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Empirical model to predict mass gain of cobalt electroless deposition on ceramic particles using response surface methodology

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Rare Metals 2017年第3期36卷 209-219页

作者： Akbar Heidarzadeh Reza Taherzadeh Mousavian rasoul azari khosroshahi Yalda A.Afkham Hesam Pouraliakbar Faculty of Engineering Azarbaijan Shahid Madani UniversityTabriz 7200-000Iran Department of Materials Engineering Sahand University of TechnologyTabriz 65175-4171Iran Department of Advanced Materials WorldTech Scientific Research Center(WT-SRC)Tehran 71857-3834Iran

This investigation was undertaken to predict the mass gain （MG） of cobalt electroless deposition （ED） on ceramic SiC *** surface methodology （RSM） based on a full factorial design with three ED parameters and 30 runs was used to conduct the experiments and to establish a mathematical model by means of Design-Expert *** ED parameters considered were pH,bath temperature and ceramic particle *** of variance was applied to validate the predicted *** results of confirmation analysis by scanning electron microscopy （SEM） show that the developed models are reasonably *** pH is the most effective parameter for the ***,the highest mass gain is obtained for the lowest pH,highest bath temperatures and heat-treated SiC *** addition,the developed model shows that the optimal parameters to get a maximum value of mass gain are pH,bath temperature and ceramic particle state of 8,70 ℃ and heat treatment,respectively.

关键词： Electroless deposition Cobalt SiC particles Mathematical model Response surface method

Stir casting process for manufacture of Al-SiC composites

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Rare Metals 2017年第7期36卷 581-590页

作者： Shahin Soltani rasoul azari khosroshahi Reza Taherzadeh Mousavian Zheng-Yi Jiang Alireza Fadavi Boostani Dermot Brabazon Faculty of Materials Engineering Sahand University ofTechnologyTabriz 37200-000Iran School of Mechanical Materials and Mechatronic EngineeringUniversity of WollongongWollongongNSW 2522Australia Advanced Processing Technology Research Centre School of Mechanical and Manufacturing EngineeringDublin CityUniversityDublin 9Ireland

Stir casting is an economical process for the fabrication of aluminum matrix composites. There are many parameters in this process, which affect the final microstructure and mechanical properties of the compos- ites. In this study, micron-sized SiC particles were used as reinforcement to fabricate A1-3 wt% SiC composites at two casting temperatures （680 and 850 ℃） and stirring periods （2 and 6 min）. Factors of reaction at matrix/ceramic interface, porosity, ceramic incorporation, and agglomera- tion of the particles were evaluated by scanning electron microscope （SEM） and high-resolution transition electron microscope （HRTEM） studies. From microstructural char- acterizations, it is concluded that the shorter stirring period is required for ceramic incorporation to achieve metal/ce- ramic bonding at the interface. The higher stirring tem- perature （850 ℃） also leads to improved ceramic incorporation. In some cases, shrinkage porosity and intensive formation of A14C3 at the metal/ceramic interface are also observed. Finally, the mechanical properties of the composites were evaluated, and their relation with the corresponding microstructure and processing parameters of the composites was discussed.

关键词： Aluminum matrix composite Microstructure Mechanical properties Stir casting

Microstructural and mechanical properties of Al-4.5wt% Cu reinforced with alumina nanoparticles by stir casting method

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International Journal of Minerals,Metallurgy and Materials 2013年第10期20卷 978-985页

作者： N.Valibeygloo R.azari khosroshahi R.Taherzadeh Mousavian Faculty of Materials Engineering Sahand University of Technology Department of Metallurgy Zanjan BranchIslamic Azad University

The microstructure and mechanical properties of A1-4.5wt% Cu Mloy reinforced with different volume fractions （1.5vo1%, 3vo1%, and 5vo1%） of alumina nanoparticles, fabricated using stir casting method, were investigated. CMculated amounts of alumina nanoparticles （about ~50 nm in size） were ball-milled with aluminum powders in a planetary ball mill for 5 h, and then the packets of milled powders were incorporated into molten Al-4.5wt% Cu alloy. Microstructural studies of the nanocomposites reveal a uniform distribution of alumina nanoparticles in the A1-4.5wt% Cu matrix. The results indicate an outstanding improvement in compression strength and hardness due to the effect of nanoparticle addition. The aging behavior of the composite is also evaluated, indicating that the addition of alumina nanoparticles can accelerate the aging process of the Mloy, resulting in higher peak hardness values.

关键词： metallic matrix composites nanocomposites aluminum alumina nanoparticles casting mechanical proper-ties microstructure