Stir casting process for manufacture of Al-SiC composites

• 作 者: Shahin Soltani Rasoul Azari Khosroshahi Reza Taherzadeh Mousavian Zheng-Yi Jiang Alireza Fadavi Boostani Dermot Brabazon
• 机 构: Faculty of Materials Engineering,Sahand University of Technology,School of Mechanical,Materials and
• 出 处: Rare Metals
• 发表日期: 2017年07期
• 关键词: Aluminum matrix composite Microstructure Mechanical properties Stir casting

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 composites.In this study,micron-sized SiC particles were used as reinforcement to fabricate Al-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 agglomeration of the particles were evaluated by scanning electron microscope(SEM) and high-resolution transition electron microscope(HRTEM) studies.From microstructural characterizations,it is concluded that the shorter stirring period is required for ceramic incorporation to achieve metal/ceramic bonding at the interface.The higher stirring temperature(850 ℃) also leads to improved ceramic incorporation.In some cases,shrinkage porosity and intensive formation of Al_4C_3 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.

Stir casting is an economical process for the fabrication of aluminum matrix composites. Here are many parameters in this process, which affect the final microstructure and mechanical properties of the composites. In this study, micron-sized SiC particles were used as a reinforcement to fabricate Al -3 wt% SiC composites at two casting temperatures (680 and 850 ° C.) and stirring periods (2 and 6 min). Factors of reaction at matrix / ceramic interface, porosity, ceramic incorporation, and agglomeration of the particles were evaluated by scanning electron microscope (SEM) and high-resolution transition electron microscope (HRTEM) studies. Ferrom microstructural characterizations, it is concluded that the stirring period is required for ceramic incorporation to achieve metal / ceramic bonding at the interface. ) also leads to improved ceramic incorporation. In some cases, shrinkage porosity and intensive formation of Al_4C_3 at the metal / ceramic interface are also ob served.Finally, the mechanical properties of the composites were evaluated, and their relation with the corresponding microstructure and processing parameters of the composites was discussed.