Experimental investigation on newly developed ultrafine-grained aluminium based nano-composites with improved mechanical properties

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• 作者：Hafeez Ahamed ; ^{hafeez_ahamed@rediffmail.com} ; V. Senthilkumar ^{vskumar@nitt.edu}
• 关键词：C. Mechanical alloying ; E. Mechanical ; G. Fractography
• 刊名：Materials and Design
• 出版年：2012
• 期刊代码：56_02613069
• 类别：ms
• 出版时间：May, 2012
• 卷：37
• 期：Complete
• 页码：182-192
• 文件大小：2233 K

摘要

The present work describes the structural evolution associated with grain refinement and superior mechanical properties by the addition of nano-size Al₂O₃ and Y₂O₃ particulates into monolithic A16063 alloy matrix. Mechanical milling (MM) and mechanical alloying (MA) was employed to obtain nanostructured A16063 alloy matrix with uniform distribution of ceramic reinforcement particulates. The milled-compacted-sintered samples were hot extruded to further densify the nano-composites and make the distribution of particles uniform in the material. The final hot extruded samples were examined by high resolution-scanning electron microscopy (HR-SEM), field emission-scanning electron microscopy (FESEM), X-ray diffraction (XRD) analysis and were mechanically tested for hardness and mechanical strength. Detailed (transmission electron microscopy) TEM studies were carried out for hybrid reinforced nano-composites which exhibit superior properties over monolithic Al6063 alloy and singular reinforced nano-composites. Results show that the 0.2%yield strength (0.2%YS), ultimate tensile strength (UTS), work of fracture (WOF) were improved over the unreinforced monolithic A16063 alloy and failure strain was decreased in reinforced nano-composites.