : A numerical simulation is carried out in order to evaluate both the distribution of reinforcement and the residual stresses, based on the finite element method. The simulated results of the SiC-particle distribution show good agreement with the experimental data. And higher casting speed is needed in order to obtain a final product with highly gradient content of the reinforcement. It is shown that larger residual stress is induced through the processing when including higher volume fraction of the reinforcement in the metal matrix composite.

采用离心铸造法生产金属基复合材料时，可以控制增强体在径向的分布。本研究旨在从实验和理论两个角度阐明铸造条件对金属基复合材料力学性能的影响。1.实验结果：采用离心铸造法制备了以Al合金为基体，SiC颗粒为增强体的金属基复合材料。基体在铸模周围凝固得太快，因此增强体在厚度上没有充分分布，尽管增强体的体积分数通常随半径增加。这可以通过加热周围的模具来改善。离心力产生的铸造压力增强了基体与增强体之间的粘结阻力。因此，铸造条件，如铸造速度以及模具温度，对制品的力学性能有着显著的影响。2.数值结果：基于有限元方法，对增强体和残余应力的分布进行了数值模拟。SiC颗粒分布的模拟结果与实验数据吻合较好。并且需要更高的铸造速度以获得具有高梯度含量的增强体的最终产品。结果表明，当金属基复合材料中包含更高体积分数的增强体时，通过加工诱导更大的残余应力。