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Optimization of Machining Characteristics for al/sicp composites using ANN/GA

Journal of Materials Science & Technology 2002年第1期18卷 47-50页

作者： R.Karthikeyan B.C.Pai 等 DepartmentofProductionEngineering AnnamalaiUniversityAnnamalainagar-608002India RegionalResearchLaboratory ThiruvananthapuramIndia

The present work is focused on the optimization of machining characteristics of al/sicp composites. The machining characteristics such as specific energy, tool wear and surface roughness were studied. The parameters such as volume fraction of SiC, cutting speed and feed rate were considered. Artificial neural network (ANN) was used to train and simulate the experimental data. Genetic algorithm (GA) was interfaced with ANN to optimize the machining conditions for the desired machining characteristics. The validation of optimized results was also performed by confirmation experiments.

关键词： al/sicp composites Artificial neural networks Genetic algorithms

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Evolution of Thermoplastic Shear Localization and Related Microstructures in al/SiC_p composites Under Dynamic Compression

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Journal of Materials Science & Technology 2002年第6期18卷 504-508页

作者： YongboXU ZhongLING 等 ShenyangNationalLaboatoryandMaterialsScience InstituteofMetalResearchChineseAcademyofSciencesShenyang110016China LaboratoryforNon-LinearMechanicsofContinuousMedia InstituteofMe

The localized shear deformation in the 2024 and 2124 al matrix composites reinforced with SiC particles was investigated with a split Hopkinson pressure bar (SHPB) at a strain rate of about 2.0×103 s-1. The results showed that the occurrence of localized shear deformation is sensitive to the size of SiC particles. It was found that the critical strain, at which the shear localization occurs, strongly depends on the size and volume fraction of SiC particles. The smaller the particle size, the lower the critical strain required for the shear localization. TEM examinations revealed that al/sicp interfaces are the main sources of dislocations. The dislocation density near the interface was found to be high and it decreases with the distance from the particles. The al matrix in shear bands was highly deformed and severely elongated at low angle boundaries. The AI/sicp interfaces, particularly the sharp corners of SiC particles, provide the sites for microcrack initiation. Eventual fracture is caused by the growth and coalescence of microcracks along the shear bands. It is proposed that the distortion free equiaxed grains with low dislocation density observed in the center of shear band result from recrystallization during dynamic deformation.

关键词： al/sicp composites Shear localization Recrystallization Dislocations

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